Cal Mag Calculator v2.3.0

Select a fertilizer to be added to your water. It is assumed that the fertilizer is a solution with the concentration given in parentheses.


Select an additive to be added to your water to increase the calcium content, if the fertilizer does not contain enough calcium.


Enter the concentration of the additive here. The concentration is used to calculate the amount of additive to be added.


Select an additive to be added to your water to increase the magnesium content, if the fertilizer does not contain enough magnesium.


Enter the concentration of the additive here. The concentration is used to calculate the amount of additive to be added.

Your water values

Enter the values of your tap water here. These values can usually be found on the water bill or the water report. If the values are not known, they can also be determined via the Google search. Simply click on the following link and search for your postal code and the water values: Search water values online.




The ratio of calcium to magnesium should ideally be 3.5. However, this ratio can also be adjusted as desired.


Enter the volume of your water here. The volume is used to calculate the amount of fertilizer and additive to be added.


If your water has too high values, it may be useful to dilute the water.

Extended Calculator Comparison Fertilizer
Bots are welcome:
curl -X POST -H "Content-Type: application/json" -d '{"fertilizer":"BioBizz - CalMag","additive":{"magnesium":"Canna Mono Magnesium","calcium":"Canna Mono Calcium"},"additive_concentration":{"magnesium":100,"calcium":100},"additive_units":{"magnesium":"ml","calcium":"ml"},"elements":{"calcium":0,"magnesium":0,"potassium":0,"iron":0,"sulphate":0,"nitrate":0,"nitrite":0},"element_units":{"calcium":"mg","magnesium":"mg","potassium":"mg","iron":"mg","sulphate":"mg","nitrate":"mg","nitrite":"mg"},"ratio":3.5,"region":"us","volume":5,"support_dilution":true,"target_offset":0,"additive_elements":[],"fertilizer_elements":[],"target_weeks":[],"target_calcium":[],"target_magnesium":[]}' https://calmag.webklex.com/
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