Salt Mix Calculator
Calculate salt mix needed for your marine aquarium.
Salt Mix Calculator
Calculate salt mix for your marine aquarium
Formula
Salt = (Volume in Gallons) × (Grams/Gallon) × Salinity FactorHow to Use
- 1Enter water volume — Input the amount of water you need to mix in gallons or liters.
- 2Set target salinity — Choose your desired salinity or specific gravity (typically 1.025 sg / 35 ppt).
- 3Get salt amount — See exactly how many cups or grams of salt mix to add.
- 4Mix and verify — Mix thoroughly, aerate, and verify with a refractometer before use.
Frequently Asked Questions
What salinity should a reef tank be?
Most reef tanks should be maintained at 35 ppt (1.025-1.026 specific gravity). Fish-only tanks can be kept slightly lower at 30-33 ppt.
How much salt per gallon of water?
Most salt mixes require about ½ cup per gallon to achieve 35 ppt. Exact amounts vary by brand — always measure with a refractometer.
Can I use table salt for aquariums?
No. Table salt contains anti-caking agents and iodine that can harm marine life. Use only marine aquarium salt mix.
How long should I mix saltwater before using it?
Mix and aerate for at least 24 hours before adding to your tank. This ensures the salt fully dissolves and stabilizes.