Primary Conversion Formulas
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US Fluid Ounces
Divide millilitres by the 1959 legal international constant.
fl oz (US) = ML ÷ 29.5735295625
UK Imperial Ounces
Divide millilitres by the 1824 British imperial constant.
fl oz (UK) = ML ÷ 28.4130625
Ounces to Millilitres
Reverse conversion: multiply US fluid ounces by the constant.
ML = fl oz × 29.5735295625
Dry Weight Ounces
Multiply volume by ingredient density, then divide by 28.3495.
dry oz = (ML × ρ) ÷ 28.349523
Millilitres to Grams
Multiply millilitres by liquid or dry ingredient density in g/ML.
grams = ML × ρ (g/ML)
Cups, Quarts & Gallons
Standard liquid volume multipliers for large capacity recipes.
1 Cup = 8 oz | 1 Quart = 32 oz
Table of Official Conversion Constants
| Measurement Unit | Unit System | Exact Value in Millilitres (ML) | Legal Reference Standard |
|---|---|---|---|
| US Fluid Ounce (fl oz) | US Customary | 29.5735295625 ML |
NIST Handbook 44 / 1959 Agreement |
| UK Imperial Fluid Ounce (fl oz) | British Imperial | 28.4130625 ML |
UK Weights and Measures Act 1985 |
| Weight Ounce (dry oz) | Avoirdupois Mass | 28.349523125 grams |
International Avoirdupois Pound Standard |
| US Customary Cup | US Customary Volume | 236.5882365 ML |
8 US Fluid Ounces |
| US Liquid Quart | US Customary Volume | 946.352946 ML |
32 US Fluid Ounces (1/4 Gallon) |
| US Liquid Gallon | US Customary Volume | 3,785.411784 ML |
231 Cubic Inches |
| UK Imperial Gallon | British Imperial Volume | 4,546.09 ML |
160 UK Fluid Ounces |