mL to Fl Oz Converter: TSA Carry-On Checker, Import Label Decoder, and US vs European Container Size Guide
1 mL = 0.033814 US fl oz (exact). Convert mL to fl oz for travel packing, imported product labels, medicine dosing, and beer can comparisons. TSA 3-1-1: 100 mL = 3.381 fl oz (under the 3.4 fl oz limit). 355 mL = exactly 12 fl oz. 750 mL = 25.36 fl oz. Free PDF. WhatsApp share.
mL to Fl Oz
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Formula and Reference
Why Americans Need mL to Fl Oz: TSA Packing, Imported Beer Cans, European Cosmetics, and Pediatric Medicine Doses
Four very different situations push Americans to convert milliliters to fluid ounces every day. First, travel packing: the TSA 3-1-1 rule says each liquid container must hold 3.4 fl oz or less. Most imported toiletries list only mL, so a traveler looking at a 150 mL shampoo needs to know that is 5.07 fl oz, well over the limit, before they pack it. A 100 mL bottle is 3.381 fl oz, under the 3.4 fl oz threshold, and TSA-safe. Second, imported beverages: European beer cans hold 330 mL (11.15 fl oz), while US cans hold 355 mL (exactly 12 fl oz). That is 7.3% more beer in the US can, relevant when comparing prices at a specialty beer shop. Third, cosmetics and skincare: a 50 mL serum from a French brand is 1.69 fl oz; a 100 mL moisturizer from South Korea is 3.38 fl oz. US consumers used to fl oz need these conversions to compare sizes and prices. Fourth, pediatric medicine: doctors and pharmacists always dose liquid children's medicine in mL. A parent prescribed "give 10 mL" needs to know that is 2 medicine teaspoons (5 mL each by FDA convention), not kitchen teaspoons (which are slightly smaller at 4.929 mL). Every one of these scenarios is handled in this calculator.
The exact conversion: 1 mL = 0.033814022701843... US fluid ounces, which comes from the reciprocal of the exact 1 US fl oz = 29.5735295625 mL value. The US gallon = 231 cubic inches (legal US definition). One inch = 2.54 cm (NIST). Therefore 1 US gallon = 231 x 2.54³ mL = 3,785.411784 mL. Since 1 US gallon = 128 US fl oz, 1 fl oz = 3785.411784 / 128 = 29.5735295625 mL exactly, and 1 mL = 1 / 29.5735295625 = 0.033814... US fl oz. NIST unit conversions at NIST.gov. TSA 3-1-1 rule at TSA.gov. TTB beverage labeling at TTB.gov.
How the US Fluid Ounce Is Calculated From Metric Fundamentals
Most people know the conversion number but not where it comes from. Here is the full derivation. The US fluid ounce is defined through a chain of exact legal definitions. Start with the US gallon: the Uniform Weights and Measures Law defines 1 US liquid gallon as exactly 231 cubic inches. This is a legal, not a measured, value. The inch is defined by NIST (National Institute of Standards and Technology) as exactly 2.54 centimeters, meaning 1 cubic inch = 2.54³ = 16.387064 cubic centimeters = 16.387064 milliliters. Multiplying: 1 US gallon = 231 x 16.387064 = 3,785.411784 mL, also exact. Since 1 US gallon = 128 US fluid ounces (another US customary legal definition), 1 fl oz = 3785.411784 / 128 = 29.5735295625 mL exactly. And the reverse: 1 mL = 1 / 29.5735295625 = 0.033814022701843 US fl oz, also exact. This is the value used for FDA labeling, TTB beverage compliance, USDA food measurement standards, and international trade documents. Any other value (e.g., rounding 1 fl oz to 30 mL or 0.034 fl oz per mL) introduces error, acceptable for consumer packaging but not for regulatory compliance. NIST Handbook 44 at NIST.gov. NIST metric program at NIST.gov/metric. US Code definition of gallon at USC.house.gov.
