What's the difference between US and UK gallons?

US gallon = 3.785 L (231 in³). UK (imperial) gallon = 4.546 L. UK gallons are ~20% larger. Always specify which you mean.

How many teaspoons in a tablespoon?

3 teaspoons (US) = 1 tablespoon = 14.79 ml. Australian tablespoons are 20 ml (4 teaspoons). Pick the one matching your recipe's origin.

US legal cup = 240 ml. Metric cup (Australia, NZ, Canada) = 250 ml. US cooking cup = 236.6 ml. For precision, use ml.

Yes — 1 US fl oz = 29.5735295625 ml exactly, 1 US gal = 3.785411784 L exactly, 1 UK gal = 4.54609 L exactly.

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