Convert US fluid ounces to millilitres, litres, cups and imperial fluid ounces for recipes, labels, refills, classroom worksheets and quote notes, with allowance, rounding and a printable volume record.
Base US fluid ounces = fluid ounces + extra tablespoons ÷ 2. Millilitres = base US fluid ounces × 29.5735295625. Litres = millilitres ÷ 1,000. US cups = base US fluid ounces ÷ 8. Imperial fluid ounces = millilitres ÷ 28.4130625. Planning millilitres = millilitres × (1 + allowance percent ÷ 100).
For 8 US fluid ounces and no extra tablespoons, millilitres = 8 × 29.5735295625 = 236.5882365 mL. The same amount is 0.236588 L, 1 US cup and about 8.327 imperial fluid ounces before any allowance.
Master’s Tip: print whether the source says US fl oz or imperial fl oz. The abbreviation “oz” is often copied casually, but the US and imperial fluid-ounce volumes are different and weight ounces are a different measurement altogether.
Standard or basis: US customary liquid-volume conversion using 1 US fluid ounce = 29.5735295625 millilitres. This calculator is for recipes, product labels, refills, classroom records and practical volume notes, not medicine dosing, laboratory calibration, nutrition compliance or legal-for-trade measurement.
Methodology & Accuracy
CalculationTime pages are built around visible arithmetic: the formula, assumptions, worked example and practical limitations are shown so the result can be checked rather than simply trusted.
Base US fluid ounces = fluid ounces + extra tablespoons ÷ 2. Millilitres = base US fluid ounces × 29.5735295625. Litres = millilitres ÷ 1,000. US cups = base US fluid ounces ÷ 8. Imperial fluid ounces = millilitres ÷ 28.4130625. Planning millilitres = millilitres × (1 + allowance percent ÷ 100).
Standard or basis: US customary liquid-volume conversion using 1 US fluid ounce = 29.5735295625 millilitres. This calculator is for recipes, product labels, refills, classroom records and practical volume notes, not medicine dosing, laboratory calibration, nutrition compliance or legal-for-trade measurement.
Where a calculator follows a named legal, trade or industry standard, that standard is cited visibly. Otherwise the page uses transparent general arithmetic and states its limits.Master’s Tip: print whether the source says US fl oz or imperial fl oz. The abbreviation “oz” is often copied casually, but the US and imperial fluid-ounce volumes are different and weight ounces are a different measurement altogether.
One US fluid ounce is exactly 29.5735295625 millilitres.
Multiply US fluid ounces by 29.5735295625. For example, 8 US fl oz × 29.5735295625 = 236.5882365 mL.
No. A fluid ounce measures volume, while an avoirdupois ounce measures weight. Converting weight ounces to millilitres depends on the ingredient density.
No. A US fluid ounce is 29.5735295625 mL, while an imperial fluid ounce is about 28.4130625 mL. This page uses US fluid ounces as the main input and shows imperial fluid ounces as a comparison.
Print the source fluid ounces, extra tablespoons, exact millilitres, rounded millilitres, litres, cup and imperial-fluid-ounce cross-checks, allowance, formula, assumptions, page URL, date and notes about the recipe, label, refill or worksheet.
Fluid-ounce conversion is only simple after the unit family is named. US fluid ounces, imperial fluid ounces and weight ounces are commonly confused in recipes, labels and online notes, so a reliable record keeps the source unit and millilitre result together.
A liquid label may use fluid ounces, while a package weight may use ounces. The calculator treats the input as volume. If the source is a weight ounce, density is needed before a millilitre answer is meaningful.
Small recipe amounts may look similar, but larger refills, batches and product labels can drift if the wrong fluid-ounce basis is used. The printable record names the US basis and shows the imperial comparison separately.
Metric bottle sizes, classroom worksheets and many product labels use millilitres. Converting from fluid ounces with the exact basis visible makes the note easier to check, repeat and share.