US vs UK Fluid Ounce: Implications for International Product Labeling and Bartending
When a UK cocktail recipe calls for "1 fl oz" of gin, it means 28.4130625 mL (1 UK fl oz). When a US bartender reads that same recipe and pours "1 fl oz," they pour 29.5735295625 mL (1 US fl oz). The UK pour is 4.1% less. Over a full cocktail menu with 20 items each requiring 1 fl oz of spirits, that is 0.4265 mL x 20 = 8.53 mL of extra spirits per cocktail service round using US fl oz measures versus UK fl oz. Across 200 cocktails per night, that is 200 x 8.53 mL = 1,706 mL = 1.706 liters of extra spirits consumed compared to UK recipe volumes. At $40 per 750 mL bottle of well spirits ($0.053/mL), that is $90.60 per night in extra spirits cost due to the fl oz unit difference alone. For US bars following British cocktail books, scaling the recipes from UK fl oz to US fl oz means multiplying by 28.4130625 / 29.5735295625 = 0.9608, or approximately multiplying by 0.96. A UK recipe calling for 40 mL should be adjusted to 40 / 29.5735295625 = 1.353 US fl oz (not 1.5 fl oz, not exactly 1 US fl oz). Bartender's Guide to conversions at TTB.gov. UK measure regulations at legislation.gov.uk.
How This Three-Mode mL to US Fl Oz Converter Works for Travelers, Importers, and Parents
Mode 1: Single mL to US Fl Oz (with TSA Status)
Enter any mL value. Output: US fluid ounces, teaspoons, tablespoons, and cups. Every result automatically checks the TSA 3-1-1 carry-on limit: is this container 3.4 fl oz (100.55 mL) or under? The display shows a clear TSA-safe or exceeds limit note, so travelers can verify their toiletries without guessing. 16 presets range from 5 mL (medicine teaspoon) to 1,000 mL (1-liter bottle). Toggle for UK fl oz (28.4130625 mL each) for UK recipe or import conversions.
Mode 2: Import Label Decoder
Enter the mL value printed on any imported product. Output: US fl oz, the TTB-required dual-label format for wine and spirits imports, TSA carry-on status, and a nearest-common-size identification from a 16-item reference table. The table covers all standard import sizes from 5 mL medicine dose through 1,000 mL bottle, with TSA status highlighted for each. Bar chart shows where your entered value falls relative to the common reference ladder: medicine tsp (5 mL), perfume sample (30 mL), TSA max (100 mL), European beer (330 mL), US beer (355 mL), water (500 mL), wine bottle (750 mL), and 1 liter.
Mode 3: Batch mL to Fl Oz
Enter up to 20 mL values, one per line. Output: a table with US fl oz, teaspoons, tablespoons, cups, and TSA status for each. Useful for event planners comparing a list of imported wine and spirits for pricing, importers building a US label compliance checklist, or a cosmetics brand converting their entire European product line mL sizes to US fl oz for American distribution.
