Spike's Calculators



Calculate the volume, capacity, and surface area of a barrel. This calculator uses inches 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 in
Mid Diameter in
Barrel Height in
Liquid Weight-Pounds per US Gallon lb/gal US


Tank Volume:
In Cubic Inches in³
In Cubic Feet ft³
In Cubic Metres
Tank 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 Inches in²
In Square Feet ft²
In Square Millimetres mm²
In Square Metres


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


  1. the volume of the barrel in cubic inches
  2. the volume in cubic feet
  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 inches
  9. the surface area in square feet
  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 inch (in³) = 0.000578703703703704 cubic feet (ft³)
one cubic inch (in³) = 0.000016387064 cubic metres (m³)
one cubic inch (in³) = 0.00432900432900432 gallons (gal) US
one cubic inch (in³) = 0.00360465014990905 gallons (gal) Imperial
one cubic inch (in³) = 0.016387064 litres (L)

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