How many mL is 1 teaspoon?

1 US teaspoon = 4.92892159375 mL exactly (= 1/3 x 14.78676478125 mL per US tablespoon). FDA OTC labels: 1 teaspoon = 5 mL (rounds up 71 µL from actual 4.929 mL). Australian and metric teaspoon = 5 mL exactly. UK traditional teaspoon = 4.736 mL. Source: NIST Handbook 44, NIST.gov.

How many mL is 0.5 teaspoons?

0.5 US teaspoon = 0.5 x 4.92892159375 = 2.464460796875 mL. FDA pediatric: 2.5 mL on dosing cup mark. Half US teaspoon = about 2.464 mL. No standard 1/2 teaspoon spoon difference from FDA dosing cup mark: 36 µL.

How many mL is 0.25 teaspoons?

0.25 US teaspoon = 0.25 x 4.92892159375 = 1.232230398... mL, approximately 1.232 mL. Quarter teaspoon is a standard US measuring spoon size. 1/4 tsp baking soda = about 1.2g. 1/4 tsp table salt = about 1.42g.

How many mL is 1.5 teaspoons?

1.5 US teaspoons = 1.5 x 4.92892159375 = 7.393382390625 mL. FDA: 7.5 mL on pediatric dosing cups (rounds from 7.393 mL). Standard baking ratio: 1.5 teaspoons baking powder per 1 cup flour for American layer cakes.

How many mL is 3 teaspoons?

3 US teaspoons = 3 x 4.92892159375 = 14.78676478125 mL = exactly 1 US tablespoon = 1/2 US fl oz. Fundamental equivalence: 3 teaspoons = 1 tablespoon. 3 metric teaspoons = 15 mL = 1 metric tablespoon.

What is 1 teaspoon in mL for medicine?

For medicine: 1 teaspoon on US OTC labels = 5 mL (FDA standard). The actual US teaspoon = 4.929 mL. FDA rounds up by 71 µL for simplicity on dosing labels. For any liquid medication: always use the dosing cup, oral syringe, or measuring device provided with the product. Never use a kitchen teaspoon for medicine dosing.

How many teaspoons is 5 mL?

5 mL / 4.92892159375 = 1.01442 US teaspoons, essentially 1 US teaspoon. FDA OTC labels define '1 teaspoon' as 5 mL. Actual US teaspoon = 4.929 mL. Australian and metric teaspoon = 5 mL exactly. 5 mL is the 'FDA teaspoon' and is interchangeable with 1 US teaspoon for all cooking purposes.

Does 1 teaspoon of salt weigh the same as 1 teaspoon of sugar?

No. Both measure the same volume (4.929 mL = 1 US teaspoon), but weigh differently. 1 teaspoon table salt = approximately 5.69g. 1 teaspoon granulated white sugar = approximately 4.2g. 1 teaspoon Diamond Crystal kosher salt = approximately 2.8g. 1 teaspoon Morton kosher salt = approximately 4.8g. Same volume, different masses due to crystal density and packing.

How many mL is a barspoon?

1 cocktail barspoon = 5 mL = 1.014 US teaspoons. The barspoon is 71 µL more than 1 US teaspoon (4.929 mL). For practical cocktail use: 1 US teaspoon is a close substitute for 1 barspoon (1.4% error). 1 barspoon = 5 mL = 1 metric/Australian teaspoon = 1 FDA teaspoon dose.

How many mL is 4 teaspoons?

4 US teaspoons = 4 x 4.92892159375 = 19.71568637500 mL, approximately 19.716 mL. 4 US teaspoons is close to 1 Australian tablespoon (= 20 mL = 4 AU teaspoons). 4 US tsp = 19.716 mL, 284 µL less than 20 mL AU tablespoon.

How many mL is 6 teaspoons?

6 US teaspoons = 6 x 4.92892159375 = 29.5735295625 mL = exactly 1 US fl oz = 2 US tablespoons = standard cocktail jigger (short side). 6 teaspoons = 1 fl oz = 1 jigger is a useful bar equivalence.

How many mL is 48 teaspoons?

48 US teaspoons = 48 x 4.92892159375 = 236.5882365 mL = exactly 1 US cup = 16 US tablespoons = 8 US fl oz. Fundamental: 48 teaspoons = 1 US cup.

Is the Australian teaspoon the same as the US teaspoon?

No. 1 Australian teaspoon = 5 mL (= 1/4 of 20 mL Australian tablespoon). 1 US teaspoon = 4.92892159375 mL. Difference = 71 µL per teaspoon (1.4% larger Australian). For most cooking: interchangeable. In precision baking with many teaspoons: the difference can accumulate (6 AU tsp = 30 mL vs 6 US tsp = 29.574 mL).

How many mL is 0.75 teaspoons?

0.75 US teaspoon = 0.75 x 4.92892159375 = 3.6966911953125 mL, approximately 3.697 mL. Use 1/2 teaspoon + 1/4 teaspoon spoons. FDA pediatric dosing cup mark at 3.75 mL = approximately 0.75 US teaspoons (FDA rounds).

How many mL is 2.5 teaspoons?

2.5 US teaspoons = 2.5 x 4.92892159375 = 12.322303984375 mL, approximately 12.322 mL. Measure as 2 teaspoons + 1/2 teaspoon. Some OTC labels show 12.5 mL as a dosing mark.