The Complete Import Label Size Reference: mL to Fl Oz, TSA Status, and Common US Equivalents
| mL | US Fl Oz | TSA | tsp | Common Use / Product |
|---|---|---|---|---|
| 5 mL | 0.169 fl oz | Safe | 1 medicine tsp | FDA medicine teaspoon. Eye drops. Single-use skincare packet. Pediatric dose. |
| 10 mL | 0.338 fl oz | Safe | 2 medicine tsp | Pediatric Tylenol/ibuprofen dose range. Eye drop bottle. |
| 15 mL | 0.507 fl oz | Safe | 3 medicine tsp | 1 medicine tablespoon. Cold medicine adult dose. |
| 30 mL | 1.014 fl oz | Safe | 6 medicine tsp | Labeled "1 fl oz" on cosmetics (convention). Small perfume. Travel-size liquid. |
| 50 mL | 1.691 fl oz | Safe | 10 tsp | Small perfume or cologne. EU cosmetic travel size. Under TSA limit. |
| 100 mL | 3.381 fl oz | Safe | 20.3 tsp | TSA carry-on max. 3.381 fl oz under 3.4 fl oz limit (=100.55 mL). Skincare TSA size. |
| 118.3 mL | 4.000 fl oz | Over | 24 tsp | 4 fl oz baby bottle (exactly 118.294 mL). Exceeds TSA carry-on limit. |
| 250 mL | 8.454 fl oz | Over | 50.8 tsp | European measuring cup. 250 mL juice glass. Slightly more than 1 US cup (236.6 mL). |
| 330 mL | 11.153 fl oz | Over | 67 tsp | European beer can standard (Heineken, Stella, Guinness in Europe). 11.15 fl oz. |
| 355 mL | 12.000 fl oz | Over | 72 tsp | US/Canadian beer can. Exactly 12 fl oz (= 354.88 mL, labeled 355 on cans). |
| 473 mL | 15.984 fl oz | Over | 96 tsp | 1 US pint = 16 fl oz (473.176 mL). US craft beer pint glass. |
| 500 mL | 16.907 fl oz | Over | 101.4 tsp | Standard water bottle (labeled 16.9 fl oz). European half-liter reference. |
| 750 mL | 25.361 fl oz | Over | 152.1 tsp | Standard wine/spirits bottle. TTB label: "750 mL (25.36 fl oz)". 5.07 wine pours. |
| 1,000 mL | 33.814 fl oz | Over | 202.8 tsp | 1-liter spirits or water bottle. TTB label: "1 L (33.8 fl oz)". |
| 1,750 mL | 59.174 fl oz | Over | 354.8 tsp | Spirits "handle" (1.75 L). TTB label: "1.75 L (59.17 fl oz)". Approx 39 shots. |
Formula: fl oz = mL / 29.5735295625 (exact). TSA limit: 3.4 fl oz = 100.5500025 mL. Source: NIST.gov, TSA.gov, TTB.gov. All containers marked "Over" exceed TSA per-container carry-on limit. All fits-in-quart-bag and quantity requirements still apply regardless of container size.
Three Real US Examples: TSA-Proofing a Carry-On, Comparing European and US Beer Pricing, and Decoding a Child's Ibuprofen Dose
Example 1: A Los Angeles Traveler Packing a Carry-On for a Business Trip to Paris
Batch: 100 mL = 3.381 fl oz (Safe). 50 mL = 1.691 fl oz (Safe). 250 mL = 8.454 fl oz (Over TSA). 30 mL = 1.014 fl oz (Safe). Total quart-bag check: 3 TSA-safe items plus 1 over-limit item to check-bag or buy in Paris.
Los Angeles marketing director Sarah is packing for a 5-day Paris business trip. She wants to bring her Korean skincare routine in her carry-on. Her products: 100 mL toner (Innisfree), 50 mL serum (Beauty of Joseon), 250 mL moisturizer (Laneige), 30 mL eye cream (COSRX). Which can go in her TSA quart bag?
Batch conversion: 100 mL = 3.381 fl oz, TSA-safe. 50 mL = 1.691 fl oz, TSA-safe. 250 mL = 8.454 fl oz, over the 3.4 fl oz (100.55 mL) TSA limit. 30 mL = 1.014 fl oz, TSA-safe. The 250 mL moisturizer must go in checked luggage or she can buy a 100 mL travel size before the flight. The three safe items (100 + 50 + 30 = 180 mL) all fit in one quart-size bag with room for other essentials. Note: the quart bag limit is one per person, and all items must fit inside, even if each is under 100 mL individually. TSA 3-1-1 rules at TSA.gov. TSA travel prep at TSA.gov.
Example 2: A Chicago Beer Shop Owner Comparing Imported European 330 mL Cans to US 355 mL Cans for Shelf Pricing
Single: 330 mL = 11.153 fl oz. 355 mL = 12.000 fl oz. European can has 7.3% less beer. Per-oz price: if $2.99 per 330 mL can = $2.99 / 11.153 fl oz = $0.268/fl oz. If $2.79 per 355 mL can = $2.79 / 12 fl oz = $0.233/fl oz. The 355 mL US can is 13.5% better value per fl oz despite the lower price.
