Fluid Ounces to mL Converter: US vs UK Fl Oz, Beverage Serving Decoder, Standard Drink Reference, and Common Bottle Size Guide
1 US fl oz = 29.5735295625 mL exactly. Convert fl oz to mL for beverages, recipes, cosmetics, medicine, and more. Three modes: single fl oz to mL, Beverage Decoder (container mL to fl oz servings with NIAAA standard drink calculator), or batch up to 20 values. US vs UK fl oz difference explained. Free PDF. WhatsApp share.
Fl Oz to mL
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Why Fluid Ounces to mL Is One of the Most Searched Volume Conversions in the United States
Pick up any imported shampoo, sunscreen, or perfume from a US drugstore shelf, and the label reads something like “3.4 fl oz (100 mL).” Open any European cocktail recipe, and the ingredients are listed in milliliters: 30 mL gin, 15 mL vermouth, 10 mL triple sec. Ask a US pediatrician how much infant formula to give a newborn, and the answer comes in mL: “Start with 30 mL per feeding.” Measure a prescription cough syrup, and the dose on the pharmacy label says 10 mL, but the measuring cup in the box is marked in teaspoons (and 1 US teaspoon = 5 mL by convention, though the exact volume is 4.92892 mL). In every one of these cases, fluid ounces and milliliters need to speak to each other, and they do not speak the same language.
The exact value: 1 US fluid ounce = 29.5735295625 mL. This is derived directly from the US gallon definition. The US gallon = 231 cubic inches (exact, US law). One inch = 2.54 centimeters (exact, NIST). Therefore 1 cubic inch = 2.54³ = 16.387064 mL. And 1 US gallon = 231 x 16.387064 = 3,785.411784 mL. Since 1 US gallon = 128 US fluid ounces (US customary), 1 US fl oz = 3785.411784 / 128 = 29.5735295625 mL. This is exact, not an approximation. Yet most everyday labels and many calculators use 30 mL for 1 fl oz (a 1.4% overstatement). For beverages, recipes, and casual use, 30 mL is fine. For laboratory measurements, pharmaceutical dosing, and precision recipe scaling, use 29.5735295625 mL. NIST unit conversions at NIST.gov.
The UK fluid ounce is different: 1 UK fl oz = 28.4130625 mL (from 4546.09 mL per UK Imperial gallon / 160 fl oz per UK gallon). The US fl oz is about 4.1% larger than the UK fl oz. This matters for bartenders using British cocktail recipe books, for wine importers working with UK shipping documents, and for anyone comparing UK and US nutrition label fluid ounce values. Alcohol and Tobacco Tax and Trade Bureau (TTB) beverage labeling requirements at TTB.gov. UK fl oz definition at legislation.gov.uk.
How This Three-Mode Fluid Ounces to mL Calculator Works for Beverages, Recipes, and Bulk Conversions
Mode 1: Single Fl Oz to mL
Enter any US fluid ounce value. Output: milliliters, teaspoons, tablespoons, and cups. The chart compares your input to four beverage reference sizes: the 1.5 fl oz spirits shot (44.36 mL), the 5 fl oz wine pour (147.87 mL), the 12 fl oz beer can (354.88 mL), and the 16 fl oz US pint (473.18 mL). Toggle the checkbox to switch to UK fluid ounces (28.4130625 mL each) for UK recipes or import label conversions. 16 presets cover the full range from a 0.33 fl oz perfume sample to a 40 fl oz malt liquor bottle.
Mode 2: Beverage Decoder (mL Container to Fl Oz Servings)
Enter the total container size in mL (e.g., 750 mL for a wine bottle) and the serving size in fl oz (e.g., 5 fl oz for a standard wine pour). Output: total fl oz and number of servings per container. Optional: enter ABV (alcohol by volume percentage) to calculate NIAAA standard drinks per serving. The chart shows your container size relative to eight common US beverage reference sizes. Reference table shows nearest standard beverage for quick identification. Useful for bartenders, sommeliers, event planners, and anyone comparing container sizes across metric and US customary units.
Mode 3: Batch Fl Oz to mL
Enter up to 20 fl oz values, one per line. Output: a table with mL, teaspoons, tablespoons, and cups for every value. Perfect for recipe developers scaling a cocktail menu from US fl oz to metric mL for a European publication, or for laboratory technicians converting a list of reagent volumes.
