O ― I
Beto's Reef
50 Gallon Lagoon
Stream
Gallery
Parameters
Journal
Calculators
Saltwater Calculators
Tools for mixing, testing, and maintaining your reef tank
Salinity Converter
Convert between specific gravity, salinity in ppt (‰), and PSU. Enter any one value to calculate the others.
Specific Gravity (SG)
Salinity (ppt / ‰)
PSU (Practical Salinity Units)
Enter a value above to convert
Salt Mix Calculator
How much Fritz RPM Reef Salt to add to fresh RO/DI water to reach your target salinity.
Volume of water
Gallons (US)
Litres
Target Salinity (ppt)
Starting Salinity (ppt) — use 0 for fresh RO/DI
Calculate
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US Cups
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Grams
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Pounds
Water Change Calculator
How much saltwater to prepare for a water change, and what salinity to mix it at to hit your target after the change.
Tank volume
Gallons (US)
Litres
Water change (%)
Current tank salinity (ppt)
Target salinity after change (ppt)
Calculate
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Remove
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Mix new water at (ppt)
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Fritz RPM needed
