The seed you need is set by the seed, not by the lawn alone. The lawn gives an area, but the amount to put on each thousand square feet is printed on the bag, and it differs between products.
Seed weight = lawn area ÷ 1,000 sq ft × label rate
Bags = seed weight ÷ bag weight, rounded up
A 60 × 50 ft lawn
The lawn is 3,000 sq ft. At an example label rate of 4 lb per 1,000 sq ft the seed weight is 12 lb. With 10 lb bags, 12 lb is 1.2 bags, so the list says 2 × 10 lb bags, with 20 lb supplied.
Worked example 60 × 50 ft lawn, 4 lb per 1,000 sq ft (an example label rate), 10 lb bags
| Material | Calculated | Buy |
|---|---|---|
| Grass seed4 lb / 1,000 sq ft label rate | 12 lb | 2 × 10 lb bags |
Why the rate is yours to enter
MeasureList has no built-in seeding rate on purpose. Rates differ by turfgrass, by product and by the job. Penn State Extension’s seed tables, for open, sunny sites in southeastern Pennsylvania, list Kentucky bluegrass alone at 2 to 3 lb per 1,000 sq ft, turf-type perennial ryegrass alone at 4 to 5 lb and turf-type tall fescue alone at 6 to 8 lb. Those are examples of how far apart rates can be, not defaults, and they are specific to the source’s region and mixtures. Use the rate printed on the seed you are buying.
The same lawn at three example label rates, with 10 lb bags:
| Label rate | Seed weight | Bags to buy |
|---|---|---|
| 2 lb per 1,000 sq ft | 6 lb | 1 × 10 lb bag |
| 4 lb per 1,000 sq ft | 12 lb | 2 × 10 lb bags |
| 6 lb per 1,000 sq ft | 18 lb | 2 × 10 lb bags |
The bag size changes the count, not the weight
At 4 lb per 1,000 sq ft the lawn needs 12 lb whatever the bag. The bag only sets how that rounds:
| Bag size | Bags to buy | Supplied weight |
|---|---|---|
| 5 lb | 3 × 5 lb bags | 15 lb |
| 10 lb | 2 × 10 lb bags | 20 lb |
| 25 lb | 1 × 25 lb bag | 25 lb |
This example assumes
- 4, 2 and 6 lb per 1,000 sq ft are example label rates
- No extra allowance: the planner starts at 0% because the label rate is already the amount to apply
What this does not decide
It does not pick a grass type, a rate or a time to seed, and it counts seed only. For turning a label’s printed rate into bags step by step, including metric labels, see how to read a grass seed label rate. Sod is bought by area instead; see how much sod you need.
What changes the estimate?
- The application rate on the label, which varies by product and use
- The bag weight
- Whether you are seeding a new lawn or overseeding, which the label may treat differently
- An allowance if you want a margin