Calculate the volume and capacity of a funnel tank.
The funnel tank here has the shape of an upside-down cone with a circular top that comes to a point. This calculator uses inches for measurements.

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 

Calculator

1. enter the diameter of the funnel tank in inches
2. the height of the funnel tank in inches
3. the weight of the liquid in pounds per US gallon

Results

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

Formula

V =𝝅R²h/3
where V is the volume of the tank
𝝅 = 3.14159265
R half the tanks' diameter
h the height of the tank

Conversions

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)