How many teaspoons in a tablespoon?

3 US teaspoons = 1 US tablespoon exactly. 3 x 4.92892159375 = 14.78676478125 mL = 1 US tablespoon = 1/2 US fl oz. 1 metric tablespoon = 15 mL = 3 metric teaspoons (at 5 mL each). The US tablespoon (14.787 mL) vs metric tablespoon (15 mL) gap = 213 µL = 3 x 71 µL (three teaspoon gaps).

How many mL is 1/8 teaspoon?

1/8 US teaspoon = 0.125 x 4.92892159375 = 0.616115199... mL, approximately 0.616 mL. Culinary: 1/8 teaspoon is called a pinch. 1 cocktail dash = approximately 0.6-0.9 mL = about 1/8 teaspoon. No standard 1/8 tsp spoon in most US sets; use half of 1/4 teaspoon.

Does 1 teaspoon baking powder differ from 1 teaspoon baking soda?

Both measure 4.929 mL (1 US teaspoon by volume), but are chemically different and not interchangeable. 1 teaspoon baking powder = about 4g (contains baking soda plus cream of tartar and cornstarch). 1 teaspoon baking soda = about 4.6g (pure sodium bicarbonate, 3-4x stronger leavener). Substitute: 1/4 tsp baking soda + 1/2 tsp cream of tartar = 1 tsp baking powder.

How many mL is 5 teaspoons?

5 US teaspoons = 5 x 4.92892159375 = 24.6446079688 mL, approximately 24.645 mL. 5 US teaspoons = 1 tablespoon + 2 teaspoons (= 14.787 + 9.858 = 24.645 mL). No standard cup mark at 5 teaspoons.

How many mL is 1 teaspoon of vanilla extract?

1 teaspoon of vanilla extract = 4.92892159375 mL = 4.929 mL. Same as any other US teaspoon measure. Standard recipe: 1 US teaspoon vanilla per batch of cookies or small cake. Large batch (x4): 4 teaspoons = 19.716 mL vanilla. Instead of buying a 2-oz (59.147 mL) bottle of vanilla and using teaspoons, professional bakers calculate mL for large batches: 1 x recipe = 4.929 mL, 4 x recipe = 19.716 mL.

⚠️ 1 US tsp = 4.929 mL, NOT 5 mL (FDA Rounds!)

Teaspoons to mL Converter: Pediatric Medicine Dosing Decoder, Baking Leavener Precision, Salt Weight Variability, and Why the FDA Rounds 1 Teaspoon to 5 mL

Q: How many mL is 2 teaspoons?

2 US teaspoons = 2 x 4.92892159375 = 9.8578431875 mL, approximately 9.858 mL. FDA OTC: 2 teaspoons = 10 mL (rounds from 9.858 mL, a 142 µL gap). 2 US teaspoons = 2/3 US tablespoon = 1/3 US fl oz.

1 US teaspoon = 4.92892159375 mL exactly (1/3 US tablespoon = 1/6 US fl oz). FDA OTC labels: 1 tsp = 5 mL (rounds up 71 µL). Australian and metric teaspoon = 5 mL. 3 US tsp = 1 US tablespoon = 14.787 mL (3 metric tsp = 15 mL). Salt: 1 tsp table salt = 5.69g but 1 tsp Diamond Crystal kosher = only 2.8g. Four-mode App Decoder: pediatric dosing, baking precision, cocktail measures, international standards. 16 presets from 1/8 tsp to 48 tsp. Free PDF. WhatsApp share.

1 US tsp = 4.929 mL (exact) FDA: 1 tsp = 5 mL (71 µL rounds) 3 US tsp = 1 US tablespoon AU/metric tsp = 5 mL Salt weight varies wildly by type Batch up to 20

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Teaspoons to mL

US Teaspoons

tsp

Common Presets

1 US tsp = 4.929 mL (exact). FDA OTC: 1 tsp = 5 mL (71 µL rounded). 3 US tsp = 1 US tbsp = 14.787 mL. 6 US tsp = 1 fl oz. 48 US tsp = 1 US cup = 236.588 mL. AU/metric tsp = 5 mL. UK traditional = 4.736 mL. Salt: 1 tsp table = 5.69g; Diamond Crystal kosher = 2.8g; Morton kosher = 4.8g.

Conversion Result

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0US tbsp

0fl oz

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Formula and Reference

Why the FDA Rounds 1 Teaspoon to 5 mL: The 71 Microliter Gap That Affects Every US Medicine Cabinet

The US teaspoon is 4.92892159375 mL exactly (1/3 of 14.78676478125 mL per US tablespoon, which is 1/2 of 29.5735295625 mL per US fl oz, per NIST Handbook 44). The FDA rounds this to 5 mL on over-the-counter medicine labels for practical safety reasons: round numbers are easier to measure accurately on a dosing cup, reduce parent confusion, and provide a slight upward safety margin rather than a downward one. The 71 µL difference between 4.929 mL and 5 mL is clinically negligible for any OTC dose but is mathematically real. Three US teaspoons equal one US tablespoon (14.787 mL), while three metric teaspoons equal one metric tablespoon (15 mL). The entire US-vs-metric tablespoon difference is exactly three teaspoon gaps of 71 µL each: 3 x 71 = 213 µL = the difference between a US tablespoon and a metric tablespoon.