US Fluid Ounce vs UK Fluid Ounce: A Difference That Matters for Bartenders, Importers, and Recipe Developers
| Unit | mL | Relation to Gallon | Legal Basis | Where Used |
|---|---|---|---|---|
| US fl oz | 29.5735295625 mL | 1/128 US gallon | US gallon = 231 in³. NIST Handbook 44. | USA. US recipe books, TTB beverage labels. |
| UK fl oz | 28.4130625 mL | 1/160 UK Imperial gallon | UK Weights and Measures Act 1985. | UK, some Commonwealth. UK cocktail books. |
| Difference | 29.5735 / 28.4130 = 1.0408 (4.1% larger) | 128 US vs 160 UK fl oz per gallon | Always specify US or UK on international bar menus. | UK cocktail recipe in fl oz is smaller than same US measure. |
| 30 mL convention | 30.0000 mL | Approximation | Common on cosmetics, perfumes. NOT exact. | TTB allows rounding; pharma requires exact. |
Sources: US fl oz: NIST Handbook 44, NIST.gov. UK fl oz: UK Weights and Measures Act 1985, legislation.gov.uk. TTB beverage labeling: 27 CFR 4.38 (wine), 27 CFR 5.38 (spirits) at TTB.gov. The TTB requires both fl oz and mL on imported beverage labels.
Common US Beverage Sizes in Fl Oz and mL
| US Beverage / Container | US Fl Oz | mL | Standard Drinks (NIAAA) |
|---|---|---|---|
| US spirits shot (standard) | 1.5 fl oz | 44.36 mL | 1 std drink (at 40% ABV) |
| Small juice glass / baby bottle | 4 fl oz | 118.29 mL | N/A (juice) / N/A (formula) |
| Standard US wine pour | 5 fl oz | 147.87 mL | 1 std drink (at 12% ABV) |
| 8-oz glass of water / juice | 8 fl oz | 236.59 mL | N/A |
| Standard US beer can | 12 fl oz | 354.88 mL | 1 std drink (at 5% ABV) |
| US pint glass (craft beer) | 16 fl oz | 473.18 mL | 1.3 std drinks (at 5% ABV) |
| Standard US bottled water | 16.9 fl oz | 500 mL | N/A (labeled 500 mL = 16.9 fl oz) |
| Large fountain drink | 32 fl oz | 946.35 mL | N/A (Big Gulp = 32 fl oz) |
| Standard 750 mL wine bottle | 25.36 fl oz | 750 mL | 5 std drinks (at 12% ABV) |
| 1-liter spirits bottle | 33.81 fl oz | 1,000 mL | 22 std drinks (at 40% ABV) |
| Spirits handle (1.75 L) | 59.17 fl oz | 1,750 mL | 39 std drinks (at 40% ABV) |
Standard US drink definition per NIAAA: 14g pure alcohol = 1.5 fl oz of 40% spirits = 5 fl oz of 12% wine = 12 fl oz of 5% beer at NIAAA.nih.gov. Standard drink calculations are for informational purposes. Actual alcohol content varies by product.
Three Real US Examples: Miami Bartender Scaling a Cocktail Menu, Houston Parent Decoding Infant Medicine Labels, and New York Wine Importer Calculating Bottle Pours
Example 1: A Miami Beach Bartender Converting a European Cocktail Recipe from mL to US Fl Oz
Single batch: 45 mL gin = 45/29.5735295625 = 1.521 fl oz. 15 mL dry vermouth = 15/29.5735295625 = 0.507 fl oz. 30 mL Campari = 30/29.5735295625 = 1.014 fl oz. Total = 3.04 fl oz = 89.9 mL per serving.
Miami bartender Carlos is adding a Negroni to the menu at an upscale South Beach hotel bar. The recipe from a London cocktail publication specifies: 45 mL gin, 30 mL sweet vermouth, 30 mL Campari. His bar jiggers are calibrated in US fl oz. He needs to convert each ingredient.
