ConvBolt — Unit ConverterUS gallons to Cubic meters Converter
Converting US gallons to cubic meters is a multiplication by a fixed factor: 1 gal = 0.003785412 m³. The table below covers the values people look up most often, and the formula section shows exactly where that factor comes from.
Because one us gallon works out to 0.003785412 m³, the cubic meter is the far smaller unit of the two: a figure given in cubic meter always carries a smaller number than the same measurement in us gallon. A chart drawn in gal can hide that, so check which label the axis uses before you compare two readings.
When a container size is certified in cubic meters but you are dosing in US gallons, it pays to convert from the certified figure rather than from a rounded label.
The conversion factor used here is 0.003785412 m³ per us gallon (9 significant digits as shown). Kept to seven figures it covers professional measurement; if you round it to two or three decimals for a spreadsheet, the error scales with the input — at a value of 1,000 gal a factor rounded to three decimals can be off by a measurable amount. The reverse direction uses 264.1721 gal per m³, the exact reciprocal, so a round trip through both pages returns your original number.
US gallons to Cubic meters formula
Use this formula to convert any us gallon value to cubic meters:
Worked example: 100 gal × 0.003785412 = 0.3785412 m³.
US gallons to Cubic meters conversion table
| US gallons (gal) | Cubic meters (m³) |
|---|---|
| 0.5 gal | 0.001892706 m³ |
| 1 gal | 0.003785412 m³ |
| 2 gal | 0.007570824 m³ |
| 5 gal | 0.01892706 m³ |
| 10 gal | 0.03785412 m³ |
| 20 gal | 0.07570824 m³ |
| 50 gal | 0.1892706 m³ |
| 100 gal | 0.3785412 m³ |
| 500 gal | 1.892706 m³ |
| 1000 gal | 3.785412 m³ |
How to convert US gallons to cubic meters
Multiply the us gallon value by 0.003785412 to get the equivalent in cubic meters. This single factor works for every value in the table above and for anything else you need — there is no per-value adjustment, which is why a conversion table and a calculator always agree.
If you need the opposite direction, use the Cubic meters to US gallons converter instead of dividing by hand; both pages use the same source factors. For every other gal conversion in one place, see the gal conversion hub.
Frequently asked questions
How many cubic meters are in 1 us gallon?
1 us gallon = 0.003785412 m³.
What is 100 US gallons in cubic meters?
100 gal = 0.3785412 m³.
Is converting US gallons to cubic meters the same as cubic meters to US gallons?
No — the direction changes the multiplier. The reverse conversion (1 m³ = 264.1721 gal) is on the Cubic meters to US gallons page.
Related conversions
Try the ConvBolt Unit Converter for any other volume unit, browse the Volume conversions, or read our conversion guides.