Australian and metric teaspoons equal 5 mL exactly (one quarter of the 20 mL Australian tablespoon). The UK traditional teaspoon equaled 1/6 UK fl oz (4.736 mL), actually smaller than the US teaspoon, though modern UK recipes use 5 mL metric teaspoon. For baking: these differences are negligible for one or two teaspoons. For large batches, they accumulate. A recipe scaled to 12 teaspoons of baking powder uses 12 x 4.929 = 59.148 mL (US) vs 12 x 5 = 60 mL (metric) vs the intended 59.147 mL. The 852 µL gap at that scale is less than 1/5 teaspoon. NIST measurement standards at NIST.gov. FDA OTC medicine dosing at FDA.gov.

1 US tsp = 4.929 mL Exact: 4.92892159375 mL = 1/48 US cup = 1/3 US tbsp. FDA OTC rounds to 5 mL. AU/metric = 5 mL. UK traditional = 4.736 mL.

3 US tsp = 14.787 mL = 1 US tablespoon = 1/2 fl oz. 3 metric tsp = 15 mL = 1 metric tablespoon. The US vs metric tablespoon gap (213 µL) = 3 x 71 µL teaspoon gaps.

Salt weight varies up to 2x 1 tsp table salt = 5.69g. Diamond Crystal kosher = 2.8g. Morton kosher = 4.8g. Same 4.929 mL volume, completely different sodium by weight per teaspoon.

How This Four-Mode Teaspoons to mL Converter Works for Parents, Bakers, and Bartenders

Mode 1: Single Teaspoons to mL

Enter any US teaspoon value. Output: mL (to 4 decimal places), US tablespoons, fl oz, and US cups. A cross-reference shows metric/AU (5 mL per tsp) and UK traditional (4.736 mL per tsp) equivalents. 16 presets cover 1/8 tsp through 48 tsp (1 US cup). The bar chart compares your input to key reference sizes (0.25 tsp, 1 tsp, 3 tsp, and 6 tsp/1 fl oz).

Mode 2: App Decoder

Select from four applications: Pediatric and OTC Medicine Dosing (decodes 0.5 tsp through 3 tsp dosing amounts with FDA mL comparison), Baking and Spice Precision (1/8 tsp pinch through 2 tsp with leavener and salt weight notes), Cocktail Teaspoon Measures (dashes, barspoon, simple syrup, and jigger teaspoon equivalents), or International Teaspoon Standards (US vs metric vs AU vs UK traditional, with the 213 µL tablespoon gap explained). The bar chart shows all reference values in the category.

Mode 3: Batch Teaspoons to mL

Enter up to 20 teaspoon values, one per line. Output: a table with mL, US tablespoons, fl oz, and US cups for each. Useful for scaling a baking recipe across all teaspoon-measured ingredients, or a pharmacist creating a reference card for pediatric dosing teaspoon-to-mL equivalents.

Complete Teaspoons to mL Reference: Standard Spoon Sizes, Medicine Dosing Cup Marks, and the 1/8 Tsp Pinch Explained

US Teaspoons	mL	US Tablespoons	fl oz	Common Reference
0.125 tsp (1/8)	0.616 mL	0.042 tbsp	0.021 fl oz	Culinary pinch. No standard 1/8 tsp spoon. Cocktail dash = approx 0.6-0.9 mL.
0.25 tsp (1/4)	1.232 mL	0.083 tbsp	0.042 fl oz	Standard US measuring spoon. Salt: 1/4 tsp table salt = 1.42g. Baking soda: 1/4 tsp = 1.2g.
0.5 tsp (1/2)	2.464 mL	0.167 tbsp	0.083 fl oz	Standard US spoon. FDA pediatric: 2.5 mL cup mark. Baking powder: 1/2 tsp per cup flour (light rise).
0.75 tsp (3/4)	3.697 mL	0.250 tbsp	0.125 fl oz	No standard 3/4 tsp spoon. Use 1/2 tsp + 1/4 tsp. FDA: 3.75 mL dosing mark.
1 tsp	4.929 mL	0.333 tbsp	0.167 fl oz	Standard US measuring spoon. FDA OTC: 5 mL (rounds 71 µL up). AU/metric = 5 mL. UK trad = 4.736 mL.
1.5 tsp	7.393 mL	0.500 tbsp	0.250 fl oz	1/2 US tablespoon. FDA: 7.5 mL pediatric mark. American layer cake standard: 1.5 tsp baking powder per cup flour.
2 tsp	9.858 mL	0.667 tbsp	0.333 fl oz	2/3 US tablespoon. FDA: 10 mL (rounds from 9.858 mL, 142 µL gap). Common pediatric dose. 2 tsp vanilla = 9×13 cake standard.
2.5 tsp	12.322 mL	0.833 tbsp	0.417 fl oz	FDA: 12.5 mL. Use 2 tsp + 1/2 tsp. Between pediatric dosing marks.
3 tsp	14.787 mL	1.000 tbsp	0.500 fl oz	= 1 US tablespoon = 1/2 fl oz. Fundamental equivalence. 3 US tsp = 14.787 mL. 3 metric tsp = 15 mL.
4 tsp	19.716 mL	1.333 tbsp	0.667 fl oz	Close to 1 AU tablespoon (= 20 mL = 4 AU tsp). Gap: 284 µL. Use 4 US tsp ≈ 1 AU tablespoon.
6 tsp	29.574 mL	2.000 tbsp	1.000 fl oz	= 2 US tablespoons = 1 fl oz = cocktail jigger short side. 6 US teaspoons = 1 oz in bar math.
9 tsp	44.361 mL	3.000 tbsp	1.500 fl oz	= 3 US tablespoons = 1.5 fl oz = cocktail jigger long side. Classic double shot.
12 tsp	59.147 mL	4.000 tbsp	2.000 fl oz	= 4 US tablespoons = 1/4 US cup = 2 fl oz.
24 tsp	118.294 mL	8.000 tbsp	4.000 fl oz	= 8 US tablespoons = 1/2 US cup = 4 fl oz = 1 stick US butter.
48 tsp	236.588 mL	16.000 tbsp	8.000 fl oz	= 16 US tablespoons = 1 US cup = 8 fl oz. Fundamental: 48 teaspoons = 1 US cup.

