Tank & Cylinder Calculators
These calculators are built for the moment you're standing next to an actual tank — checking fuel, water, chemical, or fill level — and need a volume number from a dip reading or a set of dimensions, not a trip back to a spreadsheet. Enter the shape and measurements once and get volume and fill percentage instantly, without unit conversion or estimating a curved tank as if it were a straight-sided box.
Tank & cylinder calculators
Tank Volume Calculator
Calculate the liquid volume of cylindrical, rectangular, or capped horizontal and vertical tanks from dimensions and fill height.
Tank shape, dimensions, fill height → volume, fill %
Tank Strapping Chart Calculator
Generate a full depth-to-volume chart (dip / gauge chart) for any tank shape, so a dipstick reading converts straight to gallons or litres. Download as CSV.
Tank shape, dimensions, increment → depth-to-volume table
Cylinder Volume Calculator
Solve for a cylinder's volume, radius, or height — enter any two known dimensions to get the third.
Any 2 of radius, height, volume → the third
How tank volume is actually measured in the field
Vertical, flat-bottomed cylindrical tanks are the easy case — volume rises in a straight line with fill height, so a percentage-full reading maps directly to a percentage-of-volume reading. The moment a tank lies on its side, that stops being true: a horizontal cylinder is fullest per inch of rise right at the middle and emptiest near the very bottom and very top, because you're measuring a circular segment, not a rectangle. That's why a 20% dip reading on a horizontal tank does not mean the tank is 20% full — the actual figure depends on the tank's radius and needs real geometry, not a linear guess.
Real-world tanks also rarely have flat ends. Many horizontal storage tanks use rounded (elliptical or hemispherical) heads or a conical/frustum bottom for drainage, each of which adds its own volume beyond the straight cylindrical section in the middle. Tank Volume Calculator handles these common shapes directly so you don't have to split the tank into pieces and add the volumes by hand.
These calculators show up constantly in agriculture (fuel and water tanks), chemical and food processing (mix and storage tanks), water treatment, and home heating-oil tanks — anywhere someone needs a fast, accurate volume or remaining-capacity figure from a dimension and a dip or sight-gauge reading.