Construction/Home calculator
Tank Volume Calculator
Calculate cylindrical or rectangular tank capacity and filled volume in liters or gallons from dimensions and fill percentage.
FormulaCylinder volume = pi x (diameter / 2)^2 x length; rectangular volume = length x width x height
Formula
Tank capacity formula
Tank volume estimates are geometric planning values. Check manufacturer specifications for rated capacity and safe fill limits.
Cylinder volume = pi x (diameter / 2)^2 x length; rectangular volume = length x width x height
A 2 m diameter, 5 m long cylinder holds about 15,708 L; at 75% fill it contains about 11,781 L.
SourcesThis calculator includes source notes, assumptions, and exclusions so the result is easier to verify before use.
Sources and assumptions
Source notes
This calculator includes source notes, assumptions, and exclusions so the result is easier to verify before use.
- Effective year
- Current rules
- Last verified
- 2026-06-18
Tank volume estimates are geometric planning values. Check manufacturer specifications for rated capacity and safe fill limits.
Assumptions
- Cylinder mode uses full cylindrical capacity from diameter and length.
- Rectangular mode multiplies length, width, and height.
- Fill percentage is applied to total capacity.
Not included
- Exact partial-fill depth for horizontal cylinders, domed ends, baffles, wall thickness, usable drawdown, expansion space, fittings, and safety requirements.
FAQ6 common questions for this calculator.
FAQs
Can this calculate gallons?+
Yes. Switch to imperial units and the calculator converts cubic feet to US gallons.
Does this calculate liquid depth in a horizontal cylinder?+
No. It applies a fill percentage to total capacity. Exact liquid height in a horizontal cylinder uses segment geometry.
How does the Tank Volume Calculator calculate the result?+
For the Tank Volume Calculator, it uses the Tank capacity formula: Cylinder volume = pi x (diameter / 2)^2 x length; rectangular volume = length x width x height. A 2 m diameter, 5 m long cylinder holds about 15,708 L; at 75% fill it contains about 11,781 L.
What information do I need to use the Tank Volume Calculator?+
For the Tank Volume Calculator, enter dimensions and fill percentage. Keep the units consistent with the calculator fields and compare your setup with the worked example on the page.
How accurate is the Tank Volume Calculator?+
Tank Volume Calculator is a material estimate based on the dimensions, unit system, and allowance values entered. It uses the Tank capacity formula, but cuts, openings, site conditions, pack sizes, and code requirements can change the final quantity.
What should I check before using the Tank Volume Calculator result?+
For the Tank Volume Calculator, check dimensions and fill percentage, unit system, waste allowance, openings, site conditions, and supplier pack size. Use the estimate as a planning quantity before ordering materials.
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How to use the Tank Volume Calculator
Calculate cylindrical or rectangular tank capacity and filled volume in liters or gallons from dimensions and fill percentage. The page also explains the tank capacity formula and shows a practical example: A 2 m diameter, 5 m long cylinder holds about 15,708 L; at 75% fill it contains about 11,781 L.
- 1
Enter your details
Enter dimensions and fill percentage, then complete any other fields shown in the calculator.
- 2
Check the calculation
Review the result alongside the tank capacity formula: Cylinder volume = pi x (diameter / 2)^2 x length; rectangular volume = length x width x height.
- 3
Compare scenarios
Change one or more inputs to see how they affect the tank Volume Calculator result before you use the estimate.