Batch conversion: 45 mL = 45 / 29.5735295625 = 1.521 US fl oz (closest to 1.5 fl oz, or use a 1.5 fl oz jigger with a small top). 30 mL = 30 / 29.5735295625 = 1.014 US fl oz (essentially 1 fl oz). 30 mL = 1.014 fl oz. Simplified for bar use: 1.5 fl oz gin, 1 fl oz sweet vermouth, 1 fl oz Campari. This rounds 45 mL to 44.36 mL (1.5 fl oz) and each 30 mL to 29.57 mL (1 fl oz), a small but acceptable deviation. To be exact: use a 30 mL/1 fl oz jigger (the slight 0.43 mL excess over true fl oz is negligible at scale). For bulk batching 50 Negronis: 50 x 45 mL = 2,250 mL gin = 2.25 L = 76.08 fl oz. TTB batch cocktail recipe requirements at TTB.gov. FDA food labeling (for bottled cocktails): FDA.gov.
Example 2: A Houston Parent Decoding a Child’s Liquid Medicine Label in mL vs Teaspoons
Single: 5 mL = 5/29.5735295625 = 0.169 fl oz = 1 US teaspoon (by convention). 10 mL = 2 tsp. 15 mL = 3 tsp = 1 tbsp. 20 mL = 4 tsp. US medicine teaspoon = 5 mL exactly by US FDA convention (though exact metric tsp = 4.92892 mL).
Houston parent Amanda’s 3-year-old has been prescribed children’s ibuprofen. The pharmacist’s label says “give 100 mg / 5 mL, dose: 10 mL every 6-8 hours.” The medicine cup in the box is marked in both teaspoons and mL. She wants to understand how 10 mL relates to teaspoons and fl oz.
Single conversion: 10 mL = 10 / 29.5735295625 = 0.338 US fl oz. In teaspoons: 10 mL / 5 mL per tsp = 2 teaspoons. The dosing cup’s 2-teaspoon mark and 10 mL mark are the same volume. The “medicine teaspoon” in the US is legally defined as exactly 5 mL by the FDA for liquid oral dosage forms (21 CFR 201.10). This is NOT the same as the exact culinary teaspoon: 1/3 of a US tablespoon = 1/3 x 14.7867647813 mL = 4.92892159 mL. Always use the marked dosing syringe or cup rather than a kitchen teaspoon for children’s medicine. FDA medication guide: FDA.gov/consumers. Poison Control: 1-800-222-1222 or Poison.org.
Example 3: A New York Wine Importer Calculating Standard Pours and ABV Compliance for a Restaurant Account
Beverage Decoder: 750 mL wine bottle at 5 fl oz per pour = 25.36 fl oz total / 5 fl oz = 5.07 pours. At 14.5% ABV: standard drinks per 5 fl oz pour = 5 fl oz x 29.5735 mL x 0.145 x 0.789 / 14 = 1.52 standard drinks. Labeling: TTB requires 750 mL bottles labeled as “25.36 fl oz (750 mL).”
New York importer Rachel is presenting a bold Napa Cabernet (14.5% ABV) in 750 mL bottles to a Manhattan restaurant. The sommelier wants to know: how many pours per bottle at a 5 fl oz pour, what the standard drink count per pour is, and what the label must say in fl oz under TTB rules.
Beverage Decoder: 750 mL = 750 / 29.5735295625 = 25.360 fl oz. At 5 fl oz per pour: 25.360 / 5 = 5.07 pours per bottle (the last pour is slightly less than 5 fl oz). Standard drinks per 5 fl oz of 14.5% ABV: 5 fl oz x 29.5735 mL x 0.145 x 0.789 / 14 = 1.52 NIAAA standard drinks per glass. This is above the NIAAA 1 standard drink threshold, which is why pours of bold reds at restaurants are sometimes reduced to 4-4.5 fl oz. TTB label requirement (27 CFR 4.38): the 750 mL bottle must state “25.36 fl oz (750 mL)” on the label. Smaller containers (187 mL) = 6.32 fl oz. Magnum (1.5 L) = 50.72 fl oz = 10.14 pours at 5 fl oz. NIAAA standard drink at NIAAA.nih.gov. TTB wine labeling at TTB.gov.
