Grass Seed Calculator
(sq ft ÷ 1,000) × bag rate — not a landscaper bid. Click any i for detail.
Lawn
Area (sq ft)
i
Area
Lawn you will seed. Length × width, minus beds. |
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|---|---|
Rate (lb / 1,000 sq ft)
i
Rate
Copy the bag. Overseed is often ~2–4 lb; new lawns are often higher. |
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Bag size (lb)
i
Bag
Weight of the bag you will buy. |
How to use this calculator
- Enter lawn square footage.
- Copy lb per 1,000 sq ft from the seed you chose.
- Enter bag weight.
- Ceil bags at the register.
Results explained
Pounds = (area ÷ 1,000) × rate. Bags = pounds ÷ bag size. Fertilizer nitrogen is a different page.
Quick reference: grass seed
The bag chart wins over a generic rate.
| Item | Detail |
|---|---|
| Overseed sketch | Often ~3 lb / 1,000 |
| New lawn | Often higher — read the bag |
| 5,000 sq ft @ 3 lb | 15 lb |
| Sod instead? | Sod installation cost |
Bare soil vs overseed changes the rate, not the formula.
How the estimate is built
lb = (sq ft / 1000) × rate. bags = lb / bag_size.
Example scenario
5,000 sq ft at 3 lb/1,000 → 15 lb → 0.3 of a 50 lb bag (buy 1).
FAQ
Hydroseed?
Still pounds of seed; slurry is extra.
Shade mix vs sun?
Change the rate to that bag.
Fertilizer with seed?
Use the fertilizer calculator for N.