Grass Seed Calculator
Calculate the amount of grass seed needed for your lawn based on area and seeding rate.
Published by:
isCalculator Editorial Team
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How to use this tool?
How to use the Grass Seed Calculator:
- Enter Lawn Area (in square feet): Type the total area of your lawn in the first field (e.g., 5000).
- Enter Seeding Rate (in pounds per 1000 sq ft): Type the recommended seed rate for your grass type (e.g., 5).
- Click "Calculate": The button will validate your inputs. If either field is empty or zero, a red error will appear.
- Read the result: The required seed amount in pounds (lbs) will appear in the green box. The formula used is shown below for reference.
Note: All inputs must be positive numbers. The calculator uses imperial units (square feet and pounds). For metric areas, convert to square feet first (1 m² ≈ 10.764 sq ft).
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Frequently Asked Questions
Measure the length and width of your lawn in feet, then multiply them to get the area in square feet. For irregular shapes, break the area into rectangles and sum them up.
Seeding rates vary by grass type. For example, Kentucky bluegrass is about 2-3 lbs per 1000 sq ft, while tall fescue is 6-8 lbs per 1000 sq ft. Check your seed package.
It's a good idea to buy 5-10% more than calculated to account for uneven spreading and bare spots.