CO₂ calculator from KH and pH
Work out dissolved CO₂ in a planted tank from KH and pH.
Dissolved CO₂19 mg/lIdeal for a planted tank.
How it’s calculated
Formula: CO₂ = 3 × KH × 10^(7 − pH). It’s reliable when KH comes only from carbonates; phosphates or humic acids skew it. A drop checker confirms the result.