New Lawn Calculator

The grass seed calculator for new lawn projects applies the full (100%) coverage rate to your lawn area. A new lawn starts from bare soil with no existing turf, so every square foot needs complete seed coverage to establish uniform growth.

To calculate how much grass seed your new lawn needs, use this formula:

This grass seed calculator new lawn tool auto-fills the coverage rate when you select a grass type. The rate represents the manufacturer-recommended application for bare soil. Brands like Scotts, Pennington, and Jonathan Green print these rates on every seed bag.

New lawn seeding rates range from 1 lb per 1,000 ft² for low-density warm-season grasses to 10 lbs per 1,000 ft² for dense cool-season bunch grasses.

These rates apply specifically to new lawn seeding from bare soil. For overseeding or patch repair, use the main grass seed calculator with reduced rate multipliers.

Proper soil preparation is the single most important factor in new lawn success. Seed placed on unprepared soil results in poor germination, uneven growth, and wasted seed.

1. Clear the area. Remove rocks, debris, old vegetation, and any construction materials. Kill existing weeds with a non-selective herbicide or smother them with cardboard 4–6 weeks before seeding.
2. Test your soil pH. Most grass types germinate best in soil with a pH between 6.0 and 7.0. Apply lime to raise pH or sulfur to lower it based on test results.
3. Till the top 2–3 inches (5–7.5 cm). Loosening the soil allows grass roots to penetrate easily and improves seed-to-soil contact.
4. Grade and level the surface. Use a landscaping rake to create a smooth, even surface. Slope the grade away from buildings at 1–2% for drainage.
5. Apply starter fertilizer. Use a phosphorus-rich starter fertilizer (e.g., 10-18-10) at the rate printed on the bag. This promotes root development during germination.
6. Spread seed evenly. Use a broadcast spreader for large areas or a drop spreader for precise edges. Make two passes at half rate in perpendicular directions for uniform coverage.
7. Lightly rake and roll. Rake the seed into the top ¼ inch of soil and roll with a lawn roller to ensure good seed-to-soil contact.
8. Water consistently. Keep the top 1 inch of soil moist (not soaked) until germination. Water 2–3 times daily in short sessions for the first 2–3 weeks.

Use the grass seed calculator for new lawn above to determine exactly how much seed you need before you begin soil preparation. Buying the correct quantity prevents running short mid-project.