5000 ft2 at 6 lb / 1,000 ft2
- Bags to buy
- 2
- Adjusted lawn area
- 5250 ft2
- Estimated cost
- $130.00
New lawns, overseeding, grass species, soil temperature, slopes, shade, and seed label rates all affect the right seed amount.
Grass Seed Calculator
Use this free grass seed calculator to estimate seed pounds, bags to buy, and optional cost from lawn area, seed label rate, waste percent, and bag weight.
Research-backed assumptions Formula steps Examples included Private in-browser use
Formula steps
- Add waste to the measured lawn area.
- Multiply adjusted area by the seed rate per 1,000 square feet.
- Divide by bag weight and round up to whole bags.
How to use the grass seed calculator
- Enter lawn area, seed label rate, waste percent, bag weight, and optional bag price.
- Press Estimate seed to see seed pounds, bags to buy, and optional cost.
- Use the label rate for new lawn or overseeding because those rates are usually different.
- Grass type, shade, soil prep, slope, spreader setting, and weather can change the result.
Common uses
Estimate seed for a new lawn.
Estimate seed for overseeding.
Convert seed label rates into pounds and bags.
Add optional bag price for material cost.
Examples
31.5 lb
Seed pounds and bags
1 bag
Frequently asked questions
Plain-language answers about when to use the tool, what it does with your inputs, what to double-check, and how privacy works.
When should I use the Grass Seed Calculator?
Use it when your task matches one of these common needs: Estimate seed for a new lawn. Estimate seed for overseeding. It works best when you already know the values, dates, units, or settings the page asks for.
What is the Grass Seed Calculator doing with my inputs?
In plain language: The calculator adds waste to lawn area, multiplies by the seed rate per 1,000 square feet, then divides by bag weight and rounds up to whole bags. The examples on the page are there so you can compare your inputs with a filled-out calculation before copying the answer.
What do the main Grass Seed Calculator inputs mean?
Seed rate: the pounds of seed recommended per 1,000 square feet on the seed label. Lawn area: the measured area you want to seed or overseed. Bag weight: how many pounds one seed bag contains. Waste percent: extra seed for overlap, missed strips, bare spots, and uneven spreading.
How should I read the Grass Seed Calculator answer?
Read the headline estimate first, then check the material, waste, coverage, and unit lines. For project tools, the supporting lines are often the difference between a rough idea and a list you can actually shop from.
What should I double-check before trusting the answer?
Seed needs depend on grass type, new lawn versus overseeding, soil prep, shade, slope, spreader setting, climate, and seed label instructions. Also check that you used the right unit, date, scale, or mode because small input changes can change the result.
Why are new lawn and overseeding rates different?
A new lawn needs seed over bare soil, so the rate is usually higher. Overseeding fills in an existing lawn, so the label rate is often lower. Use the rate that matches your job.
Should I round up grass seed bags?
Yes. Seed is sold by bag size, and small bare spots often need a little extra. The calculator rounds bags up so you do not plan to buy part of a bag.
Does the site save what I enter?
No. The calculator runs in your browser tab. Your recent answers stay only on the page while you use it, and they are not sent to a server.