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US gallons to Liters (gal (US) to L)
Convert US gallons to liters: 1 gal (US) = 3.78541 L. Exact conversion factor, formula, 22-row table and worked examples, with JSON API and MCP access.
Formula
1 gal (US) = 3.78541 L
liters = US gallons × 3.785411784 — reverse: US gallons = liters × 0.2641720524
The factor is derived from the SI definitions of both units (base unit: L) as listed in NIST SP 811; results on this page are shown to 6 significant figures, the API returns up to 12.
Worked examples
- 5 gal (US) = 18.9271 L
- 12.5 gal (US) = 47.3176 L
- 100 gal (US) = 378.541 L
US gallons to liters conversion table
| US gallons (gal (US)) | Liters (L) |
|---|---|
| 1 | 3.78541 |
| 2 | 7.57082 |
| 3 | 11.3562 |
| 4 | 15.1416 |
| 5 | 18.9271 |
| 6 | 22.7125 |
| 7 | 26.4979 |
| 8 | 30.2833 |
| 9 | 34.0687 |
| 10 | 37.8541 |
| 15 | 56.7812 |
| 20 | 75.7082 |
| 25 | 94.6353 |
| 30 | 113.562 |
| 40 | 151.416 |
| 50 | 189.271 |
| 75 | 283.906 |
| 100 | 378.541 |
| 200 | 757.082 |
| 250 | 946.353 |
| 500 | 1892.71 |
| 1000 | 3785.41 |
FAQ
How many liters are in one gallon?
1 gal (US) = 3.78541 L. The factor comes from the SI definitions of both units (NIST SP 811 / BIPM), so it is exact or correct to at least 10 significant figures.
What is the formula to convert US gallons to liters?
Multiply the value in US gallons by 3.785411784: liters = US gallons × 3.785411784. For example, 5 gal (US) = 18.9271 L.
How do I convert liters back to US gallons?
Multiply by the inverse factor 0.2641720524 (US gallons = liters × 0.2641720524), or use the liters-to-US gallons page.
Related conversions
Machine access
- API:
GET https://tttkmbb.com/api/v1/convert?value=5&from_unit=gal_us&to_unit=L - MCP: server
https://tttkmbb.com/mcp, toolconvert_unitswith{"value":5,"from_unit":"gal_us","to_unit":"L"} - Markdown: https://tttkmbb.com/conversion/gallons-to-liters.md · JSON: https://tttkmbb.com/conversion/gallons-to-liters.json (add
?value=for a result) · Units: /api/v1/units?quantity=volume - OpenAPI operationId:
convert_units. Freshness:static. Authentication: none.