Calculators
Calcium
Calcium dosing calculator
How much to dose to raise your reef tank's calcium — with the 20 ppm/day safe limit built in. Every figure is sourced.
Unit
Use net water volume — subtract ~10–20% for rock and sand.
Add
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Correcting calcium? Get magnesium into range first — it is what lets your tank hold it.
This is the dose for right now. Reef Stability learns how fast your tank actually uses alkalinity, calcium and magnesium, and tells you whether your daily dose is keeping up — or when to leave it alone.
Coming soon to the App Store