Estimate dry marine salt for a target salinity and water volume.
Open live calculator →100 litres at 35 ppt begins with an approximate 3.5 kg salt estimate.
Starting estimate only—verify with the salt label and a calibrated instrument.
Create a starting estimate for marine salt mix before confirming salinity with a calibrated refractometer and the product instructions.
The live tool updates immediately and shows the result in the units commonly used by aquarium keepers around the world.
Always follow the salt brand's mixing chart.
Measure after the mix fully dissolves and stabilises.
Never add dry salt directly onto livestock.
At a typical reef salinity of 35 ppt you need roughly 3.5–4 kg of salt mix per 100 litres, but brands differ—always follow the manufacturer's chart and verify with a calibrated refractometer.
No. Mix salt in a separate container with heated, circulating RO water, let it dissolve fully and stabilise, then confirm salinity and temperature before adding it to the system.
Reef tanks usually run 33–35 ppt (specific gravity about 1.025–1.026); fish-only systems are sometimes kept slightly lower. Stability matters more than the exact point you choose.