Liquid Fertilizer Dilution Calculator

Enter your water volume and dilution rate to get the concentrate needed.

How to use

  1. Enter your values in the fields above.
  2. Press Calculate to see your result instantly.
  3. Use the Share button to copy a link to your result.

About this calculator

Concentrated liquid fertilizers — fish emulsion, kelp extract, synthetic blends like 20-20-20 — are almost never applied at full strength. The label gives a dilution rate (e.g. “1 tbsp per gallon” or “5 mL per liter”) that balances nutrient delivery against the risk of burning roots with too-strong a solution.

This calculator scales that ratio to whatever volume of water you're actually mixing, whether it's a 1-liter watering can or a 50-gallon sprayer tank. It's a practical tool for home gardeners, hydroponic growers, and greenhouse operators who need consistent, correctly diluted feed solutions without doing the ratio math by hand every time they mix a batch.

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