Chicago craft beer shop owner Mike is stocking his cooler with both Heineken (330 mL cans imported from the Netherlands) and a comparable craft lager in US 355 mL cans. He wants to price both to attract customers while staying profitable. How does he calculate the per-fl-oz price for comparison?
Single conversion: 330 mL European can = 11.153 fl oz. 355 mL US can = 12.000 fl oz. The US can is 25 mL (0.847 fl oz) more per can. Pricing: if Mike prices Heineken at $2.99 per can: $2.99 / 11.153 = $0.268 per fl oz. If he prices the craft can at $2.79: $2.79 / 12 = $0.233 per fl oz. The craft lager at $2.79 delivers 13.2% more value per fl oz than the import at $2.99. To equalize per-fl-oz pricing, he would need to price the 330 mL import at: $0.233 x 11.153 = $2.60 per can. Alternatively, if cost of both to him is the same, the 355 mL can is inherently more competitive on value per fl oz. Alcohol import TTB regulations at TTB.gov/importers. Illinois Liquor Control Commission at IDFPR.Illinois.gov.
Example 3: A Seattle Parent Verifying a Pediatrician's 10 mL Children's Ibuprofen Dose
Single: 10 mL = 10 / 29.5735295625 = 0.338 fl oz = 2.0 medicine teaspoons (5 mL each, per FDA). Using a kitchen teaspoon instead (4.929 mL each): 2 kitchen tsp = 9.858 mL, about 1.4% under. Use the provided dosing syringe or marked cup, never a kitchen spoon.
Seattle parent David's 5-year-old has a fever. The pediatrician prescribed children's ibuprofen suspension (100 mg/5 mL): "Give 10 mL every 6-8 hours as needed." David wants to understand this in teaspoons and fl oz, and whether he can use a kitchen measuring spoon if he cannot find the dosing syringe.
Single conversion: 10 mL = 10 / 29.5735295625 = 0.338 fl oz = 2.031 kitchen teaspoons (1 kitchen tsp = 4.929 mL). But the FDA defines "medicine teaspoon" as exactly 5 mL, different from the culinary teaspoon. So 10 mL = exactly 2 FDA medicine teaspoons. A kitchen teaspoon holds about 4.929 mL, so 2 kitchen teaspoons = 9.858 mL, which is 0.142 mL short of the 10 mL dose. For an adult drug this is negligible. For weight-dosed pediatric medicine, the FDA recommends always using the marked oral dosing syringe or cup that comes with the product, never a kitchen spoon. David should use the included dosing syringe marked at 10 mL. FDA pediatric medicine dosing at FDA.gov. AAP medication safety at HealthyChildren.org. Poison Control: 1-800-222-1222.
Five Expert Tips: TSA 3-1-1 Exact Numbers, EU vs US Beer Cans, FDA Medicine Labeling, Cosmetic Rounding, and TTB Import Requirements
Tip 1: The TSA 3-1-1 Rule Exact Numbers: 3.4 fl oz Is NOT Exactly 100 mL
Many travelers assume the TSA limit is exactly 100 mL because TSA.gov says "3.4 fl oz (100 mL)." But 3.4 fl oz = 3.4 x 29.5735295625 = 100.5500025 mL, not exactly 100 mL. The practical takeaway: containers labeled "100 mL" are 3.381 fl oz, safely under the 3.4 fl oz limit. Containers labeled "101 mL" or more exceed 3.4 fl oz and technically fail the TSA rule. TSA agents in practice accept 100 mL containers and rarely measure precisely to the milliliter. But for international travel where security screeners may be stricter (EU security checkpoints also enforce 100 mL per item, with the identical non-round relationship), stick to 100 mL or under. TSA rules also require all containers to fit in a single quart-sized clear plastic zip-lock bag (1 quart = 0.946 liters), with one such bag per passenger. TSA.gov at TSA.gov. TSA PreCheck (no quart bag required) at TSA.gov/precheck. International Air Transport Association (IATA) liquid rules at IATA.org.
