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Free tools
Free reef dosing calculators
Quick, sourced calculators — every figure traces to published chemistry, with the safe daily limits built in.
Most used
Alkalinity dosing calculator
Baking soda, soda ash, Red Sea, Seachem, Brightwell & more — with the safe daily limit built in.
Calcium dosing
Calcium chloride and commercial products.
Magnesium dosing
MgCl₂ / MgSO₄ — and why it comes first.
Salinity & specific gravity
Convert ppt ↔ SG, with the reef target.
Alkalinity units
dKH ↔ meq/L ↔ ppm CaCO₃.
Free calculators are the start. Reef Stability learns how fast your tank actually uses alkalinity, calcium and magnesium — and tells you when your daily dose needs to change, or when to leave it alone.
Coming soon to the App Store