Hydroponicity
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Hydroponicity

A precision nutrient calculator for side-hustle growers. Research-grade math, an operator-friendly surface.

Free calculators

  • EC ↔ ppm converter
  • Fertilizer label decoder
  • Recipe solver

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  • Pricing
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  • Recipe Solver

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  • The engine shows its work
© 2026 HydroponicitySafety warnings and approximation caveats are free on every tier.
Free calculator · 1 free solve

Hydroponic nutrient recipe solver

Pick a crop target (or type your own ppm), choose your salts, and the engine solves how many grams of each to weigh out — hitting every element at once. This is the real solver, not a demo.

Free tier: one live solve with the full multi-salt engine. Source-water correction, ion balance, and saving are Pro — shown below as locked panels so you can see exactly what's behind them.

Target profile

Desired final concentration per element

Source-water correction

Subtract what's already in your water

Ca 62
Mg 18
S 22
Na 24
Cl 30
K 3
N 2
Pro

Source-water correction is a Pro feature

Unlock with Pro

Available fertilizers

9 of 9 salts in the solve

Set your targets and press Solve recipe.

The engine finds the grams of each salt that best hit every target at once — not one element at a time.