Exact: 1 US tsp = 4.92892159375 mL. Source: NIST.gov NIST Handbook 44. FDA OTC dosing: FDA.gov. SCA coffee: SCA.coffee. TTB: TTB.gov. USDA food data: FDC.nal.usda.gov.

Salt Weight per Teaspoon: Why 1 Teaspoon Is Not 1 Teaspoon When Measured by Sodium

Coarse grind varies widely. Fine grind = similar to table salt. Coarse grind = less dense per tsp.

Salt Type	Volume (1 US tsp)	Weight per 1 US tsp	Sodium per 1 US tsp	Notes
Table salt (iodized)	4.929 mL	~5.69g	~2,287 mg Na	Fine crystals, dense packing. Standard US recipe salt unless specified otherwise.
Morton kosher salt	4.929 mL	~4.8g	~1,920 mg Na	Medium flake. About 15% less sodium per tsp vs table salt by weight.
Diamond Crystal kosher	4.929 mL	~2.8g	~1,120 mg Na	Large hollow flake, very light. ~51% less sodium per tsp vs table salt. Most professional kitchens use Diamond Crystal.
Maldon sea salt	4.929 mL	~3.0-3.5g	~1,170-1,365 mg Na	Flat pyramidal flakes, light. Finishing salt. Similar to Diamond Crystal in sodium per tsp.
Fine sea salt	4.929 mL	~5.0-5.5g	~1,950-2,145 mg Na	Similar to table salt in density. Usually 1:1 substitute for table salt by volume.
Himalayan pink salt	4.929 mL	~5.0-6.0g	~1,888 mg Na

Volume: 1 US tsp = 4.92892159375 mL (constant). Weight per teaspoon varies with crystal size and packing density. Sodium content from USDA FoodData Central at FDC.nal.usda.gov. FDA daily sodium at FDA.gov/food. For precision baking: weigh salt in grams, never measure by teaspoon volume.

Three Real US Examples: A Houston Parent Decoding an Antibiotic Suspension, a Chicago Pastry Chef Scaling Baking Powder, and a Portland Home Bartender Converting Teaspoon Cocktail Measures

Example 1: A Houston Parent Decoding an Amoxicillin Suspension Label: Teaspoons, mL, and Why the Kitchen Spoon Is the Wrong Tool

Amoxicillin 250 mg/5 mL suspension. Prescribed dose: 2 teaspoons (10 mL) twice daily. 2 US tsp = 9.858 mL. FDA: 2 tsp = 10 mL on dosing cup. Always use provided oral syringe or dosing cup. Kitchen teaspoon = 4.929 mL (not exactly 5 mL). 2 kitchen tsp = 9.858 mL (142 µL less than 10 mL dose).

Houston software engineer and parent David has a four-year-old with a strep throat diagnosis. The pediatrician prescribed amoxicillin 250 mg/5 mL suspension with a dose of “2 teaspoons (10 mL) twice daily.” David wants to understand what 2 teaspoons means in actual mL, and whether his kitchen measuring spoon set is acceptable.

The math: 2 US teaspoons = 2 x 4.92892159375 = 9.858 mL. The prescription specifies “10 mL” (FDA rounds). Gap: 10 – 9.858 = 142 µL per dose. At 2 x daily for 10 days = 20 doses x 142 µL = 2.84 mL of antibiotic under-dosed over the course. For a 250 mg/5 mL suspension: 2.84 mL = about 142 mg amoxicillin potentially missed. Is this significant? For most children: no, but for a complete 10-day antibiotic course, using the correct measuring device ensures full dose compliance. More critically: kitchen teaspoon shapes vary by 10-25% in fill volume depending on the spoon head depth. A shallow dessert spoon can deliver 3.5-4 mL per “teaspoon” instead of 4.929 mL. The oral syringe provided with the suspension is the correct tool: it is accurate to 0.1 mL and removes shape variability entirely. FDA medication safety at FDA.gov/consumers. CDC pediatric dosing at CDC.gov. AAP at HealthyChildren.org.

Example 2: A Chicago Pastry Chef Scaling a Cake Recipe from 1 to 6 Tiers and Why Baking Powder Teaspoons Must Be Precise

Yellow cake base recipe: 1.5 tsp baking powder per 1 cup flour. 1-tier: 1.5 tsp = 7.393 mL. 6-tier: 9 tsp = 44.361 mL. Baking powder density: approximately 4g per US tsp. 9 tsp = 36g baking powder. 1/4 tsp variance at scale = 1.232 mL = about 1g baking powder = measurable difference in rise.

