Skip to content
Calculator Tools
Aquarium Calculators

Aquarium Salt Dosage Calculator

Salt needed for a marine tank or a freshwater salt treatment, at any concentration.

Enter values

Results update as you type.

Result

Salt needed

7 kg

In grams
7,000
Dose rate
35 g/L
Specific gravity
1.0263
Salinity
35 ppt
In tablespoons (approx)
411.8
Per 10 litre bucket
350 g

About the Aquarium Salt Dosage Calculator

Salt needed for a marine tank or a freshwater salt treatment, at any concentration.

Also known as: marine salt calculator, aquarium salt dose, salinity calculator, specific gravity salt.

How to use this calculator

  1. Enter purpose, water volume.
  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

salt = target concentration × water volume

Worked example

Using the values pre-filled in the calculator above:

  • Purpose: Marine tank
  • Water volume = 200 litres
  • Target salinity = 35 ppt

the calculator returns:

  • Salt needed: 7 kg
  • In grams: 7,000
  • Dose rate: 35 g/L
  • Specific gravity: 1.0263