How to Convert Cubic metres to US gallons (m³ to gal)
Volume conversions help with baking from American recipes, comparing petrol prices quoted per gallon abroad with pump prices per litre here, and reading PUB water bills in cubic metres. This guide shows how to convert cubic metres into us gallons by hand, with examples and a quick-reference table.
The conversion
To convert cubic metres to us gallons, multiply the value by 264.172176858. To go the other way, divide by the same number (or multiply by 0.00378541). For a quick estimate, multiply by about 260.
US gallons = cubic metres × 264.172176858
Worked examples
- 3 m³ = 792.5165 gal
- 12.5 m³ = 3,302.15 gal
- 75 m³ = 19,812.91 gal
Cubic metres to US gallons table
| Cubic metres | US gallons |
|---|---|
| 1 m³ | 264.1722 gal |
| 2 m³ | 528.3444 gal |
| 5 m³ | 1,320.86 gal |
| 10 m³ | 2,641.72 gal |
| 20 m³ | 5,283.44 gal |
| 25 m³ | 6,604.3 gal |
| 50 m³ | 13,208.61 gal |
| 100 m³ | 26,417.22 gal |
| 250 m³ | 66,043.04 gal |
| 500 m³ | 132,086.09 gal |
| 1,000 m³ | 264,172.18 gal |
Common questions
Is m³ to gal exact?
The factors used here are the internationally defined values where they exist; results are rounded for display only.
How do I convert back?
Use the US gallons to Cubic metres converter.
Mistakes to avoid
Rounding the factor too early
Using 3 instead of 3.28 for feet per metre introduces an error of almost 9% before you have started.
Dropping the units
A bare number without a unit is easy to misread later. Always write the unit with the result.
Mixing similar-sounding units
US and imperial gallons, pints and tons are different sizes, and decimal kilobytes differ from binary kibibytes.
Background
Singapore adopted the metric system in the 1970s, replacing imperial units and traditional Chinese measures in most official uses. Metric units are now standard in schools, trade and government, but older units survive in property, markets and imported goods.
Writing the units next to every number while you work is the simplest way to avoid mistakes. If the units do not cancel to leave the one you want, the calculation is set up wrongly.
A conversion table is handy for common values, but a calculator is faster and avoids interpolation errors for anything in between.
For any value, use the Cubic metres to US gallons Converter or browse all volume converters.
Run your own numbers: Cubic metres to US gallons Converter