CO₂ Bubble Rate Calculator
Calculate CO2 concentration from KH and pH values.
CO2 Bubble Count Calculator
Calculate CO2 from KH and pH values
Formula
CO2 (mg/L) = 3.0 × KH × 10^(7.0 - pH)How to Use
- 1Test your water — Measure KH (carbonate hardness) and pH using liquid test kits for accuracy.
- 2Enter KH and pH — Input the measured KH in dKH and pH value into the calculator.
- 3Read CO₂ level — The calculator shows your CO₂ concentration in mg/L (ppm).
- 4Adjust if needed — Aim for 20-30 ppm CO₂ for optimal plant growth without harming fish.
Frequently Asked Questions
What is the ideal CO₂ level for a planted tank?
20-30 mg/L (ppm) is ideal. Below 20 ppm, plants may not thrive. Above 30 ppm, fish may show signs of stress.
How does KH affect CO₂ readings?
CO₂ concentration is calculated from the relationship between KH and pH. Higher KH at the same pH means more CO₂ is dissolved.
Why is my drop checker yellow?
A yellow drop checker indicates CO₂ is above 30 ppm, which may be too high for fish. Reduce your bubble rate or increase surface agitation.
Can I use CO₂ with a low-tech tank?
Yes, but low-tech tanks usually rely on natural CO₂ from fish and organic matter. Injected CO₂ is typically used in high-light, high-tech setups.