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Imperial gallons to US gallons (gal (UK) to gal (US))
Convert imperial gallons to US gallons: 1 gal (UK) = 1.20095 gal (US). Exact conversion factor, formula, 22-row table and worked examples, with JSON API and MCP access.
Formula
1 gal (UK) = 1.20095 gal (US)
US gallons = imperial gallons × 1.200949926 — reverse: imperial gallons = US gallons × 0.8326741846
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 (UK) = 6.00475 gal (US)
- 12.5 gal (UK) = 15.0119 gal (US)
- 100 gal (UK) = 120.095 gal (US)
Imperial gallons to US gallons conversion table
| Imperial gallons (gal (UK)) | US gallons (gal (US)) |
|---|---|
| 1 | 1.20095 |
| 2 | 2.4019 |
| 3 | 3.60285 |
| 4 | 4.8038 |
| 5 | 6.00475 |
| 6 | 7.2057 |
| 7 | 8.40665 |
| 8 | 9.6076 |
| 9 | 10.8085 |
| 10 | 12.0095 |
| 15 | 18.0142 |
| 20 | 24.019 |
| 25 | 30.0237 |
| 30 | 36.0285 |
| 40 | 48.038 |
| 50 | 60.0475 |
| 75 | 90.0712 |
| 100 | 120.095 |
| 200 | 240.19 |
| 250 | 300.237 |
| 500 | 600.475 |
| 1000 | 1200.95 |
FAQ
How many US gallons are in one imperial gallon?
1 gal (UK) = 1.20095 gal (US). 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 imperial gallons to US gallons?
Multiply the value in imperial gallons by 1.200949926: US gallons = imperial gallons × 1.200949926. For example, 5 gal (UK) = 6.00475 gal (US).
How do I convert US gallons back to imperial gallons?
Multiply by the inverse factor 0.8326741846 (imperial gallons = US gallons × 0.8326741846), or use the US gallons-to-imperial gallons page.
Related conversions
Machine access
- API:
GET https://tttkmbb.com/api/v1/convert?value=5&from_unit=gal_uk&to_unit=gal_us - MCP: server
https://tttkmbb.com/mcp, toolconvert_unitswith{"value":5,"from_unit":"gal_uk","to_unit":"gal_us"} - Markdown: https://tttkmbb.com/conversion/imperial-gallons-to-gallons.md · JSON: https://tttkmbb.com/conversion/imperial-gallons-to-gallons.json (add
?value=for a result) · Units: /api/v1/units?quantity=volume - OpenAPI operationId:
convert_units. Freshness:static. Authentication: none.