Fertilizer Requirement Calculator

Enter your field size and recommended NPK dose to get the quantity of urea, SSP and MOP (in kg and 50-kg bags) to apply.

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What is the Fertilizer Requirement Calculator?

A fertilizer requirement calculator converts the recommended nutrient dose (N, P₂O₅, K₂O per hectare) into actual bags of straight fertilisers.

How to Calculate

Total nutrient = dose × area. Urea = N ÷ 0.46, SSP = P₂O₅ ÷ 0.16, MOP = K₂O ÷ 0.60.

Formula

Fertiliser (kg) = Nutrient needed ÷ Nutrient content

How to Use

  1. Enter your details in the fields above.
  2. The result updates instantly as you type.
  3. Use Copy, Print or Download PDF to save your result.

Frequently Asked Questions

Are these exact?
They are indicative for straight fertilisers. If you use complexes like DAP, adjust for the nitrogen they also supply. Follow your soil-test recommendation.
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