Cargo & stability
Tank Capacity Calculator
Volume, fill percentage and ullage at a sounding, for rectangular and horizontal cylindrical tanks. Mass is shown when you enter a density.
Geometric volume of an ideal tank. Real tanks have frames, stiffeners, trim and list effects. The vessel's approved ullage and sounding tables always take precedence.
Method
Geometry first, then the vessel's tables.
The calculator gives the geometric volume of an ideal tank. Structure, trim, list and the approved sounding tables take precedence.
Prismatic tanks
Volume is length × breadth × liquid depth. Ullage is the air space above the liquid.
Cylindrical tanks
Partly filled horizontal cylinders use the circular-segment area at the fill height, times the length.
Custody and stability
Use the approved ullage and sounding tables for custody transfer, stability or cargo declarations.
Get in touch
Pair the volume with the cargo.
Cargo intake and stability checks use the same geometry on the deck.