Convert US Gallon to Cubic Meter
Convert us gallons to cubic meters instantly. 1 us gallon = 0.0037854118 cubic meter — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Cubic Meter to US Gallon converter for the reverse conversion.
Units explained
US Gallon
The US liquid gallon is defined as exactly 231 cubic inches (3.785411784 liters).
Based on the English wine gallon of 231 cubic inches, retained by the US after 1824.
The primary US unit for fuel, milk and large beverage containers.
English wine gallon; US since 1824.
Cubic Meter
The cubic meter is the SI derived unit of volume: the volume of a cube one meter on each edge. It is the anchor for all volume conversions.
Defined from the meter, the SI base unit of length, fixed by the speed of light since 1983.
The standard scientific and industrial unit of volume worldwide; used for water, gas, concrete and freight.
SI base derivation.
US Gallon to Cubic Meter conversion formula
The relationship between us gallons and cubic meters:
To convert us gallons to cubic meters, multiply the value in us gallons by 0.0037854118. To reverse, multiply cubic meters by 264.1720523581.
How to use this converter
Type a value into the calculator. The result in cubic meters updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Cubic Meter to US Gallon converter for the reverse direction.
Step-by-step: convert us gallons to cubic meters
- Write down the value in us gallons (gal).
- Multiply that value by the factor 0.0037854118.
- The product is the equivalent value in cubic meters (m³).
- To reverse, multiply the cubic meter value by 264.1720523581.
Worked examples
Example 1 — Convert 1 gal to m³:
1 × 0.0037854118 = 0.0037854118 m³
Example 2 — Convert 100 gal to m³:
100 × 0.0037854118 = 0.3785411784 m³
Real-world example — Children's height milestones
A 150-us gallon-tall child measures a value in cubic meters that's commonly used for theme-park ride height requirements when travelling between countries that use different measurement units.
150 gal × 0.0037854118 = 0.5678117676 m³
Real-world example — Body height conversion
You enter your height as 180 us gallons into an international job or visa application. The form then asks for the same value in cubic meters — converting between these adjacent units is one of the most-used length conversions globally.
180 gal × 0.0037854118 = 0.6813741211 m³
Real-world example — Furniture and large objects
A 72-us gallon piece of furniture converts to a value in cubic meters that's easier to mentally compare with room dimensions. This is the typical workflow when shopping internationally and product specs use a different unit than your room measurements.
72 gal × 0.0037854118 = 0.2725496484 m³
US Gallon to Cubic Meter conversion table
Standard reference values for converting us gallons to cubic meters:
| US Gallon [gal] | Cubic Meter [m³] |
|---|---|
| 0.01 | 3.785412e-5 |
| 0.1 | 0.0003785412 |
| 1 | 0.0037854118 |
| 2 | 0.0075708236 |
| 3 | 0.0113562354 |
| 4 | 0.0151416471 |
| 5 | 0.0189270589 |
| 10 | 0.0378541178 |
| 20 | 0.0757082357 |
| 30 | 0.1135623535 |
| 40 | 0.1514164714 |
| 50 | 0.1892705892 |
| 100 | 0.3785411784 |
| 500 | 1.892705892 |
| 1000 | 3.785411784 |
Frequently asked questions
How many cubic meters is 1 us gallon?
How do I convert us gallons to cubic meters?
How do I convert cubic meters back to us gallons?
How many cubic meters is 100 us gallons?
Popular volume unit conversions
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Metric / SI (15 units)
US Customary (Liquid) (14 units)
US Customary (Dry) (5 units)
Imperial (UK) (14 units)
Cubic (length-derived) (4 units)
Cooking / Culinary (5 units)
Sources & references
Conversion factor (1 gal = 0.0037854118 m³) verified against the following authoritative sources:
- BIPM — The International System of Units (SI Brochure 9th ed.)
Official BIPM publication defining the seven SI base units (including the meter) and the rules for their use. The global authority on units of measurement.
- NIST — Guide to the SI
US National Institute of Standards and Technology reference covering the SI base and derived units with definitions and usage rules for US technical practice.
- NIST Special Publication 811 — Guide for the Use of the International System of Units
Detailed NIST guide covering exact conversion factors between SI and US customary units along with formatting and rounding conventions.
- NIST — Refinement of values for the yard and pound (Federal Register 1959)
The treaty (signed by US
- International Astronomical Union — System of Astronomical Constants
The IAU defines astronomical units including the AU (149597870700 m exactly) light-year and parsec used in astronomy and astrophysics.