Hydroponic Nutrient Solution Calculator

Work out hydroponic nutrient solution instantly with clear inputs, formula shown and shareable results.

About Hydroponic Nutrient Solution Calculator

A 100x A/B stock is designed to be diluted one part in a hundred to give full-strength feed. Stock needed = tank volume x target strength / concentration factor, and the balance is water. Seedlings and cuttings usually run at 40-60% strength, fruiting crops at 100-140%.

Formula

Nutrient dilution

Stock (L) = tank volume x target strength % / concentration factor; water = tank volume - stock

Worked example

With the default values below, Hydroponic Nutrient Solution Calculator returns Stock Solution To Add of 5.000. Change any input above and every figure here is recalculated in your browser.

Inputs used

Tank Volumeminimum 0.1 L: 500 L
Stock Solution Strengthminimum 1 x: 100 x
Target Feed Strengthaccepts 1–200 %: 100 %
Stock Solution Costminimum 0 per L: 180 per L

Results

Stock Solution To Add: 5.000
Water To Add: 495.00
Dilution Ratio (1 in n): 100.0
Cost Of The Tank: $900.00

Step by step

1Values used
2Nutrient dilution
3Stock Solution To Add= 5.000
4Water To Add= 495.00
5Dilution Ratio (1 in n)= 100.0
6Cost Of The Tank= 900.00

Assumptions and limits

The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
In particular, this calculator does not take inflation, tax or compounding frequency into account.
Figures are rounded for display to 3 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

Why are A and B stocks kept separate?

Concentrated calcium from stock A precipitates with sulphate and phosphate from stock B. They must only meet in the diluted tank, and each should be added to water separately with mixing between.

Should I dose by volume or by EC?

Dose by volume to get close, then verify and trim by EC and pH. EC alone cannot tell you whether the ratio of nutrients is right, so periodic lab analysis of the recirculating solution is still needed.