Reef Salt Mix Calculator
Free reef tank calculator
Estimate salt mix for your next batch
Choose the water amount and mixing rate printed on the product label.
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How Much Reef Salt Mix Do You Need?
Enter the amount of water you want to prepare and select the mixing rate printed on the salt manufacturer’s label. The calculator estimates cups, pounds, kilograms, package usage, and the approximate number of batches available from that package.
Salt mixes vary, so the product label—not a universal scoop size—should determine the starting amount. Add salt mix to RO/DI water while circulating the batch, follow the manufacturer’s mixing time, and test the finished water before it reaches your aquarium.
Always Verify the Finished Salinity
This reef salt calculator is a purchasing and preparation estimate. Temperature, measuring-cup accuracy, moisture, and product formulation can change the final salinity. Confirm every batch with a calibrated refractometer or conductivity meter and adjust gradually.
Use the aquarium water volume calculator to estimate how much water your system actually contains. Then follow our step-by-step saltwater aquarium water-change guide and compare options in the beginner reef salt mix guide.