Aquarium pH & CO2 Calculator
Calculate CO₂ levels, target pH, and pH drop based on proven KH/pH relationships.
Step 1
What do you want to calculate?
Tip: For most users, CO₂ Level Check is the default. Target pH and Drop Helper are planning/diagnostics tools.
Step 2
Inputs
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Typical planted tanks: 2–8 °dKH
pH can shift quickly when CO₂ changes
Higher KH usually means less pH shift per CO₂
Common target: ~20–30 mg/L
Often higher in the morning / without CO₂
Measure during a stable CO₂ phase
If provided, we estimate CO₂ at baseline/target
Not a rule. Always watch livestock and oxygenation.
Step 3
Result
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INFO
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Advanced analysis model
Curve based on the classic KH/pH/CO₂ approximation: CO₂ (mg/L) = 3 × KH × 10^(7 − pH).
Drop checker: best with a 4 °dKH reference solution. Response time is often 30–120 minutes.
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