The three numbers on a bag are the percentages of nitrogen (N), phosphate (P₂O₅) and potash (K₂O) by weight. Lawn and garden recommendations are usually given as pounds of nitrogen per 1,000 sq ft.
Fertilizer to spread: 8.3 lb
Your answer
Fertilizer to spread8.3 lb
Bags1
Rate
4.17 lb per 1,000 sq ft
Phosphate delivered
0 lb
Potash delivered
0.5 lb
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How we worked it out
Updated as you change the numbers.
Area = length × width = 50 ft × 40 ft = 2,000 sq ft.
Product per 1,000 sq ft = 1 lb N ÷ 24% = 4.17 lb.
Method and assumptions
Product needed = target nutrient ÷ the nutrient’s share of the product. A soil test from your extension service tells you how much nitrogen, phosphorus and potassium your soil actually needs; many states restrict phosphorus on lawns.
Questions
How much 24-0-6 to apply 1 lb of nitrogen per 1,000 sq ft?
4.17 lb per 1,000 sq ft: 8.3 lb for a 2,000 sq ft lawn.