Cubic Millimeter to Gallon (US) Converter

Volume Converter

40 units available

Decimals:

From

To

2.641721e-7

1 mm³ = 2.641721e-7 gal

Formula:

gal = mm³ × 2.641721e-7

With your value: 1 mm³ = 2.641721e-7 gal

How big is that?

Everyday references on a logarithmic scale, all expressed in cubic millimeter so you can sanity-check the result.

Your value1.00 mm³

Teaspoon (5.0× your value)5.00 mm³

Espresso shot (30× your value)30.0 mm³

Soda can (3.3e+2× your value)330 mm³

Milk carton (1.0e+3× your value)1.00e+3 mm³

Kitchen bucket (1.0e+4× your value)1.00e+4 mm³

Other Cubic Millimeter to Gallon (US) conversions

2 mm³ to gal 3 mm³ to gal 4 mm³ to gal 5 mm³ to gal 6 mm³ to gal 7 mm³ to gal 8 mm³ to gal

Cubic Millimeter to Gallon (US) Conversion Table

Cubic Millimeter (mm³)	Gallon (US) (gal)
0.5	1.320860e-7
1	2.641721e-7
2	5.283441e-7
5	1.320860e-6
10	2.641721e-6
15	3.962581e-6
20	5.283441e-6
25	6.604301e-6
50	1.320860e-5
100	2.641721e-5
250	6.604301e-5
500	0.000132
1000	0.000264

Gallon (US) to Cubic Millimeter Conversion Table

Gallon (US) (gal)	Cubic Millimeter (mm³)
0.5	1,892,705.892
1	3,785,411.784
2	7,570,823.568
5	18,927,058.92
10	37,854,117.84
15	56,781,176.76
20	75,708,235.68
25	94,635,294.6
50	189,270,589.2
100	378,541,178.4
250	946,352,946
500	1,892,705,892
1000	3,785,411,784

Where these values come from

Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.

Cubic Millimeter (mm³)

Volume

Exact conversion

Derived from the cubic metre. The litre is exactly 10⁻³ m³; US and imperial capacity units are exact multiples fixed by statute.

Source: NIST Special Publication 811, Guide for the Use of the International System of Units

National Institute of Standards and Technology (US) · Reviewed 2026-07-01

Gallon (US) (gal)

Volume

Exact conversion

The US liquid gallon is exactly 231 cubic inches = 3.785 411 784 L.

Source: NIST Handbook 44, Specifications, Tolerances, and Other Technical Requirements for Weighing and Measuring Devices

National Institute of Standards and Technology (US) · Reviewed 2026-07-01

How to Convert Cubic Millimeter to Gallon (US)

To convert from Cubic Millimeter (mm³) to Gallon (US) (gal), multiply the value by 2.641721e-7.

Formula: gal = mm³ × 2.641721e-7

Reverse: mm³ = gal × 3,785,411.784

Step-by-Step Example

Start with your value in Cubic Millimeter. For example: 5 mm³
Multiply by the conversion factor: 5 x 2.641721e-7
The result is: 1.320860e-6 gal

About Cubic Millimeter

The cubic millimeter (mm³) is a unit of volume and capacity. One cubic millimeter equals 1.000000 × 10^-6 litres. UnitConvertLab converts it against every other volume unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.

Common uses: volume calculations, engineering and science, education.

About Gallon (US)

The US gallon equals approximately 3.785 liters and is the standard unit for fuel and large liquid volumes in the United States.

Fun Fact: The US gallon is about 20% smaller than the imperial (UK) gallon.

Common uses: fuel (US), beverages, swimming pools.

Frequently Asked Questions

How many Gallon (US) are in 1 Cubic Millimeter?

There are exactly 2.641721e-7 Gallon (US) in 1 Cubic Millimeter. This means the conversion factor from Cubic Millimeter to Gallon (US) is 2.641721e-7.

What is the formula to convert Cubic Millimeter to Gallon (US)?

The formula to convert Cubic Millimeter to Gallon (US) is: gal = mm³ × 2.641721e-7. For example, to convert 10 Cubic Millimeter to Gallon (US), you would multiply 10 by 2.641721e-7.

What is a Cubic Millimeter?