Fertilizer NPK Calculator

Calculate the actual nitrogen, phosphorus, and potassium content from a fertilizer NPK ratio and application weight.

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Nitrogen – Phosphorus – Potassium

Fertilizer NPK Calculator

NPK numbers on a fertilizer bag represent the percentage by weight of nitrogen (N), phosphorus (P₂O₅), and potassium (K₂O). A 10-10-10 fertilizer contains 10% of each nutrient by weight.

  • N (Nitrogen) – promotes leafy, green growth
  • P (Phosphorus) – supports root development and flowering
  • K (Potassium) – improves disease resistance and fruit quality
  • The remaining percentage is filler (carrier material)