Calculation of carbon dioxide CO2 in the aquarium online calculator


Our online calculator will help you calculate the carbon dioxide CO2 in your aquarium.
Carbon dioxide (CO2) is essential aquarium plants for growth and full development.
This calculator calculates the carbon dioxide (CO2) based on your values of acidity and water hardness in the aquarium.

The pH value can affect the condition of the water in the aquarium, at low values the bacteria begin to die.
After that, ammonia and nitrite filled aquarium, which affect the condition of the aquarium inhabitants.
The high pH value in the aquarium has a negative impact in alkaline water will have large amount of ammonia.
The pH of the water in the aquarium can take values from 0 to 14.
Aquarium inhabitants can survive the reading of from 5 to 9.5, and live comfortably, without disease the indication: 6 to 8.


The tap water has a hardness not greater than 20 degrees.
Water hardness in the aquarium should be within a certain range, the range is 3-15 degrees, but it is better when for each and every performance will approximate to the natural conditions of their native waters.

An example of the hardness of the water to the tank inhabitants:
snails need hard water as in soft water they have destroyed the shell;
viviparous fish will feel good in 10;
neon when 6;
Sagittaria and fern at 10-14 degrees, etc.

Water hardness can be different degrees of intensity:
0-4 – very soft;
5-8 – soft;
9-16 – medium hardness;
17-32 – hard;
33 and more – very hard.

Indicate the acidity of water (pH):

Indicate the carbonate hardness of water (kH, degrees):


The content of carbon dioxide, CO2 (mg/l):