Chicago event bakery owner and James Beard-nominated pastry chef Isabella regularly scales wedding cake recipes from a single test batch to 6-tier production. Her base recipe calls for 1.5 teaspoons of baking powder per cup of flour. She needs to understand the mL equivalents to measure precisely at scale and why rounding errors in baking powder teaspoons matter.

Scaling calculation: 1 cup flour batch uses 1.5 US tsp baking powder = 7.393 mL = about 6g of baking powder. A 6-cup flour batch (one tier) uses 9 US tsp = 44.361 mL = about 36g baking powder. A 6-tier wedding cake requiring 36 cups of flour uses 54 US tsp = 266.162 mL = about 216g of baking powder. Why precision matters: 1/4 teaspoon over or under = 1.232 mL = about 1g baking powder. In a single batch: 1g over or under makes a 1.7% difference in leavener, barely detectable. At 6-tier scale (54 tsp), 1/4 tsp error per cup of flour = 9 errors of 1g = 9g baking powder = 4% excess or deficit leavener. A 4% leavener error produces cakes that domes unevenly, has a slightly coarser crumb, or rises inconsistently between tiers. Isabella measures all her baking powder in grams on a precision scale for large batches, converting: 1 tsp = 4.929 mL = about 4g baking powder. USDA food data at FDC.nal.usda.gov. FDA food labeling at FDA.gov/food.

Example 3: A Portland Home Bartender Learning to Convert Teaspoon-Scale Cocktail Measures for Old Fashioneds and Sours

Old Fashioned: 2 oz bourbon (= 6 US tsp = 29.574 mL) + 1 tsp simple syrup (= 4.929 mL) + 2 dashes Angostura (= 2 x 0.7 mL = 1.4 mL). Total: 35.9 mL. Whiskey Sour: 2 oz whiskey (6 tsp = 29.574 mL) + 3/4 oz lemon juice (= 4.5 tsp = 22.180 mL) + 0.75 oz simple syrup (= 4.5 tsp = 22.180 mL).

Portland coffee roaster and weekend home bartender Marcus is learning classic cocktails. He has measuring teaspoons but no jigger. His Old Fashioned recipe calls for “2 oz bourbon, 1 tsp simple syrup, 2 dashes Angostura.” His Whiskey Sour calls for “2 oz whiskey, 3/4 oz lemon juice, 3/4 oz simple syrup.” He needs to translate everything to teaspoons.

Old Fashioned in teaspoons: 2 oz bourbon = 2 x 6 US tsp = 12 US teaspoons = 59.148 mL. Wait: 2 oz = 2 x 29.574 mL = 59.148 mL = 12 US teaspoons. But a more practical measure: 2 oz = 4 US tablespoons = 12 US teaspoons. 1 tsp simple syrup = 4.929 mL. 2 dashes Angostura = approximately 2 x 0.7 mL = 1.4 mL = just under 1/4 US teaspoon. Whiskey Sour: 2 oz whiskey = 12 US teaspoons = 59.148 mL. 3/4 oz lemon juice = 4.5 US teaspoons = 22.180 mL. 3/4 oz simple syrup = 4.5 US teaspoons = 22.180 mL. Key bar-to-teaspoon translation: 1 oz = 6 US teaspoons = 2 tablespoons = 29.574 mL. Barspoon = 5 mL = 1.014 US teaspoons (for stirring, not measuring; use a regular teaspoon). TTB at TTB.gov. NIAAA at NIAAA.nih.gov.

Five Expert Tips: FDA Medicine Dosing Cups, Baking Powder vs Baking Soda, Salt Crystal Math, Vanilla Extract Scaling, and the Barspoon vs Teaspoon Difference

Tip 1: Why FDA Rounds 1 Teaspoon to 5 mL and How to Read a Medicine Dosing Cup

FDA OTC medicine dosing cups are marked in milliliters: 2.5 mL (about 1/2 US tsp), 5 mL (about 1 US tsp), 7.5 mL (about 1.5 US tsp), 10 mL (about 2 US tsp), 15 mL (about 1 US tablespoon), 20 mL, 30 mL. The FDA rounds US teaspoon (4.929 mL) up to 5 mL for clarity and to provide a slight upward safety margin. The 71 µL rounding error accumulates: 2 tsp dose = 10 mL on label vs real 9.858 mL (142 µL gap). 3 tsp = 15 mL label vs real 14.787 mL (213 µL gap). These gaps are clinically negligible for OTC doses but real. For any liquid medicine: always use the measuring cup, oral syringe, or dosing spoon included in the package. Kitchen teaspoons vary in fill volume by 10-25% due to different spoon head shapes, making them unreliable for medicine dosing. FDA drug dosing at FDA.gov/consumers. CDC medication safety at CDC.gov.

