Grass Seed Calculator - Free, Instant, In Your Browser
Enter the lawn area in square feet and the seeding rate from your seed bag (lb per 1000 sq ft) to calculate how much seed to buy.
How to use Grass Seed Calculator
- 1Enter the required date(s) and details above.
- 2Click Calculate - Grass Seed Calculator runs instantly, right in your browser.
- 3Read your result below.
Your file is processed in your browser and is never uploaded.
Frequently Asked Questions
What's the formula?
Seed needed (lb) = area × (rate per 1000 sq ft / 1000). The rate varies by grass type, so check your specific seed bag.
Is my data sent to a server?
No - everything runs entirely in your browser with JavaScript. Nothing is uploaded.