By lawn size
How much fertilizer for half an acre?
Half an acre is 21,780 sq ft, about 148 ft on each side of a square. At the usual 1 lb of nitrogen per 1,000 sq ft, that is 21.8 lb of nitrogen, or 75.1 lb of a 29-0-4 lawn food.
The short answer
- Lawn food 29-0-475.1 lbat 1 lb N per 1,000 sq ft
- Complete 16-4-8136 lbat 1 lb N per 1,000 sq ft
- All-purpose 10-10-10218 lbat 1 lb N per 1,000 sq ft
- Urea 46-0-047.3 lbat 1 lb N per 1,000 sq ft
Pounds to spread
Fertilizer for half an acre, by rate
One feeding usually carries 0.5 to 1 lb of nitrogen per 1,000 sq ft. Pick the row for your bag's first number.
| Bag numbers | 0.5 lb N / 1,000 | 0.75 lb N / 1,000 | 1.0 lb N / 1,000 |
|---|---|---|---|
| 29-0-4 lawn food | 37.6 lb | 56.3 lb | 75.1 lb |
| 16-4-8 complete | 68.1 lb | 102 lb | 136 lb |
| 10-10-10 all-purpose | 109 lb | 163 lb | 218 lb |
| 46-0-0 urea | 23.7 lb | 35.5 lb | 47.3 lb |
Bags to buy
Whole bags at 1 lb of nitrogen
| Bag numbers | 15 lb bags | 30 lb bags | 50 lb bags |
|---|---|---|---|
| 29-0-4 | 6 | 3 | 2 |
| 16-4-8 | 10 | 5 | 3 |
| 10-10-10 | 15 | 8 | 5 |
| 46-0-0 | 4 | 2 | 1 |
A whole year
Nitrogen a year for half an acre, by grass
Typical yearly ranges from university extension guides, multiplied out for half an acre. Spread the total over several feedings.
| Grass | lb of nitrogen a year | lb of 29-0-4 a year |
|---|---|---|
| Kentucky bluegrass | 21.8–87.1 | 75.1–300 |
| Tall fescue | 21.8–87.1 | 75.1–300 |
| Bermudagrass | 65.3–109 | 225–376 |
| St. Augustinegrass | 43.6–87.1 | 150–300 |
| Zoysiagrass | 43.6–65.3 | 150–225 |
| Centipedegrass | 8.7–43.6 | 30.0–150 |
Calculator
Your bag, your rate
The calculator starts at half an acre. Type the numbers from your own bag for an exact answer.
Other sizes
Fertilizer by lawn size
Questions
Half an acre, answered
How much fertilizer do I need for half an acre?
At the usual 1 lb of nitrogen per 1,000 sq ft, half an acre takes 21.8 lb of nitrogen. That is 75.1 lb of a 29-0-4 lawn food, 136 lb of 16-4-8 or 218 lb of 10-10-10.
How many bags of fertilizer for half an acre?
With 29-0-4 at 1 lb of nitrogen per 1,000 sq ft, you need 75.1 lb: 6 bags of 15 lb or 2 of 50 lb. Bags round up, so check what is left over in the calculator above.
How big is half an acre?
Half an acre is 21,780 sq ft, about 148 ft on each side of a square. Measure your own lawn with the lawn measuring tool, leaving out the house, drive and beds.