Convert Acre-Feet to Firkins
Convert Acre-Feet (ac ft) to Firkins (fir) instantly and accurately.
Conversion Formula
fir = ac ft × 36205.71429
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.
About Firkins
A firkin (fir) ≈ 34.07 L (9 US gallons) - the most common cask for British real-ale delivery (9 imperial gallons = 40.91 L). A busy pub cellar cycles through several firkins per week. Craft breweries stage 'firkin tappings' of limited experimental ales. The name comes from Middle Dutch 'vierdekijn' (little fourth), as a firkin was one quarter of a barrel. 1 fir = 9 US gal ≈ 34.07 L.
Quick Reference Table
| Acre-Feet (ac ft) | Firkins (fir) |
|---|---|
| 1 ac ft | 36205.7 fir |
| 2 ac ft | 72411.4 fir |
| 5 ac ft | 181029 fir |
| 10 ac ft | 362057 fir |
| 25 ac ft | 905143 fir |
| 50 ac ft | 1810290 fir |
| 100 ac ft | 3620570 fir |