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Enter barrels or gallons of beer into the calculator to convert to the other value.
Common Mistakes Quick tips
- Entering values in both fields. Fill exactly one: either barrels or gallons.
- Mixing systems: US beer barrel (31 US gal) vs UK beer barrel (36 Imperial gal), and US vs Imperial gallons.
- Confusing the 42-gallon oil barrel with the 31-gallon beer barrel.
- Rounding too aggressively—e.g., 1/6 bbl ≈ 5.167 US gal, not a flat 5.
When to Use This Calculator
- Planning keg orders for events by converting barrels to gallons served.
- Converting between US and UK beer trade units (barrels, gallons, liters).
- Estimating production volumes and comparing suppliers across regions.
Input Definitions
- Barrels — US beer barrel = 31 US gal (≈117.35 L); UK beer barrel = 36 Imperial gal (≈163.66 L).
- Gallons — US gallon = 3.785411784 L; Imperial gallon = 4.54609 L; liters are provided for metric reference.
- Conversions — US: galUS = bblUS × 31; UK: galImp = bblUK × 36. Reverse by dividing.
Barell to Gallons of Beer Formula
The following formulas convert beer barrels to gallons and back for both US and UK systems.
\quad \mathrm{gal_{US}} = 31\,\mathrm{bbl_{US}}\quad\quad \mathrm{bbl_{US}} = \frac{\mathrm{gal_{US}}}{31}
- US beer barrel (bblUS) = 31 US gallons ≈ 117.35 L.
- UK beer barrel (bblUK) = 36 Imperial gallons ≈ 163.66 L.
- US gallon (galUS) = 3.785411784 L; Imperial gallon (galImp) = 4.54609 L.
How do you convert barrels to gallons of beer? For US beer, multiply barrels by 31 to get US gallons; for UK beer, multiply barrels by 36 to get Imperial gallons.
How do you convert gallons of beer to barrels? Divide US gallons by 31 for US beer barrels; divide Imperial gallons by 36 for UK beer barrels.
Barrels to Gallons Conversion Table
| Barrels (US beer) | Gallons (US) |
|---|---|
| 1/8 | 3.875 |
| 1/6 | 5.167 |
| 1/4 | 7.750 |
| 1/3 | 10.333 |
| 1/2 | 15.500 |
| 2/3 | 20.667 |
| 3/4 | 23.250 |
| 1 | 31.000 |
| 1.25 | 38.750 |
| 1.5 | 46.500 |
| 1.75 | 54.250 |
| 2 | 62.000 |
| 2.5 | 77.500 |
| 3 | 93.000 |
| 4 | 124.000 |
| 5 | 155.000 |
| * US beer measure: 1 barrel = 31 US gallons. | |
Example Problem
Convert 2.5 US beer barrels to US gallons.
Use the US formula: gal = barrels × 31.
gal = 2.5 × 31 = 77.5 gal