Tip 2: European 330 mL vs US 355 mL Beer Cans: Why the Difference and How to Compare Prices
The 330 mL European beer can standard dates to the late 1950s when European breweries, under British Imperial influence, standardized on one-third of an Imperial pint: 1 Imperial pint = 568 mL, 1/3 = 189 mL (actually they standardized on one-third of a liter = 333 mL, rounded to 330 mL). The US 12 fl oz (355 mL) can was designed in the 1930s by American can manufacturers who built equipment around US fluid ounce multiples. Today: 330 mL = 11.153 fl oz. 355 mL = 12.000 fl oz. The US can holds 7.57% more beer. When comparing imported European craft beers to domestic beers by price, always compute the per-fl-oz price: $/fl oz = $ / (mL / 29.5735295625). A $3.49 Heineken 330 mL can = $3.49 / 11.153 = $0.313/fl oz. A $2.99 Sierra Nevada 355 mL can = $2.99 / 12 = $0.249/fl oz. TTB beer import regulations at TTB.gov. Brewers Association craft beer data at BrewersAssociation.org.
Tip 3: FDA Cosmetic Label Rounding and the 30 mL vs 29.57 mL Convention Explained
The FDA Fair Packaging and Labeling Act (15 USC 1453) requires consumer commodity labels to state net contents in both metric and US customary units. For a 30 mL perfume, the dual label might read "1 fl oz (30 mL)" even though 1 fl oz = 29.5735 mL. This is FDA-permitted because the regulation allows rounding to the nearest whole milliliter or nearest 0.5 fl oz for many product categories. The exact value: 30 mL = 1.01442 fl oz. The 0.4265 mL overstatement (1.44%) is within tolerance. However, for shampoos, conditioners, and hair care products, FDA 21 CFR 701.13 requires the quantity to be accurate and not misleading. The practical standard: cosmetic companies round to the nearest whole mL and the nearest tenth fl oz. So a 59.15 mL (2 fl oz) double-shot container might be labeled "2 fl oz (60 mL)." FDA cosmetic labeling at FDA.gov/cosmetics. FTC FPLA at FTC.gov.
Tip 4: TTB Dual-Label Requirements for Wine and Spirits Imports: What Every mL Size Must Show in Fl Oz
Every wine, beer, and spirits container sold in the US must display both metric and US customary volume under TTB regulations (27 CFR Part 4 for wine, Part 5 for spirits, Part 7 for malt beverages). The required dual-label format for common import sizes: 50 mL = "1.7 fl oz (50 mL)." 100 mL = "3.4 fl oz (100 mL)" (TTB rounds 3.381 to 3.4 for simplicity). 187 mL = "6.3 fl oz (187 mL)." 375 mL = "12.7 fl oz (375 mL)." 750 mL = "25.36 fl oz (750 mL)." 1 L = "33.8 fl oz (1 L)." 1.75 L = "59.2 fl oz (1.75 L)." TTB's COLA (Certificate of Label Approval) process reviews every label before it can be sold in the US. Non-compliant labels are rejected. Importers who skip TTB approval face seizure. TTB COLA online at TTB.gov/cola. TTB beverage alcohol import guide at TTB.gov/importers. US Customs CBP food/drug imports at CBP.gov.
Tip 5: Pediatric Liquid Medicine: Why mL Is Safer Than Teaspoons for Children's Dosing
The American Academy of Pediatrics (AAP) recommends that pediatric liquid medicine dosing instructions use milliliters, not teaspoons, because kitchen teaspoons vary in size (4.5 to 5.5 mL depending on the spoon) while mL is precise. Studies have shown that dosing errors are significantly more common when teaspoons or tablespoons are used rather than mL. The FDA requires liquid OTC pediatric medicine labels to provide dosing instructions in mL and to include a calibrated measuring device (oral syringe or dosing cup marked in mL). The FDA also prohibits the use of tablespoons on medicine labels for children under 2 years. Common pediatric doses in mL: children's ibuprofen 100 mg/5 mL: typical dose 5-10 mL depending on weight. Children's acetaminophen 160 mg/5 mL: typical dose 5-7.5 mL at ages 2-3. Always confirm dose with a pediatrician. 10 mL = 0.338 fl oz = 2 medicine teaspoons = 2/3 tablespoon. Never use a kitchen spoon. AAP pediatric dosing at HealthyChildren.org. FDA safe medicine use for children at FDA.gov. Poison Control: 1-800-222-1222 or Poison.org.
