Aquarium tank weight calculator

Add water mass to the tank, substrate and equipment for a filled-system estimate.

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Water volume (L)

Water density (kg/L)

More inputs and assumptions

Empty tank mass (kg)

Substrate, decor and equipment mass (kg)

Answer

…

Add water mass to the tank, substrate and equipment for a filled-system estimate.

More results

Precision and calculation record

Decimal places in numeric results and text downloads

Rounding changes displayed numbers, not the calculation. Text, fractions, matrices and CSV schedules keep their own formatting. Automatic keeps up to 12 significant digits, with money shown to cents where applicable.

Step-by-step calculation

Inputs are substituted below. Each line evaluates the next operation; intermediate values are displayed to 12 significant digits while the calculation uses full precision.

Saved scenario

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Formula and assumptions

Water mass = litres × supplied kg/L. Density is your assumption, not a measured saltwater or temperature correction. This is not a floor-load, stand-strength or glass-safety assessment.

Automatic precision shows numbers to 12 significant digits. Thousands separators such as 1,000 are accepted; use a dot for decimals.

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Updated 2026-09-26

Using Aquarium tank weight calculator

Add water mass to the tank, substrate and equipment for a filled-system estimate.

Water mass = litres × supplied kg/L. Density is your assumption, not a measured saltwater or temperature correction. This is not a floor-load, stand-strength or glass-safety assessment.

Next: Tank volume calculator

A worked example

Example inputs: water volume (l) = 100, water density (kg/l) = 1, empty tank mass (kg) = 20, substrate, decor and equipment mass (kg) = 10. Filled system mass (kg) = 130.

Before you use the result

Water mass = litres × supplied kg/L. Density is your assumption, not a measured saltwater or temperature correction. This is not a floor-load, stand-strength or glass-safety assessment.

Example results for water volume (l)

These examples use Water density (kg/L): 1; Empty tank mass (kg): 20; Substrate, decor and equipment mass (kg): 10. They are reference calculations, not recommended settings.

Water volume (L)	Filled system mass (kg)
50	80
100	130
200	230

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