Grass Seed Calculator

Calculate the amount of grass seed needed for a new lawn or overseeding an existing lawn. Adjust for grass type and seeding rate.

Enter Your Measurements

Lawn Length(ft)

Lawn Width(ft)

Seeding Rate(lbs/1000 sq ft)

New lawn: 6-8 lbs. Overseeding: 3-4 lbs per 1000 sq ft

Results

Seed Needed

12.0

lbs

25 lb Bags

bags

5 lb Bags

bags

Lawn Area

1,500

sq ft

Formula

Seed (lbs) = (Area sq ft ÷ 1000) × Seeding Rate

How to Use This Calculator

How to Use

1
Enter your lawn dimensions.
2
Set the seeding rate based on project type.
3
New lawns need 6-8 lbs per 1000 sq ft.
4
Overseeding needs 3-4 lbs per 1000 sq ft.

Frequently Asked Questions

When is the best time to plant grass seed?

Fall (September-October) is ideal for cool-season grasses. Late spring (May-June) is best for warm-season grasses.

How much grass seed per 1000 square feet?

For new lawns, use 6-8 pounds per 1000 sq ft. For overseeding, use 3-4 pounds per 1000 sq ft.

In-Depth Guides

📖

How Much Sod Do You Need? Pallets, Rolls & Coverage Guide

Calculate sod for lawns, calculate by square footage, pallets, and rolls. Includes installation tips, watering schedule, and cost per pallet.

Related Calculators

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About This Calculator

This calculator uses the formula: Seed (lbs) = (Area sq ft ÷ 1000) × Seeding Rate. All calculations follow industry-standard methods. Results are estimates — always verify with a licensed professional for structural or code-compliant work.

Built and maintained by the CalcSmart team. Last updated March 2026.

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