Five Expert Tips: The 30 mL Myth, Baby Formula Measuring, Cosmetics Label Rounding, Bartender Jigger Sizes, and Pharmaceutical Dosing Precision
Tip 1: The 30 mL vs 29.57 mL Debate: Why Cosmetic Labels and Pharma Labels Give Different Answers
If you look at a 1 fl oz perfume bottle, the label will almost certainly say “30 mL.” If you look at a 1 fl oz children’s liquid medicine dosing cup or a 1 fl oz injectable medication vial, it will say “29.57 mL.” Both labels are legal in the US, but they reflect different standards. The FDA for cosmetics (21 CFR 701) permits rounding: a product labeled 1 fl oz (30 mL) is acceptable even though the exact value is 29.5735 mL, because 30 mL is the “net quantity declaration” rounded to the nearest whole milliliter. The FDA for pharmaceutical products (21 CFR 201) requires accuracy within 2% of labeled volume, and 30 mL / 29.5735 mL = 1.0144, which is a 1.44% overage, within that tolerance. But for laboratory reagents, USP (US Pharmacopeia) preparations, and clinical trial dosing, 29.5735 mL is the required value. FDA cosmetics labeling at FDA.gov/cosmetics. FDA pharma labeling at FDA.gov/drugs.
Tip 2: Baby Formula and Infant Feeding: Why mL Matters More Than Fl Oz for Newborn Measurements
Pediatricians, NICU nurses, and lactation consultants in the US use milliliters for infant feeding volumes because of their precision. The American Academy of Pediatrics (AAP) recommends starting newborns on 30 mL (1.01 fl oz) per feeding, increasing by 30 mL increments. A common measuring mistake: parents using “1 fl oz” (29.57 mL) when the guideline says “30 mL” are giving about 1.4% less. Not clinically significant at home. But in a NICU setting where a premature infant is receiving 5 mL (0.17 fl oz) every 3 hours via feeding tube, precision to 0.5 mL matters. Baby bottle markings: most US bottles mark both fl oz (outer scale) and mL (inner scale). When a pediatrician says “give 4 ounces,” they mean 4 fl oz = 118.29 mL. Some US baby bottles mark “4 oz” and “120 mL” at the same line, again using the 30 mL convention. AAP infant nutrition at HealthyChildren.org (American Academy of Pediatrics). USDA WIC infant formula guidelines at FNS.USDA.gov/wic.
Tip 3: US Bartender Jigger Sizes vs European Measure Sizes: Why Recipes Do Not Translate Directly
US bartenders use jiggers calibrated in fl oz. Standard US double jigger: 1.5 fl oz / 0.75 fl oz (44.36 mL / 22.18 mL). European “shot measure”: 25 mL (UK pub single) or 35 mL (UK large), or 40 mL (standard European cocktail measure). A European recipe calling for “1 shot (40 mL)” does NOT equal 1.5 fl oz (44.36 mL). The European 40 mL shot = 1.353 fl oz. A US recipe calling for 1.5 fl oz = 44.36 mL, NOT 40 mL. The difference is 4.36 mL per shot, which is 10.9% less than a US standard shot. Over a 50-cocktail service shift, that is 218 mL of spirits difference. At a $35/bottle spirits cost and 25 fl oz per bottle, that is a non-trivial inventory and pricing difference. TTB cocktail regulations at TTB.gov. UK measure regulations: UK Weights and Measures (Intoxicating Liquor) Order 1988, legislation.gov.uk.
Tip 4: TTB Dual-Label Requirements: Why Every Imported Bottle Shows Both Fl Oz and mL
Every wine, spirits, and malt beverage container sold in the US must declare its net contents in both metric (mL or L) and US customary (fl oz) per TTB regulations. 27 CFR 4.38 (wine): “Net contents must be stated in milliliters… and in a corresponding number of US fluid ounces.” 27 CFR 5.38 (distilled spirits): same dual-label requirement. So a 750 mL bottle must say “750 mL (25.36 fl oz).” A 375 mL bottle: “375 mL (12.68 fl oz).” A 1.75 L bottle: “1.75 L (59.17 fl oz).” A 50 mL mini: “50 mL (1.69 fl oz).” This is calculated using the exact 29.5735295625 mL per fl oz value, rounded to two decimal places. Non-compliance results in label rejection at TTB COLA (Certificate of Label Approval) review. TTB COLA requirements at TTB.gov/labeling. TTB regulations at eCFR.gov.
