Irrigation & Nutrition

Fertilizer Formulator

Custom fertilizer blend from raw salts (calcium nitrate, MKP, potassium nitrate). Salts are solved in sequence so cross-element contributions are netted out — K supplied by MKP and the N supplied by potassium nitrate are subtracted from the remaining targets so total N, P and K reconcile to your setpoints.

Available on Teams — start free

The Fertilizer Formulator needs a Teams plan or higher. Create a free account to get started, then upgrade when you need it.

Start free Already have an account? Sign in

How it calculates

Salts are solved in order (P → K → N) so shared elements are netted out: potassium nitrate’s N and MKP’s K are subtracted before sizing calcium nitrate and potassium nitrate.
Mass fractions assume calcium nitrate 15.5-0-0, MKP (KH₂PO₄) and potassium nitrate (KNO₃); verify against your specific product labels.

What you enter

Target N (ppm)
Target P (ppm)
Target K (ppm)
Tank Volume (L)

What you get

Calcium Nitrate (g)
MKP (g)
Potassium Nitrate (g)

Related calculators

All calculators