Spike's Calculators

Barrel - Feet


Calculate the volume, capacity, and surface area of a barrel. This calculator uses feet for measurements.

Barrels usually have rims (chimes) on the top and bottom.

The barrel's volume is calculated from inside measurements, and you must deduct the rims from your height measurement. The same applies to the surface area. Calculating the amount of wood in contact with the liquid inside the barrel, you must subtract the rim(s) from the height measurement.

Approximate weight of Fuel or Water
one US gallon of water = 8.34 pounds.
one US gallon of diesel fuel = 7.1 pounds
one US gallon of gas = 6 pounds


Top Diameter ft in
Mid Diameter ft in
Barrel Height ft in
Liquid Weight-Pounds per US Gallon lb/gal US


Barrel Volume:
In Cubic Feet ft³
In Cubic Inches in³
In Cubic Metres
Barrel Capacity:
In US Gallons gal US
In Imperial Gallons gal Imperial
In Litres L
Liquid Weight and Surface Area
Weight of Liquid lbs
Surface Area in Square Feet ft²
In Square Inches in²
In Square Millimetres mm²
In Square Metres


  1. the barrels' top diameter in feet
  2. the mid diameter
  3. the height of the barrel in feet (without the rims)
  4. the weight of the liquid in pounds per US gallon


  1. the volume of the barrel in cubic feet
  2. the volume in cubic inches
  3. the volume in cubic metres
  4. the barrels' capacity in US gallons
  5. the capacity in Imperial gallons
  6. the capacity in litres
  7. tank liquid weight based on lbs/gal US
  8. the surface area of the barrel in square feet
  9. the surface area in square inches
  10. the surface area in square millimetres
  11. the surface area in square metres

V= 𝝅H/15(3T²+8M²+4TM)
where V is the volume of the cone
𝝅 = 3.14159265
T the  top diameter divided by 2
M the mid diameter divided by 2
H the height of the barrel
one cubic foot (ft³) = 1728 cubic inches (in³)
one cubic foot (ft³) = 28316846.592 cubic millimetres (mm³)
one cubic foot (ft³) = 0.028316846592 cubic metres (m³)
one cubic foot (ft³) = 7.48051948051947 gallons (gal) US
one cubic foot (ft³) = 6.22883545904283 gallons (gal) Imperial
one square foot (ft²) = 144 square inches (in²)
one square foot (ft²) = 92903.04 square millimetres (mm²)
one square foot (ft²) = 0.09290304 square metres (m²)

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