Lawn Square Footage Calculator
Seed, sod, and fertilizer are all sold by the square foot — so measure first. Break your lawn into up to 3 rectangles plus one circle, and get the total area in square feet and acres.
Leave sections you do not need at 0. Overlap sections slightly on your sketch rather than leaving gaps — a little extra seed is cheaper than a bare patch.
How the lawn square footage calculator works
Few lawns are perfect rectangles, so the trick is to split the lawn into simple shapes on paper: rectangles for the main stretches, a circle for a round bed or tree ring. Each rectangle contributes length × width, the circle contributes πr², and the total converts to acres at 43,560 sq ft per acre.
Use the total when buying seed (bags list their coverage), sod (sold by the square foot or pallet), or fertilizer (bags list coverage per 1,000 sq ft). Add 5–10% extra for waste and overlap.
sq ft = Σ L×W + π(d/2)² · acres = sq ft ÷ 43,560
Related tools
Keep exploring: Lawn Mowing Cost Calculator · Sod Calculator · Mulch Calculator.
Lawn square footage calculator FAQ
How do I measure an irregularly shaped lawn?
Sketch it and divide it into rectangles and circles that roughly cover the shape, measure each, and add them up. Small overlaps are fine — gaps underestimate what you need to buy.
How many square feet are in an acre?
43,560. A quarter-acre lot is 10,890 sq ft — though the lawn itself is smaller once you subtract the house, driveway, and beds.
How much seed do I need for my lawn?
Seed bags state coverage — often 5,000 sq ft per bag for overseeding or 2,500 for new lawns. Divide your total square feet by the bag coverage and round up.
How is sod sold?
By the square foot, roll, or pallet (a pallet often covers 400–500 sq ft). Measure first, then add 5–10% for cutting waste around edges.
Should I subtract the house and driveway?
Yes — measure only grass areas. If a rectangle covers the house footprint, split around it or subtract that rectangle’s area with a second entry.