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Planted Tank CO2 Requirement Calculator
Estimate dissolved CO2 in an aquarium from pH and carbonate hardness and see if it reaches planted tank levels.
🐠 Free Online Tool
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Free Aquarium Tool
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Estimate dissolved CO2 in an aquarium from pH and carbonate hardness and see if it reaches planted tank levels.
Planted Tank CO2 Requirement Estimator
Enter your numbers below for an instant estimate.
0
💡 Tip: Use a drop checker and add CO2 gradually. Fish gasping at the surface means stop and aerate.
How It Works
Key concepts behind this calculator
1
Enter Values
Fill in each field with your own numbers.
2
Calculate
Results update as you change the inputs.
3
Review
Read the breakdown and the explanation.
4
Adjust
Change values to compare scenarios.
Quick Reference Guide
Planted Quick Guide
Typical values for reference.
| CO2 ppm | Level | Effect | Note |
|---|---|---|---|
| Under 10 | Very low | Algae risk | Add CO2 |
| 15 to 20 | Low | Slow growth | OK |
| 20 to 30 | Ideal | Lush plants | Target |
| Above 35 | High | Fish stress | Reduce |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
Planted Tank CO2 Calculator FAQ
Answers to common questions about this calculator.
About 20 to 30 ppm.
From pH and KH or a drop checker.
No, high CO2 harms fish.
Starting an hour before lights on.