Convert Imperial Gallons to Acre-Feet
Convert Imperial Gallons (UK gal) to Acre-Feet (ac ft) instantly and accurately.
Conversion Formula
ac ft = UK gal × 3.685575143e-6
About Imperial Gallons
A US imperial gallon (UK gal) = exactly 8 imperial pints or 10 lb of pure water at 62°F ≈ 4.546 L - about 20% larger than the US liquid gallon (3.785 L). The weight-based definition made it verifiable with simple scales. Still the legal fuel measure in the Cayman Islands and other British Overseas Territories. UK mpg ratings use imperial gallons: 50 UK mpg ≈ 42 US mpg. 1 UK gal ≈ 4.546 L.
About Acre-Feet
An acre-foot (ac ft) = the volume covering 1 acre to 1 ft depth ≈ 1,233.5 m³ (325,851 US gal). Almost exclusively used in US water resource management. California's Lake Shasta: 4.55 million ac ft at capacity. A typical US household uses ~0.5-1 ac ft/year. Water rights on the Colorado and Sacramento rivers are traded in acre-feet. 1 ac ft ≈ 1,233.5 m³.
Quick Reference Table
| Imperial Gallons (UK gal) | Acre-Feet (ac ft) |
|---|---|
| 1 UK gal | 3.686 × 10-6 ac ft |
| 2 UK gal | 7.371 × 10-6 ac ft |
| 5 UK gal | 1.843 × 10-5 ac ft |
| 10 UK gal | 3.686 × 10-5 ac ft |
| 25 UK gal | 9.214 × 10-5 ac ft |
| 50 UK gal | 0.000184279 ac ft |
| 100 UK gal | 0.000368558 ac ft |