Storage Tank Volume Calculator

Calculate volume for horizontal and vertical cylindrical tanks with partial fill levels

Tank Dimensions

Select tank orientation and enter dimensions

Measured from tank bottom
Measured from tank bottom

Volume Results

Enter tank dimensions and click Calculate

Measurement Tips

  • Always measure from the same reference point
  • For horizontal tanks, ensure tank is level
  • Account for bottom sludge/water layers
  • Use calibrated tank strapping tables for custody transfer

Formula Reference

Vertical Cylindrical Tank (Full)

Volume = PI x r^2 x h = PI x (D/2)^2 x H Where: D = diameter, H = height

Horizontal Cylindrical Tank (Partial Fill)

Circular Segment Area = r^2 x arccos((r-h)/r) - (r-h) x sqrt(2rh - h^2) Volume = Area x Length Where: r = radius, h = fill height, Length = tank length

Elliptical Head Volume (2:1 ratio)

Full Head Volume = (2/3) x PI x (D/2)^2 x (D/4) = (PI x D^3) / 24 Per head, multiply by 2 for both ends

Unit Conversions

  • 1 cubic foot = 7.4805 US gallons
  • 1 barrel (bbl) = 42 US gallons = 5.6146 cubic feet
  • 1 cubic meter = 264.172 US gallons = 6.2898 barrels