Tip 2: Baking Powder vs Baking Soda by Teaspoon: Not the Same and Not Interchangeable by Volume

Both baking powder and baking soda measure the same volume per teaspoon (4.929 mL = 1 US tsp), but they are chemically different and not interchangeable at the same volume. Baking soda (sodium bicarbonate) is about 3-4 times as potent a leavener as baking powder, which contains baking soda diluted with cream of tartar and cornstarch. Standard US ratios: 1 teaspoon baking powder per cup flour (mild rise). 1/4 teaspoon baking soda per cup flour (when acidic ingredient like buttermilk, yogurt, or brown sugar is present). Substitution: 1 teaspoon baking powder = 1/4 teaspoon baking soda + 1/2 teaspoon cream of tartar (= 1.232 mL + 2.464 mL = 3.697 mL, close to 4.929 mL; the cream of tartar provides the acid). By mL: 1 tsp BP = 4.929 mL, substitute = 3.697 mL (the remaining 1.232 mL is mostly air space in the mixture). FDA at FDA.gov/food. USDA data at FDC.nal.usda.gov.

Tip 3: Salt Crystal Math: Why Diamond Crystal Kosher Salt Is Not the Same Teaspoon as Morton or Table Salt

The volume of 1 US teaspoon is always 4.929 mL regardless of what you put in it. But the weight and sodium content per teaspoon of salt varies dramatically by crystal type: Table salt (iodized, NaCl fine): 1 tsp = approximately 5.69g = 2,287 mg sodium. Morton kosher salt (medium flake): 1 tsp = approximately 4.8g = 1,920 mg sodium. Diamond Crystal kosher salt (light hollow flake): 1 tsp = approximately 2.8g = 1,120 mg sodium. Maldon sea salt (flat pyramid flakes): 1 tsp = approximately 3.0-3.5g. This means a recipe developed with Diamond Crystal kosher salt that calls for “1 teaspoon salt” would require only 0.49 US teaspoons of table salt to achieve the same sodium content. Two teaspoons of Diamond Crystal kosher = one teaspoon of table salt by sodium. Professional kitchens and recipe developers (NYT Cooking, Bon Appetit, NYT Best Cookbooks) specify the salt type because the difference is real and detectable. When in doubt: weigh salt in grams rather than measure by teaspoon volume. USDA FoodData at FDC.nal.usda.gov. FDA sodium at FDA.gov/food.

Tip 4: Vanilla Extract Scaling: How to Calculate mL When Doubling or Quadrupling a Baking Recipe

Standard vanilla recipe amounts in US teaspoons and mL: 1/4 tsp vanilla = 1.232 mL (delicate hint, angel food cake). 1/2 tsp vanilla = 2.464 mL (light flavor, sugar cookies). 1 tsp vanilla = 4.929 mL (standard cookies, single layer cake). 2 tsp vanilla = 9.858 mL (rich 9×13 cake). 1 tbsp vanilla = 14.787 mL (large batches, brownies doubled). Scaling a 1-tsp recipe to x4 batch: 4 x 4.929 = 19.716 mL = 4 US teaspoons exactly. Scaling to x10 batch: 10 x 4.929 = 49.290 mL ≈ 3 tablespoons + 1 teaspoon (= 44.361 + 4.929 = 49.290 mL, exact). Pure vanilla extract (80-100 mg/mL vanillin) vs imitation vanilla (synthetic vanillin, 1.5-3x higher vanillin concentration): for large commercial batches, imitation vanilla delivers more flavor per mL. For home baking, 1 tsp pure = 1 tsp imitation in volume but not in flavor complexity. USDA data at FDC.nal.usda.gov. FDA flavorings at FDA.gov/food.

Tip 5: Barspoon vs US Teaspoon: 71 µL Apart and Why It Matters in Cocktails

A cocktail barspoon = 5 mL = 1 metric/Australian teaspoon = 1.014 US teaspoons. A US teaspoon = 4.929 mL = 0.986 barspoons. For practical bartending: 1 US teaspoon makes an excellent substitute for 1 barspoon (1.4% error, undetectable in a cocktail). 1 barspoon is used for: absinthe rinse (1 barspoon = 5 mL absinthe coating inside a chilled glass), float (slowly pouring 5 mL of a dense spirit over the back of the barspoon onto a lighter spirit), and adding small modifiers. Cocktail teaspoon math: 1 tsp = 4.929 mL. 3 tsp = 14.787 mL = 1 tbsp = 0.5 fl oz. 6 tsp = 29.574 mL = 1 fl oz = standard jigger shot. 9 tsp = 44.361 mL = 1.5 fl oz = double. 1 cocktail dash = approximately 0.6-0.9 mL (varies by bottle type and angle), not a standard unit. NIAAA standard drink at NIAAA.nih.gov. TTB spirits at TTB.gov.

