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Aquarium Calculators

Aquarium Gravel Calculator

Substrate needed for a tank at your chosen depth, in kilograms and litres.

Enter values

Results update as you type.

Result

Substrate needed

46.08 kg

Planted tanks want 6–8 cm at the back sloping to 3–4 cm at the front; bare-bottom or sand-only tanks need much less.

In litres
28.8
Depth
6 cm
Coverage area
0.48 m²
Bags to buy (5 kg)
10
Water volume it displaces
28.8 litres
Cost
$115.20

About the Aquarium Gravel Calculator

Substrate needed for a tank at your chosen depth, in kilograms and litres.

Also known as: substrate calculator aquarium, how much gravel for fish tank, sand for aquarium, aquasoil calculator.

How to use this calculator

  1. Enter tank length, tank width, substrate depth, substrate and the other fields.
  2. The result updates instantly as you type — press Calculate (or Enter) at any time.
  3. Review the breakdown shown under the main result.
  4. Use Copy result or Share to save the answer or send a link with your inputs.

Formula

litres = length × width × depth ÷ 1000, then × density

Worked example

Using the values pre-filled in the calculator above:

  • Tank length = 120 cm
  • Tank width = 40 cm
  • Substrate depth = 6 cm
  • Substrate: Gravel (1.6 kg/L)
  • Price per kg = 2.5

the calculator returns:

  • Substrate needed: 46.08 kg
  • In litres: 28.8
  • Depth: 6 cm
  • Coverage area: 0.48 m²