How do you convert gallons to cubic meters?

To convert gallons (gal (US)) to cubic meters (m³), multiply the volume in gallons by 0.00378541 (cubic meters = gallons × 0.00378541).

What is 5 gallons in cubic meters?

5 gallons (5 gal (US)) is equal to 0.01893 cubic meters (0.01893 m³).

Which is larger, 1 gallon (us liquid) (gal (US)) or 1 cubic meter (m³)?

One cubic meter (m³) is larger than one gallon (us liquid) (gal (US)). Specifically, 1 m³ equals 264.17205 gal (US), while 1 gal (US) is 0.00378541 m³.

How do I convert back from cubic meters (m³) to gallons (us) (gal (US))?

To reverse the calculation from m³ to gal (US), multiply your cubic meter value by the inverse factor 264.17205 (or divide by 0.00378541). You can also click the Swap button in the tool above to flip directions in one click.

How many decimal places should I round gal (US) to m³ results to?

For everyday comparisons and quick estimates, rounding to 2 decimal places is usually sufficient (for example, 5 gal (US) ≈ 0.02 m³). For engineering, laboratory, or machining specifications, select 4 or 6 decimals—or Scientific (10ⁿ) mode—in the calculator toolbar above.

Gallons to Cubic Meters Converter

Enter the volume in gallons below to convert it to cubic meters.

Cubic Meters to Gallons (US) (m³ → gal (US))

Convert Gallons (US) to Cubic Meters

Enter a value in gallons (us) (gal (US)) to convert to cubic meters (m³).

Value (gal (US))

From

Result

•

0.018927059cubic meters

5 gal (US) = 0.018927059 m³

Result updates automatically

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Equivalent Measurements Across UnitsFor 5 gal (US)

Milliliters18,927.05892 mL

Liters18.92706 L

Suggested Conversions

Reference:NIST OWM (SI Units — Volume)

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Gallon to Cubic Meter Conversion Table

Table showing various gallon measurements converted to cubic meters. Click any preset value or arrow to load it into the converter.

Gallons (US) (gal (US))	Cubic Meters (m³)
1 gal (US)	0.0037854 m³
2 gal (US)	0.0075708 m³
2.5 gal (US)	0.0094635 m³
5 gal (US)	0.0189271 m³
10 gal (US)	0.0378541 m³
15 gal (US)	0.0567812 m³
20 gal (US)	0.0757082 m³
25 gal (US)	0.0946353 m³
30 gal (US)	0.1135624 m³
50 gal (US)	0.1892706 m³

How to Convert Gallons to Cubic Meters

To convert gallons to cubic meters, multiply the volume by the following conversion ratio: 0.0037854 cubic meters/gallon.

Since one gallon is equal to 0.0037854 cubic meters, you can use this simple formula to convert:

cubic meters = gallons × 0.0037854

The volume in cubic meters is equal to the volume in gallons multiplied by 0.0037854.

For example, here's how to convert 5 gallons to cubic meters using the formula above.

cubic meters = (5 gal (US) × 0.0037854) = 0.0189271 m³

How Many Cubic Meters Are in a Gallon?

There are 0.0037854 cubic meters in a gallon, which is why we use this value in the formula above.

1 gal (US) = 0.0037854 m³|1 m³ = 264.1720524 gal (US)

Our gallon to cubic meter calculator automatically converts your volume measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.

Gallons and cubic meters are both units used to measure volume. Keep reading to learn more about each unit.

What Is a Gallon?

A gallon is a unit of volume equal to 3.7854118 liters (L), the base unit for volume. US liquid gallon defined as exactly 231 cubic inches (3.78541 L). [1]

The gallon is classified as a US customary unit of volume. Gallons can be abbreviated as gal (US); for example, 1 gallon can be written as 1 gal (US).

When working with gallons (gal (US)) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.

In practice, gallons (gal (US)) are widely used across standard volume applications within US customary workflows, engineering documentation, and technical data sheets.

Learn more about gallons in our Volume & Liquid Converter.

What Is a Cubic Meter?

A cubic meter is a unit of volume equal to 1,000 liters (L), the base unit for volume. SI coherent derived unit of volume equal to 1,000 liters. [2]

The cubic meter is classified as an International System of Units (SI) unit of volume. Cubic Meters can be abbreviated as m³; for example, 1 cubic meter can be written as 1 m³.

When working with cubic meters (m³) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.

In practice, cubic meters (m³) are widely used across large-scale industrial, bulk, and macro-level volume specifications within International System of Units (SI) workflows, engineering documentation, and technical data sheets.

Learn more about cubic meters in our Volume & Liquid Converter.

When converting volume between gallons (gal (US)) and cubic meters (m³), keep full floating-point precision (1 gal (US) = 0.0037854 m³; 1 m³ = 264.1720524 gal (US)) during intermediate calculations and round only the final cubic meter figure to match your instrument tolerance.

More Gallon & Cubic Meter Conversions

Need to calculate in the opposite direction? Use our cubic meters to gallons (us) calculator to switch your starting unit immediately. You can also explore related tools such as converting cubic meters to gallons (us), converting cubic feet to cubic meters, or converting gallons (us) to liters.

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Open Cooking & Ingredient Converter

Weight and volume require ingredient density (g/mL). Choose a USDA FoodData Central verified ingredient below:

Flour (125 g/cup)Granulated Sugar (200 g/cup)Brown Sugar (220 g/cup)Powdered Sugar (120 g/cup)Butter (227 g/cup)Rice (185 g/cup)Milk (244 g/cup)Water (236.6 g/cup)Honey (339 g/cup)Cooking Oil (218 g/cup)Salt (292 g/cup)

Frequently Asked Questions

There are 0.00378541 cubic meters (m³) in 1 gallon (gal (US)). Conversely, 1 cubic meter (m³) is equal to 264.17205 gallons (gal (US)).

Volume & Liquid Converter

Quick Info

Direct Factor: 1 gallon (us liquid) (gal (US)) equals 0.00378541 cubic meters (m³).
Inverse Factor: 1 cubic meter (m³) equals 264.17205 gallons (us) (gal (US)).
Formula: cubic meters = gallons (us) × 0.00378541.
Verified Precision: Anchored to official NIST SP 811 and ISO/IEC 80000 standards.

Units Comparison

Gallon (US Liquid) (gal (US))

US liquid gallon defined as exactly 231 cubic inches (3.78541 L).

Cubic Meter (m³)

SI coherent derived unit of volume equal to 1,000 liters.

Liter (L)

Metric unit of volume equal to 1 cubic decimeter (1,000 mL).

References

[1]NIST OWM · SI Units — Volume
Source
[2]NIST HB 44 · Liquid & Dry Capacity Tables
Source
[3]NIST SP 811 · NIST SP 811 App. B.9
Source

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References

NIST · BIPM · ISO

[1]
NIST OWM (SI Units — Volume)·Volume & Liquid Metrology Standard — Gallons (US) (gal (US)) to Cubic Meters (m³)
NIST OWM Standard
[2]
NIST HB 44 (Liquid & Dry Capacity Tables)·Unit Specifications: Gallon (US Liquid) (gal (US)) & Cubic Meter (m³)
NIST HB 44 Specification
[3]
NIST SP 811 (NIST SP 811 App. B.9)·Conversion Factors & Mathematical Basis (gal (US) to m³)
NIST SP 811 Reference

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