Reef parameter conversions

Convert common reef values in seconds. Enter a number in either field to update the other.

KH / Alkalinity

Convert carbonate hardness between dKH and ppm (CaCO3).

dKH ppm (CaCO3)

Reference: 1 dKH = 17.848 ppm (CaCO3).

Convert salinity between ppt and specific gravity at 25°C (approx).

Salinity (ppt) Specific gravity (SG)

Reference: 35 ppt ≈ 1.026 SG at 25°C; temperature affects readings.

Keep your notes, measurements, and dosing plans together for a stable reef.