Gallons to Cubic Meters
Convert gallons (gal) to cubic meters (m³). Both measure capacity and volume, and the conversion comes up in cooking, chemistry, fuel work.
The Formula
``
cubic meters = gallons × 0.003785411784
gallons = cubic meters × 264.172052358
`
One gallon is 0.003785 cubic meters, and one cubic meter is 264.1721 gallons.
Conversion Table
| Gallons | Cubic Meters |
|---|---|
| 1 gal | 0.003785 m³ |
| 2 gal | 0.007571 m³ |
| 5 gal | 0.018927 m³ |
| 10 gal | 0.037854 m³ |
| 25 gal | 0.094635 m³ |
| 50 gal | 0.189271 m³ |
| 100 gal | 0.378541 m³ |
| 500 gal | 1.8927 m³ |
| 1,000 gal | 3.7854 m³ |
The Other Direction
| Cubic Meters | Gallons |
|---|---|
| 1 m³ | 264.1721 gal |
| 2 m³ | 528.3441 gal |
| 5 m³ | 1,320.86 gal |
| 10 m³ | 2,641.72 gal |
| 25 m³ | 6,604.3 gal |
| 50 m³ | 13,208.6 gal |
| 100 m³ | 26,417.21 gal |
| 500 m³ | 132,086.03 gal |
| 1,000 m³ | 264,172.05 gal |
What Each Unit Is
Gallons (gal) — the US liquid gallon: exactly 3.785411784 litres. The English wine gallon of 231 cubic inches, kept by the US after Britain moved on in 1824.
Cubic Meters (m³) — the volume of a cube one metre on each side, equal to 1,000 litres. The SI derived unit of volume.
A Sense of Scale
A US milk jug is 1 gallon- A car tank is 12–16 gallons
- US fuel economy is miles per gallon
- A cubic metre of water weighs 1 tonne
- Domestic gas and water are billed per m³
Precision
The factor 0.003785411784 is rounded. For engineering work carry more digits than the table above, and round only at the end — rounding at each step compounds.
Watch Out For
- The UK imperial gallon is 4.546 litres — 20% larger. A "gallon" without a country attached is ambiguous, and US MPG figures look worse when read as imperial.
In Code
`javascript
const gallonToCubicMeter = (value) => value * 0.003785411784;
``
Where This Conversion Comes Up
- Cooking
- Chemistry
- Fuel
- Beverages
- Medicine
How Many Decimals Do You Need?
Rounding the factor costs accuracy, and how much depends on the factor. Converting 137 gal with the factor truncated at each decimal place:
| Decimals kept | Factor | 137 gal becomes | Error |
|---|---|---|---|
| 0 | 0 | 0 | 100.0000% |
| 1 | 0 | 0 | 100.0000% |
| 2 | 0 | 0 | 100.0000% |
| 3 | 0.004 | 0.548 | 5.6688% |
| 4 | 0.0038 | 0.5206 | 0.3854% |
The right number of significant figures is set by your input, not by the converter. If you measured gallons to three significant figures, the answer in cubic meters is only good to three — writing more digits claims precision the measurement never had.