Quick Reference: Common US Teaspoon Values Converted to mL

US Teaspoons	mL	US Tbsp	FDA mL	Reference	Source
0.125 tsp	0.616 mL	0.042 tbsp	approx 0.6 mL	Culinary pinch. Cocktail dash. No standard spoon.	NIST.gov.
0.25 tsp	1.232 mL	0.083 tbsp	1.25 mL	1/4 tsp. Standard US baking spoon. Baking soda, cayenne, fine salt.	NIST.gov.
0.5 tsp	2.464 mL	0.167 tbsp	2.5 mL	1/2 tsp. Standard spoon. Pediatric: 2.5 mL cup mark.	NIST.gov. FDA.gov.
1 tsp	4.929 mL	0.333 tbsp	5 mL	Standard spoon. FDA: 5 mL (71 µL rounds). AU/metric tsp = 5 mL. UK traditional = 4.736 mL.	NIST.gov. FDA.gov.
1.5 tsp	7.393 mL	0.500 tbsp	7.5 mL	= 1/2 US tablespoon. Standard cake leavener ratio. FDA: 7.5 mL pediatric mark.	NIST.gov. FDA.gov.
2 tsp	9.858 mL	0.667 tbsp	10 mL	FDA: 10 mL (142 µL rounds). 2 tsp vanilla = 9×13 cake standard.	NIST.gov. FDA.gov.
3 tsp	14.787 mL	1.000 tbsp	15 mL	= 1 US tablespoon. FDA: 15 mL (213 µL rounds). 3 metric tsp = 15 mL exactly.	NIST.gov. FDA.gov.
6 tsp	29.574 mL	2.000 tbsp	30 mL	= 2 US tablespoons = 1 fl oz = cocktail jigger. FDA: 30 mL.	NIST.gov. TTB.gov.
12 tsp	59.147 mL	4.000 tbsp	60 mL	= 4 US tablespoons = 1/4 US cup = 2 fl oz.	NIST.gov.
48 tsp	236.588 mL	16.000 tbsp	240 mL	= 1 US cup = 16 US tablespoons = 8 fl oz. Fundamental: 48 tsp = 1 cup.	NIST.gov. 1 US cup = 236.5882365 mL exact.
1 tsp (ref)	4.92892159375 mL	1/3 tbsp	5 mL (FDA)	Exact: 1/3 x 14.78676478125 mL/US tbsp. 1/6 US fl oz. 1/48 US cup.	NIST Handbook 44, NIST.gov.

Exact: 1 US tsp = 4.92892159375 mL. Source: NIST.gov. OTC medicine: FDA.gov. Cocktail: TTB.gov. USDA: FDC.nal.usda.gov. SCA: SCA.coffee.

Frequently Asked Questions: Teaspoons to mL

1 US teaspoon = 4.92892159375 mL exactly. FDA OTC labels: 1 teaspoon = 5 mL (rounds up 71 µL). Australian and metric teaspoon = 5 mL. UK traditional = 4.736 mL. Source: NIST Handbook 44, NIST.gov.

2 US teaspoons = 9.85784318750 mL, approximately 9.858 mL. FDA OTC: 2 teaspoons = 10 mL (rounds from 9.858 mL, 142 µL gap). Common pediatric ibuprofen and acetaminophen dose for 48-59 lb children.

For medicine: FDA OTC labels define 1 teaspoon as 5 mL. The actual US teaspoon = 4.929 mL. For liquid medication: always use the provided dosing cup or oral syringe. Never use a kitchen teaspoon for medicine; kitchen spoons vary in fill volume by 10-25%.

0.25 US teaspoon = 1.232 mL. Standard US measuring spoon size. 1/4 tsp baking soda = about 1.2g. 1/4 tsp table salt = about 1.42g. FDA pediatric: 1.25 mL (FDA rounds from 1.232 mL).

0.5 US teaspoon = 2.464 mL. Standard US measuring spoon. FDA pediatric: 2.5 mL cup mark (rounds from 2.464 mL). Half-teaspoon is standard for moderate baking powder ratios and many spice measures.

3 US teaspoons = 14.78676478125 mL = exactly 1 US tablespoon = 1/2 US fl oz. Fundamental kitchen equivalence: 3 teaspoons = 1 tablespoon. 3 metric teaspoons = 15 mL = 1 metric tablespoon.

5 mL / 4.92892159375 = 1.01442 US teaspoons, essentially 1 US teaspoon. FDA defines “1 teaspoon” as 5 mL on OTC labels. Australian and metric teaspoon = 5 mL exactly. For cooking: 5 mL = 1 US teaspoon.

No. Both measure 4.929 mL by volume. But 1 tsp table salt = about 5.69g while 1 tsp granulated white sugar = about 4.2g. Same volume, different densities. Also: 1 tsp Diamond Crystal kosher salt = 2.8g (about half the weight of table salt per teaspoon).

1 barspoon = 5 mL = 1.014 US teaspoons. A barspoon is 71 µL more than a US teaspoon (4.929 mL). In cocktail use: 1 US teaspoon is a close substitute for 1 barspoon (1.4% difference, undetectable in a cocktail).

1.5 US teaspoons = 7.393 mL = 1/2 US tablespoon. FDA pediatric: 7.5 mL dosing cup mark. American layer cake standard: 1.5 tsp baking powder per cup flour. Measure as 1 teaspoon + 1/2 teaspoon.

3 US teaspoons = 1 US tablespoon = 14.787 mL. 3 metric teaspoons (5 mL each) = 1 metric tablespoon = 15 mL. The difference: 213 µL. This 213 µL is exactly 3 x 71 µL (three US-to-metric teaspoon gaps accumulated).

No. 1 Australian teaspoon = 5 mL (= 1/4 of 20 mL Australian tablespoon). 1 US teaspoon = 4.929 mL. Difference = 71 µL per teaspoon (1.4%). For most cooking: interchangeable. In precision baking: note that 6 AU tsp = 30 mL vs 6 US tsp = 29.574 mL.

4 US teaspoons = 19.716 mL = 1 tablespoon + 1 teaspoon = 4/3 US tablespoons. 4 US teaspoons is close to 1 Australian tablespoon (20 mL = 4 AU teaspoons), short by 284 µL. Use 4 US teaspoons as an approximation for 1 AU tablespoon.

