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Plan your water change batches. Based on the widely used figure of about 35 g of salt mix per liter to reach a specific gravity of 1.023 (at 25°C), scaled linearly for your target salinity.
RO/DI water you are mixing
Most reef tanks run 1.024–1.026
Enter the water volume and target salinity, then press Calculate.
Salt mixes differ between brands and batches. Always dissolve the salt fully in RO/DI or fresh water, aerate overnight, and verify salinity with a calibrated refractometer or hydrometer before adding to the tank. Never add dry salt directly to an aquarium.