Quick Reference: Common mL Values Converted to US Fl Oz
| mL | US Fl Oz | TSA 3-1-1 | Common Product / Use |
|---|---|---|---|
| 5 mL | 0.169 fl oz | Safe | 1 FDA medicine teaspoon. Pediatric dose. Eye drops. |
| 30 mL | 1.014 fl oz | Safe | Labeled "1 fl oz" on cosmetics. Small perfume. Travel liquid. |
| 50 mL | 1.691 fl oz | Safe | Travel-size cosmetic. Cologne miniature. Well under TSA limit. |
| 100 mL | 3.381 fl oz | Safe | TSA carry-on maximum per container. 3.381 fl oz under 3.4 fl oz limit. |
| 250 mL | 8.454 fl oz | Over limit | European juice glass. EU measuring cup. Slightly over 1 US cup (236.6 mL). |
| 330 mL | 11.153 fl oz | Over limit | Standard European beer can (Heineken, Stella, Guinness EU). |
| 355 mL | 12.000 fl oz | Over limit | Standard US/Canadian beer can. Exactly 12 fl oz by design. |
| 500 mL | 16.907 fl oz | Over limit | Standard water bottle (labeled "16.9 fl oz"). European half-liter. |
| 750 mL | 25.361 fl oz | Over limit | Standard wine/spirits bottle. TTB label: "750 mL (25.36 fl oz)". |
| 1,000 mL | 33.814 fl oz | Over limit | 1-liter bottle. TTB label: "1 L (33.8 fl oz)". Sports bottle. |
| 1 mL (reference) | 0.033814 fl oz | Safe | Exact: 1/29.5735295625 fl oz. Source: NIST.gov. US gallon / 128 = 29.5735295625 mL/fl oz. |
Formula: fl oz = mL / 29.5735295625 (exact). TSA 3.4 fl oz = 100.5500025 mL. Source: NIST.gov. TSA rules at TSA.gov. TTB labeling at TTB.gov.
Frequently Asked Questions: mL to Fl Oz
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Legal Disclaimer and Editorial Transparency
The mL to Fl Oz Converter on USCalculators.com is for educational and informational purposes only. Conversion formula: 1 mL = 0.033814022701843 US fl oz (exact, derived from 1 fl oz = 29.5735295625 mL; 1 US gallon = 231 cubic inches; 1 inch = 2.54 cm; 1 US gallon = 3,785.411784 mL; 1 US gallon = 128 fl oz). Source: NIST Handbook 44 at NIST.gov. TSA 3-1-1 rule: 3.4 fl oz = 100.5500025 mL per container maximum. Current TSA rules at TSA.gov; TSA rules may change without notice and are subject to interpretation by individual TSA officers and international equivalents. This calculator is for planning purposes only; always verify with TSA or airline. TTB dual-label requirements per 27 CFR 4.38 (wine) and 27 CFR 5.38 (spirits) at TTB.gov. FDA cosmetics labeling per 21 CFR 701 at FDA.gov/cosmetics. Pediatric medicine dosing: always follow the prescribing physician or pharmacist's instructions and use the calibrated measuring device provided with the medication; never use kitchen utensils for medicine. For pediatric emergencies or dosing questions: contact your pediatrician or Poison Control at 1-800-222-1222. NIAAA standard drink at NIAAA.nih.gov. This tool does not constitute medical, pharmaceutical, legal, or travel advice.