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US gallons to Imperial gallons (gal (US) to gal (UK))
Convert US gallons to imperial gallons: 1 gal (US) = 0.832674 gal (UK). Exact conversion factor, formula, 22-row table and worked examples, with JSON API and MCP access.
Formula
1 gal (US) = 0.832674 gal (UK)
imperial gallons = US gallons × 0.8326741846 — reverse: US gallons = imperial gallons × 1.200949926
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) = 4.16337 gal (UK)
- 12.5 gal (US) = 10.4084 gal (UK)
- 100 gal (US) = 83.2674 gal (UK)
US gallons to imperial gallons conversion table
| US gallons (gal (US)) | Imperial gallons (gal (UK)) |
|---|---|
| 1 | 0.832674 |
| 2 | 1.66535 |
| 3 | 2.49802 |
| 4 | 3.3307 |
| 5 | 4.16337 |
| 6 | 4.99605 |
| 7 | 5.82872 |
| 8 | 6.66139 |
| 9 | 7.49407 |
| 10 | 8.32674 |
| 15 | 12.4901 |
| 20 | 16.6535 |
| 25 | 20.8169 |
| 30 | 24.9802 |
| 40 | 33.307 |
| 50 | 41.6337 |
| 75 | 62.4506 |
| 100 | 83.2674 |
| 200 | 166.535 |
| 250 | 208.169 |
| 500 | 416.337 |
| 1000 | 832.674 |
FAQ
How many imperial gallons are in one gallon?
1 gal (US) = 0.832674 gal (UK). 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 imperial gallons?
Multiply the value in US gallons by 0.8326741846: imperial gallons = US gallons × 0.8326741846. For example, 5 gal (US) = 4.16337 gal (UK).
How do I convert imperial gallons back to US gallons?
Multiply by the inverse factor 1.200949926 (US gallons = imperial gallons × 1.200949926), or use the imperial gallons-to-US gallons page.
Related conversions
Machine access
- API:
GET https://tttkmbb.com/api/v1/convert?value=5&from_unit=gal_us&to_unit=gal_uk - MCP: server
https://tttkmbb.com/mcp, toolconvert_unitswith{"value":5,"from_unit":"gal_us","to_unit":"gal_uk"} - Markdown: https://tttkmbb.com/conversion/gallons-to-imperial-gallons.md · JSON: https://tttkmbb.com/conversion/gallons-to-imperial-gallons.json (add
?value=for a result) · Units: /api/v1/units?quantity=volume - OpenAPI operationId:
convert_units. Freshness:static. Authentication: none.