6 US teaspoons = 29.574 mL = 2 US tablespoons = 1 US fl oz = standard cocktail jigger short side. 6 teaspoons = 1 fl oz is a key bar-to-teaspoon equivalence for home bartenders.

1/8 US teaspoon = 0.616 mL. Called a culinary pinch. No standard 1/8 tsp measuring spoon in most US sets; use half of 1/4 teaspoon. 1 cocktail dash = approximately 0.6-0.9 mL, close to 1/8 teaspoon.

2.5 US teaspoons = 12.322 mL. Measure as 2 teaspoons + 1/2 teaspoon. Some OTC pediatric labels show 12.5 mL as a dosing mark (FDA rounds from 12.322 mL).

Both measure 4.929 mL (1 US teaspoon) but are different chemicals. Baking soda is 3-4x as potent a leavener as baking powder. Substitute: 1 tsp baking powder = 1/4 tsp baking soda + 1/2 tsp cream of tartar. Do not substitute 1:1 by teaspoon volume.

0.75 US teaspoon = 3.697 mL. No standard 3/4 tsp measuring spoon in most US sets; use 1/2 tsp + 1/4 tsp. FDA pediatric: 3.75 mL dosing cup mark (FDA rounds from 3.697 mL).

5 US teaspoons = 24.645 mL = 1 tablespoon + 2 teaspoons. No standard cup measure at 5 teaspoons; use 1 US tablespoon + 2 US teaspoons. 5 US teaspoons is close to 24 mL (slightly more, 645 µL).

1 teaspoon of vanilla extract = 4.929 mL (the same as any other teaspoon measure). Scale: 2 tsp = 9.858 mL. 4 tsp = 19.716 mL. 1 tablespoon = 14.787 mL. A 2-oz bottle of vanilla = 59.147 mL = about 12 US teaspoons.

48 mL / 4.92892159375 = 9.742 US teaspoons, approximately 9 teaspoons + 2.2 teaspoons, or 9 US teaspoons + 2 US teaspoons = 9 tsp + 2 tsp = 11 US teaspoons = 54.218 mL… let me recalculate: 48/4.92892 = 9.742 US teaspoons = 9 tsp + 0.742 tsp = 9 tsp + 3/4 tsp (0.75 tsp = 3.697 mL). Use 9 US teaspoons + 3/4 teaspoon = 44.361 + 3.697 = 48.058 mL (within 58 µL of 48 mL).

Related Volume Calculators

🔁 mL to Teaspoons Reverse: 5 mL = 1.014 US tsp. 10 mL = 2.029 US tsp. Medicine dosing cup mL to US teaspoons. 🥄 Tablespoons to mL 1 US tbsp = 14.787 mL = 3 US tsp. AU tablespoon = 20 mL (35% more!). 4-mode App Decoder. 🧪 mL to Tablespoons 30 mL = 2 US tbsp = 1 fl oz. EU cocktail mL to US tablespoons. 250 mL EU cup decoder. ☕ Cups to mL 1 US cup = 48 tsp = 16 tbsp = 236.588 mL. EU cup = 250 mL (not equal). Coffee and recipe. 🍺 Fl Oz to mL 1 fl oz = 6 US tsp = 2 US tbsp = 29.574 mL. Cocktail jigger to mL. TSA 3-1-1 checker. 📏 mL to Fl Oz 30 mL = 1.014 fl oz = 6.086 US tsp. EU cocktail mL to fl oz. Import bottle decoder. 🔄 Liters to Quarts 1L = 1.057 US qt = 202.884 US tsp. EU recipe liters to US teaspoons and quarts. 🟦 Pints to mL 1 US pint = 96 US tsp = 32 US tbsp = 473.18 mL. US vs UK pint gap explained.

Legal Disclaimer and Editorial Transparency

The Teaspoons to mL Converter on USCalculators.com is for educational and informational purposes only. Exact: 1 US teaspoon = 4.92892159375 mL (= 1/3 x 14.78676478125 mL per US tablespoon = 1/6 x 29.5735295625 mL per US fl oz per NIST Handbook 44). Source: NIST.gov. Australian teaspoon = 5 mL (= 1/4 of 20 mL Australian tablespoon per Standards Australia). Metric/EU teaspoon = 5 mL. UK traditional teaspoon = 1/6 UK fl oz = 4.73551 mL. FDA OTC medicine: 1 teaspoon = 5 mL; 2 teaspoons = 10 mL; 3 teaspoons = 15 mL per FDA OTC dosing label conventions. For any liquid medication dosing, always use the measuring cup, oral syringe, or dosing spoon included with the product. Never use a kitchen teaspoon for medicine measurement. FDA drug safety at FDA.gov/consumers. CDC medication safety at CDC.gov. AAP pediatric guidance at HealthyChildren.org. Salt weight data from USDA FoodData Central at FDC.nal.usda.gov. FDA sodium guidelines at FDA.gov/food. Cocktail measures: TTB at TTB.gov. NIAAA alcohol guidelines at NIAAA.nih.gov. SCA coffee standards at SCA.coffee. Recipe conversion information is for general informational purposes. This tool does not constitute medical, pharmaceutical, or professional advice.