Lawn Measuring Tool: Lawn Size in Square Feet
Measure your lawn size in square feet, then turn it into the quantities the bag actually lists. This lawn measuring tool gives you turf area, and the tables below convert it into grass seed and fertiliser at the standard per-1,000-square-foot rates. Use it as a lawn size calculator before you buy seed, fertiliser or sod.
Lawn Area Calculator
Sod, seed, or hydroseed?
Sod gives instant lawn at the highest cost per square foot. A standard pallet covers 450 sq ft (or 50 sq yd) and arrives ready to install.
Seed is far cheaper per square foot but requires 2–4 weeks to germinate and 2–3 months to establish. One pound of seed typically covers 250 sq ft for new lawns or 500 sq ft for overseeding.
Measuring an irregular yard
Most yards aren’t simple rectangles. Use Google Maps or your phone’s measure tool to get a baseline. For accuracy, break the yard into rectangles and triangles, measure each, and sum the areas.
Subtract obvious non-grass areas: driveways, patios, garden beds, decks, sheds. Don’t worry about removing every tree well — small subtractions average out.
Measuring your lawn correctly
Lawn measurement is harder than it looks because lawns are rarely rectangular. Most yards have driveways, walkways, garden beds, trees, and curved borders that have to be accounted for.
Method 1 — break into rectangles. Walk your yard with a tape measure and divide it into the largest possible rectangular sections. Measure each section and sum the areas. This handles 80% of yards adequately.
Method 2 — pace and pace. Walk the length, count steps (each adult step ≈ 2.5 ft). Walk the width, count steps. Multiply. Works for rough estimates but expect ±15% accuracy.
Method 3 — Google Earth Pro or county GIS measurement tool. Free, accurate to within 5%. Outline your property and lawn area. Many municipal GIS portals offer free lawn measurement features.
Method 4 — drone or aerial measurement service. $50-200 for a professional measurement report. Pays for itself on larger properties where seed, fertilizer, or sod orders are significant.
Seed, fertilizer, and sod by lawn size
Each lawn product has its own coverage rate. Calculate by sq ft and apply the appropriate rate:
Grass seed: 4-8 lbs per 1,000 sq ft for new lawn, 2-4 lbs for overseeding. A 5,000 sq ft lawn needs 20-40 lbs (new) or 10-20 lbs (overseed).
Fertilizer: 1 lb of nitrogen per 1,000 sq ft per application. With typical 24-0-12 fertilizer (24% N), that's 4 lbs of fertilizer per 1,000 sq ft. A 5,000 sq ft lawn: 20 lbs per application.
Weed killer (selective herbicide like 2,4-D): coverage varies by product. Liquid concentrate typically covers 5,000-15,000 sq ft per gallon when diluted.
Lime: 40-50 lbs per 1,000 sq ft if soil test indicates low pH. A 5,000 sq ft lawn: 200-250 lbs.
Top-dressing compost: 1/4 inch of compost over the lawn = 0.77 cubic yards per 1,000 sq ft. A 5,000 sq ft lawn: 3.85 cu yd. At $30-50 per cu yd: $115-200 in compost.
Seed and fertiliser quantities by lawn size
Lawn products are all rated per 1,000 square feet, which is why measuring the turf area is the first step of every lawn job. Once you have the number, seed and fertiliser quantities are straight multiplication — and both are expensive to get wrong in opposite directions.
Seeding rates depend on whether you are starting bare ground or thickening what is already there. Tall fescue, the most common cool-season choice, goes down at about 7 lb per 1,000 sq ft on a new lawn and roughly half that for overseeding. Kentucky bluegrass is finer seed and needs only 2-3 lb per 1,000 sq ft new.
Fertiliser is rated by nitrogen, not by bag weight. The standard application is 1 lb of actual nitrogen per 1,000 sq ft. A 29-0-4 bag is 29% nitrogen, so you need 1 ÷ 0.29 = 3.45 lb of product to deliver that pound. Read the first number on the bag and do this division every time; it changes with every product.
Worked example — a 5,000 sq ft lawn. New tall fescue seed at 7 lb per 1,000 is 35 lb. Overseeding the same lawn takes about 17.5 lb. One fertiliser application with a 29-0-4 product takes 5 × 3.45 = 17.3 lb, so a 20 lb bag covers it with a little left over.
Measure the turf, not the lot. Driveways, beds, the house footprint and the patio all come out before you buy. Over-seeding a lawn because you measured the whole property wastes money; over-fertilising it burns the grass, which costs a season.
| Lawn area | New seed (fescue, 7 lb/1k) | Overseed (3.5 lb/1k) | Fertiliser, 29-0-4 (3.45 lb/1k) |
|---|---|---|---|
| 1,000 sq ft | 7 lb | 3.5 lb | 3.5 lb |
| 2,500 sq ft | 17.5 lb | 8.8 lb | 8.6 lb |
| 5,000 sq ft | 35 lb | 17.5 lb | 17.3 lb |
| 7,500 sq ft | 52.5 lb | 26.3 lb | 25.9 lb |
| 10,000 sq ft | 70 lb | 35 lb | 34.5 lb |
| 15,000 sq ft | 105 lb | 52.5 lb | 51.8 lb |
Cost per square foot for common lawn projects
Lawn care and improvement projects, priced per square foot of lawn:
Lawn mowing service: $0.01-0.04 per sq ft (so $30-120 per service for a 5,000 sq ft lawn).
Fertilization program (4-5 visits/year): $0.10-0.25 per sq ft per year = $500-1,250 annually for a 5,000 sq ft lawn.
Lawn aeration: $0.10-0.30 per sq ft once a year.
Sod installation (replace existing lawn): $1-3 per sq ft installed. A 5,000 sq ft lawn: $5,000-15,000.
Seeding new lawn: $0.10-0.40 per sq ft for seed + prep work. Sod is 3-10× more expensive but provides instant lawn.
Irrigation system: $1-3 per sq ft installed. A 5,000 sq ft lawn: $5,000-15,000 for in-ground irrigation.
Pro tips
Order by the pallet
Sod is sold by the pallet (450 sq ft typical). Don’t round up too aggressively — sod has a 24–48 hour install window before it dies.
Time your seeding
Cool-season grasses go down in early fall or spring. Warm-season grasses prefer late spring through early summer.
Use a fertilizer app rate
Fertilizer bags rate coverage by sq ft. A 10,000 sq ft bag of starter fertilizer covers most quarter-acre lawns once.
Subtract hardscape
Patios, driveways, walkways, and beds shouldn’t be in your sod calculation.