Convert Oil Barrels to Firkins
Convert Oil Barrels (bbl) to Firkins (fir) instantly and accurately.
Conversion Formula
fir = bbl × 4.666666667
About Oil Barrels
An oil barrel (bbl) = exactly 42 US gallons ≈ 158.99 L - established by the Pennsylvania oil industry in the 1860s and now the global petroleum standard. Global oil production, OPEC quotas, and crude spot prices are all quoted in barrels or Mb/d (millions of barrels per day); world consumption ~100 Mb/d in 2024. 'Bbl' derives from the 'blue barrel' mark on petroleum containers. 1 bbl = 42 US gal ≈ 159 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
| Oil Barrels (bbl) | Firkins (fir) |
|---|---|
| 1 bbl | 4.66667 fir |
| 2 bbl | 9.33333 fir |
| 5 bbl | 23.3333 fir |
| 10 bbl | 46.6667 fir |
| 25 bbl | 116.667 fir |
| 50 bbl | 233.333 fir |
| 100 bbl | 466.667 fir |