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Volume is the most error-prone category here, because there are three gallons. The US liquid gallon is 3.785411784 L; the imperial gallon is 4.54609 L, a full 20% more. The same word means a fifth more liquid depending on which side of the Atlantic you are standing on, and fuel economy figures are the place this bites hardest.
Cooking measures differ too. A US cup is 236.588 mL, eight US fluid ounces, while the metric cup used in Australia and New Zealand is 250 mL and the traditional UK cup is 284 mL. Cubic units behave more predictably: one cubic foot is 28.3168 L and one cubic meter is exactly 1,000 L.
| mL | L | m³ | ft³ | gal | qt | cup | imp gal | |
|---|---|---|---|---|---|---|---|---|
| 1 mL | 1 | 0.001 | 1.0000e-06 | 3.5315e-05 | 0.000264 | 0.001057 | 0.004227 | 0.00022 |
| 1 L | 1000 | 1 | 0.001 | 0.035315 | 0.264172 | 1.056688 | 4.226753 | 0.219969 |
| 1 m³ | 1.0000e+06 | 1000 | 1 | 35.314667 | 264.172052 | 1056.688209 | 4226.752838 | 219.969248 |
| 1 ft³ | 28316.846592 | 28.316847 | 0.028317 | 1 | 7.480519 | 29.922078 | 119.688312 | 6.228835 |
| 1 gal | 3785.411784 | 3.785412 | 0.003785 | 0.133681 | 1 | 4 | 16 | 0.832674 |
| 1 qt | 946.352946 | 0.946353 | 0.000946 | 0.03342 | 0.25 | 1 | 4 | 0.208169 |
| 1 cup | 236.588236 | 0.236588 | 0.000237 | 0.008355 | 0.0625 | 0.25 | 1 | 0.052042 |
| 1 imp gal | 4546.09 | 4.54609 | 0.004546 | 0.160544 | 1.20095 | 4.8038 | 19.215199 | 1 |
How many liters are in a US gallon? 3.785411784 exactly. An imperial gallon is 4.54609 L, about 20% larger, so check which gallon a fuel-economy figure uses before converting it across countries.
How many cups are in a liter? About 4.23 US cups, since one US cup is 236.588 mL. Metric cups are larger at 250 mL, giving exactly four to the liter.
How many cubic feet are in a cubic meter? 35.3147. Because 1 m is 3.28084 ft, cubing that figure gives 35.3147 cubic feet per cubic meter. Going the other way, one cubic foot is 0.0283168 cubic meters.
Is a fluid ounce the same as an ounce? No. A fluid ounce measures volume, 29.5735 mL in the US and 28.4131 mL in the UK, while an ounce measures weight. They agree only for water.