US vs UK fluid ounces?

They differ! 1 US fl oz ≈ 29.5735 mL; 1 UK (imperial) fl oz ≈ 28.4131 mL. Recipes can yield different results if you swap them.

No. A US cup is 240 mL; an Imperial cup is 284 mL; a metric cup is 250 mL. We use the US cup here — the most common in published recipes.

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Convert volume across metric and US/UK units: milliliters, liters, US/UK gallons, US/UK fluid ounces, US cups, pints, quarts, and cubic meters.

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