Lawn seed calculator
Estimate seed for new lawn and separate overseeding areas using the rates on your actual product.
Up to 1 million bags. Rates are editable examples, not recommendations for a seed type, season or site. Zero total area needs no seed. Change the input or settings to update your result. Results update as you type. Up to 1,000,000 characters.
Your result
How to use Lawn seed calculator
- Enter your measured quantities, units and assumptions.
- Review the calculated result and the stated limits.
- Download the report or plan for your project.
Useful next steps
Enter each product rate
Set the new-lawn and overseeding rates with their mass and reference area. A rate of 4 lb per 1,000 square feet stays distinct from grams per square metre.
Buy whole bags
Add an optional allowance, choose the bag weight and see the rounded bag count and leftover seed. Keep new and overseeded areas separate so neither is counted twice.
Save the measurements and assumptions
Download CSV and a text or JSON report. The calculation runs on your device. Changing a unit keeps the number you entered, so check both before using the result.