Saltwater Calculator
Salt Mix Calculator
Calculate exactly how much reef salt to mix for your target salinity. Supports popular brands like Instant Ocean, Red Sea, and Fritz.
Water Volume
Salt Mix
Salt Needed
2.5
cups
599
grams
21.1
ounces
For 5 gallons of RO/DI water using Instant Ocean to reach SG 1.025
Mixing Tips
- Always add salt to water, never water to salt
- Mix with a powerhead for 15-30 minutes until fully dissolved
- Match temperature to tank before adding (76-78°F typical)
- Verify with a refractometer before use - these are estimates
- Let mix aerate for 24 hours for best results
Quick Reference
Fish Only
1.020-1.023
FOWLR
1.023-1.025
Reef Tank
1.024-1.026
NSW
1.025-1.026
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