Gallons to Cubic Meters Converter
1 US gallon is exactly 0.003785411784 cubic meters. To convert gallons to cubic meters, multiply by 0.003785411784.
Sources: NIST SP 811, NIST Handbook 44, BIPM SI Brochure, UK Weights and Measures Act 1985 Updated
Result
1 gal = 0.00378541 m³
How to convert gallons to cubic meters
cubic meters = gallons × 0.003785411784
1 US gallon is exactly 231 cubic inches. The cubic meter is the SI unit of volume. 1 imperial gallon is exactly 4.54609 liters.
The factor 0.003785411784 is exact, not a rounded value. Nothing is rounded until you choose how many decimals to show.
Worked example: 50 gal
- Start with the value in gallons: 50 gal.
- Multiply by 0.003785411784, because 1 gallon = 0.003785411784 cubic meters: 50 × 0.003785411784 = 0.1892705892 m³.
- Round to the precision you need: 0.19 m³ to two decimals.
Gallons to cubic meters chart
Gallons from 10 to 1,000 converted to cubic meters with the exact factor, shown to five significant digits.
| gal | m³ |
|---|---|
| 10 | 0.037854 |
| 20 | 0.075708 |
| 30 | 0.11356 |
| 40 | 0.15142 |
| 50 | 0.18927 |
| 60 | 0.22712 |
| 70 | 0.26498 |
| 80 | 0.30283 |
| 90 | 0.34069 |
| 100 | 0.37854 |
| 110 | 0.4164 |
| 120 | 0.45425 |
| 130 | 0.4921 |
| 140 | 0.52996 |
| 150 | 0.56781 |
| 160 | 0.60567 |
| 170 | 0.64352 |
| 180 | 0.68137 |
| 190 | 0.71923 |
| 200 | 0.75708 |
| 210 | 0.79494 |
| 220 | 0.83279 |
| 230 | 0.87064 |
| 240 | 0.9085 |
| 250 | 0.94635 |
| gal | m³ |
|---|---|
| 260 | 0.98421 |
| 270 | 1.0221 |
| 280 | 1.0599 |
| 290 | 1.0978 |
| 300 | 1.1356 |
| 310 | 1.1735 |
| 320 | 1.2113 |
| 330 | 1.2492 |
| 340 | 1.287 |
| 350 | 1.3249 |
| 360 | 1.3627 |
| 370 | 1.4006 |
| 380 | 1.4385 |
| 390 | 1.4763 |
| 400 | 1.5142 |
| 410 | 1.552 |
| 420 | 1.5899 |
| 430 | 1.6277 |
| 440 | 1.6656 |
| 450 | 1.7034 |
| 460 | 1.7413 |
| 470 | 1.7791 |
| 480 | 1.817 |
| 490 | 1.8549 |
| 500 | 1.8927 |
| gal | m³ |
|---|---|
| 510 | 1.9306 |
| 520 | 1.9684 |
| 530 | 2.0063 |
| 540 | 2.0441 |
| 550 | 2.082 |
| 560 | 2.1198 |
| 570 | 2.1577 |
| 580 | 2.1955 |
| 590 | 2.2334 |
| 600 | 2.2712 |
| 610 | 2.3091 |
| 620 | 2.347 |
| 630 | 2.3848 |
| 640 | 2.4227 |
| 650 | 2.4605 |
| 660 | 2.4984 |
| 670 | 2.5362 |
| 680 | 2.5741 |
| 690 | 2.6119 |
| 700 | 2.6498 |
| 710 | 2.6876 |
| 720 | 2.7255 |
| 730 | 2.7634 |
| 740 | 2.8012 |
| 750 | 2.8391 |
| gal | m³ |
|---|---|
| 760 | 2.8769 |
| 770 | 2.9148 |
| 780 | 2.9526 |
| 790 | 2.9905 |
| 800 | 3.0283 |
| 810 | 3.0662 |
| 820 | 3.104 |
| 830 | 3.1419 |
| 840 | 3.1797 |
| 850 | 3.2176 |
| 860 | 3.2555 |
| 870 | 3.2933 |
| 880 | 3.3312 |
| 890 | 3.369 |
| 900 | 3.4069 |
| 910 | 3.4447 |
| 920 | 3.4826 |
| 930 | 3.5204 |
| 940 | 3.5583 |
| 950 | 3.5961 |
| 960 | 3.634 |
| 970 | 3.6718 |
| 980 | 3.7097 |
| 990 | 3.7476 |
| 1,000 | 3.7854 |
cubic meters = gallons × 0.003785411784. Factors: NIST SP 811, NIST Handbook 44, BIPM SI Brochure, UK Weights and Measures Act 1985. unitcheck.net/volume/gallons-to-cubic-meters/
US gallon or imperial gallon?
The converter starts with the US gallon (3.785411784 L, defined through the US gallon of exactly 231 cubic inches). The imperial gallon used in the United Kingdom is 4.54609 L, about 20% larger. Use the switch above the converter if your number comes from a British source.
Frequently asked questions
How many cubic meters are in 1 gallon?
1 US gallon is exactly 0.003785411784 cubic meters. 1 US gallon is exactly 231 cubic inches.
How do I convert gallons to cubic meters?
Multiply by 0.003785411784: cubic meters = gallons × 0.003785411784. For example, 50 gal = 0.19 m³.
How many gallons are in 1 cubic meter?
1 cubic meter is about 264.172 US gallons. Press Swap on the converter to go the other way.
Is the gal to m³ conversion exact?
Yes. 1 US gallon is exactly 231 cubic inches. The factor 0.003785411784 follows from the definitions, so the only rounding is in the number of decimals you display.
Sources
- NIST Special Publication 811, Guide for the Use of the International System of Units, Appendix B.8: Factors for Units Listed Alphabetically — exact factors are printed in bold in the NIST table (checked October 12, 2026)
- NIST Handbook 44 (2026), Appendix C: General Tables of Units of Measurement — US customary units and their exact relationships (checked October 12, 2026)
- BIPM, The International System of Units (SI Brochure), 9th edition — defines the SI units, the prefixes and the units accepted for use with the SI
- Weights and Measures Act 1985 (UK), Schedule 1: Definitions of Units of Measurement — imperial gallon, pint and fluid ounce, stone and long ton (checked October 12, 2026)