DIY Calculator

Fertilizer Calculator

Estimate fertilizer needed based on lawn square footage and a standard nitrogen rate.

Reading fertilizer numbers

  • N — Nitrogen

    Drives green, leafy growth. Most maintenance programs target about 1 lb of actual nitrogen per 1,000 sq ft per application.

  • P — Phosphorus

    Supports root development and early establishment. Often lower in routine lawn fertilizers once the lawn is mature.

  • K — Potassium

    Helps overall plant health, stress tolerance, and disease resistance. The trailing number in a label like 32-0-4.

  • Follow the label

    This calculator uses a 32-0-4 example. Your product may differ — always defer to the bag rate over general estimates.

FAQ

How much nitrogen does a lawn need?
A common homeowner target is about 1 lb of actual nitrogen per 1,000 sq ft per application. Always follow your product label — rates vary.
What does 32-0-4 mean?
It means 32% nitrogen by weight. To deliver 1 lb of nitrogen you need about 3.1 lb of product.