Lawn fertilizer calculator
The three numbers on the bag (N-P-K)
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Lawn size
Spread per 1,000 sq ft
4.17 lb
20.8 lb for the whole lawn (5,000 sq ft).
- Bags to buy
- 1 (you use 42% of it)
- Nitrogen applied
- 5 lb
- Phosphate (P₂O₅) applied
- 0 lb
- Potash (K₂O) applied
- 2.08 lb
Check the label: its rate and spreader setting come first. Split the total across two passes at right angles for even cover.