Free Tank Capacity to Weight Calculator - Volume & Liquid Weight
Calculate the volume and weight of liquid in a cylindrical, rectangular, or custom tank in gallons, litres, kilograms, pounds, and tons.
Formula & Methodology
The calculator derives tank volume from its geometry, converts to litres, and multiplies by liquid density to report weight in kilograms, pounds, and tons.
- Cylinder Volume = π × r² × length
- Rectangular Volume = length × width × height
- Weight (kg) = Volume in Litres × Density (kg/L)
Worked Example
Using the Tank Capacity to Weight Calculator: apply the formula above to your input values. For instance, Cylinder Volume = π × r² × length, then Rectangular Volume = length × width × height. The tool performs each step instantly and shows the result.
Frequently Asked Questions
How do I calculate the weight of liquid in a tank?
First find the tank volume from its shape and dimensions, convert to litres, then multiply by the liquid density in kg/L to get the weight in kilograms.
How is a cylindrical tank volume calculated?
Volume equals pi times the radius squared times the length or height. This tool computes it automatically from the diameter and length you enter.
Can I enter a tank volume directly?
Yes. Choose "Custom Volume" and enter the capacity in litres, gallons, cubic meters, or cubic feet if you already know it.
Why does a full water tank feel so heavy?
Water weighs about 1,000 kg per cubic meter, so even a modest tank holds tonnes of liquid — a key factor in structural and transport planning.
Does tank shape change the weight?
Shape changes the volume, and volume changes the weight. Two tanks of equal footprint can hold very different amounts depending on their geometry.
Can I use it for fuel or chemicals?
Yes. Select the liquid or enter a custom density in kg/L, kg/m³, or lb/ft³ for fuels, chemicals, or specialty fluids.