Landscaping
Fertilizer Calculator
Work out how much fertiliser to apply for a target nitrogen rate, based on the bag's analysis.
Result
Rates are based on nitrogen, the first NPK number. Over-application burns turf and runs off into waterways, and many regions regulate application rates and timing.
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About this calculator
What do the NPK numbers mean?
The percentages by weight of nitrogen, phosphorus and potassium. A 24-0-6 bag is 24% nitrogen, so 4.2 lb of product delivers 1 lb of actual nitrogen.
How much nitrogen does a lawn need?
Typically 1 lb per 1,000 sq ft per application, and two to four applications a year depending on grass type and climate. A soil test beats guessing.
The formula
product per 1,000 sq ft = target nitrogen ÷ (nitrogen % ÷ 100)
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