Convert Imperial Gallons to Firkins
Convert Imperial Gallons (UK gal) to Firkins (fir) instantly and accurately.
Conversion Formula
fir = UK gal × 0.1334388806
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 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
| Imperial Gallons (UK gal) | Firkins (fir) |
|---|---|
| 1 UK gal | 0.133439 fir |
| 2 UK gal | 0.266878 fir |
| 5 UK gal | 0.667194 fir |
| 10 UK gal | 1.33439 fir |
| 25 UK gal | 3.33597 fir |
| 50 UK gal | 6.67194 fir |
| 100 UK gal | 13.3439 fir |