Tip 5: Cooking, Baking, and Recipe Scaling: When to Use fl oz vs mL for Precision
American home recipes use volume measures (fl oz, cups, teaspoons) while European recipes and professional pastry chefs use mass (grams) and volume (mL). When scaling: 1 fl oz = 29.5735 mL. 1 cup = 8 fl oz = 236.588 mL. 1 tablespoon = 0.5 fl oz = 14.787 mL. 1 teaspoon = 1/6 fl oz = 4.929 mL. For baking, where accuracy in leavening agents (baking powder, yeast) matters, a digital scale and mL measurement beats volumetric measurement. The USDA Agricultural Research Service Food Data Central database uses grams for all measurements. FDA nutrition labeling uses mL for liquids. But for cooking (as opposed to baking), the 30 mL approximation per fl oz is perfectly fine: nobody’s souffle fails because they used 30 mL instead of 29.574 mL of cream. USDA Food Data Central at FDC.nal.usda.gov. FDA nutrition labeling at FDA.gov/food.
Quick Reference: Common US Fl Oz Values Converted to mL
| US Fl Oz | mL (exact) | Common Beverage / Use |
|---|---|---|
| 1 fl oz | 29.574 mL | Single spirits shot. Perfume bottle (labeled 30 mL by convention). Eye drops. |
| 1.5 fl oz | 44.361 mL | Standard US spirits shot. NIAAA 1 standard drink (at 40% ABV). |
| 4 fl oz | 118.294 mL | Baby bottle. Small juice glass. 4 fl oz = 1/2 cup. |
| 5 fl oz | 147.868 mL | Standard US wine pour. NIAAA 1 standard drink (at 12% ABV). |
| 8 fl oz | 236.588 mL | 1 US cup. Standard glass of water. 8 fl oz = 16 tbsp. |
| 12 fl oz | 354.882 mL | Standard US beer can. NIAAA 1 standard drink (at 5% ABV). |
| 16 fl oz | 473.176 mL | US pint glass. 1 US pint. Large iced coffee. |
| 25.36 fl oz | 750.000 mL | Standard wine bottle. Spirits 750 mL bottle. 5 standard wine pours. |
| 33.814 fl oz | 1,000.000 mL | Exactly 1 liter. 1 L water/spirits bottle. Reference point. |
| 64 fl oz | 1,892.706 mL | Half gallon. Note: spirits “handle” = 1.75 L = 59.17 fl oz (NOT a true half-gallon). |
| 128 fl oz | 3,785.412 mL | 1 US gallon. 1 US gallon = 128 fl oz = 3,785.411784 mL (exact). |
Formula: mL = fl oz x 29.5735295625 (exact US fl oz). 1 US fl oz = 29.5735295625 mL. Source: NIST.gov. NIAAA standard drink definition at NIAAA.nih.gov. TTB beverage labeling at TTB.gov.
Frequently Asked Questions: Fluid Ounces to mL
Related Volume Calculators
Legal Disclaimer and Editorial Transparency
The Fl Oz to mL Converter on USCalculators.com is for educational and informational purposes only. Conversion formula: 1 US fl oz = 29.5735295625 mL exactly (derivation: 1 US gallon = 231 cubic inches x 16.387064 mL per cubic inch = 3,785.411784 mL; 1 US gallon = 128 fl oz; 1 fl oz = 3785.411784 / 128 = 29.5735295625 mL). Source: NIST Handbook 44 at NIST.gov. 1 UK fl oz = 28.4130625 mL (UK Weights and Measures Act 1985). Standard drink calculations per NIAAA at NIAAA.nih.gov: 1 standard US drink = 14g pure alcohol = 1.5 fl oz of 40% ABV spirits, 5 fl oz of 12% ABV wine, or 12 fl oz of 5% ABV beer. Actual alcohol content varies by specific product; always check label. Standard drink information is for informational purposes only and is not intended to constitute medical advice or to promote alcohol consumption. TTB dual-label requirements per 27 CFR 4.38 and 27 CFR 5.38 at TTB.gov. FDA pharmaceutical and cosmetic labeling at FDA.gov. Pediatric dosing: always follow pediatrician instructions and use the measuring device provided with the medication. Poison Control Center: 1-800-222-1222. This tool does not constitute medical, pharmaceutical, or legal advice.