Volume
mm³togal (US)
Convert cubic millimetres (mm³) to US gallons (gal (US)).
Factor1 mm³ = 2.641721e-7 gal (US)
Converter
mm³
Accepts numbers or expressions, e.g. 150 + 14.7
Result
gal (US)
Rendered to 6 significant figures.
Formula
Formula
gal (US) = mm³ × 2.641721e-7
Multiply any value in cubic millimetres by 2.641721e-7 to obtain the value in US gallons.
Worked example
Convert 1.00000e+6 mm³ to gal (US).
- 01Start with 1.00000e+6 mm³.
- 02Multiply by the conversion factor: 1.00000e+6 × 2.641721e-7 = 0.264172 gal (US).
Result1.00000e+6 mm³ = 0.264172 gal (US)
Conversion table
| mm³ | gal (US) |
|---|---|
| 1 | 2.6417e-7 |
| 2 | 5.2834e-7 |
| 5 | 1.3209e-6 |
| 10 | 2.6417e-6 |
| 20 | 5.2834e-6 |
| 50 | 1.3209e-5 |
| 100 | 2.6417e-5 |
| 200 | 5.2834e-5 |
| 500 | 0.00013209 |
| 1000 | 0.00026417 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from mm³ to gal (US)?
1 mm³ equals 2.641721e-7 gal (US). To convert, multiply the value in cubic millimetres by 2.641721e-7.
How do I convert 1 mm³ to gal (US)?
1 mm³ = 2.64172e-7 gal (US). For any value, multiply by 2.641721e-7.
How do I convert gal (US) back to mm³?
Divide by the same factor — or equivalently, multiply by 3785412. So 1 gal (US) = 3.78541e+6 mm³.
When would I need to convert cubic millimetre to US gallon?
Volume conversions are used for tank sizing, batch calculations, and bridging between vendor specs (gallons, barrels, ft³) and process documentation (m³, litres).
Is the conversion exact?
The factor shown is precise to at least 7 significant figures. For most process-engineering work this is far better than instrument accuracy. For metrology or trade applications, refer to the relevant national standard (NIST, BIPM, ISO 80000).