Lawn Square Footage Calculator
Calculate your lawn area in square feet, square yards, and acres. Supports rectangular, circular, triangular, and L-shaped lawns. Use the result for seeding, fertilizing, and weed control.
Lawn Shape
Choose the shape that best matches your lawn. For irregular yards, break the area into sections and add them up — or use L-Shape for a two-section lawn.
Lawn Dimensions
Measure the full length and width of the rectangular area.
Length
Width
Lawn Area
1,500 sq ft
166.7 sq yd · 0.0344 acres
Use this area for lawn care calculations
Your lawn area in square feet is the key input for calculating seed, fertilizer, and weed control amounts. Most product labels give coverage rates per 1,000 sq ft.
Area calculated as length × width.
💡About this calculator▼
Every bag of grass seed, fertilizer, and lawn treatment is sized for a specific square footage. Before you buy anything, you need to know how much lawn you actually have.
This calculator covers the four most common lawn shapes: rectangle, circle, triangle, and L-shape. Enter your dimensions and get your square footage instantly — along with square yards and acres for products that use different units.
The calculator applies standard geometric area formulas to your lawn dimensions, then converts the result to square yards (÷ 9) and acres (÷ 43,560). For L-shaped lawns, the area is the sum of two separate rectangles. All measurements are in feet.
📐How it's calculated▼
Rectangle: Area (sq ft) = Length × Width
Circle: Area (sq ft) = π × (Diameter ÷ 2)²
Triangle: Area (sq ft) = Base × Height ÷ 2
Note: Height is the perpendicular distance from the base to the opposite corner — not the length of the slanted side.
L-Shape: Area (sq ft) = (Section A Length × Section A Width) + (Section B Length × Section B Width)
Divide your L-shaped lawn into two non-overlapping rectangles, measure each one, and enter both sets of dimensions.
Unit conversions: Square yards = Square feet ÷ 9 Acres = Square feet ÷ 43,560
📎Source: Standard geometric area formulas; USDA lawn care and turfgrass management guidelines
🔍Finding your inputs▼
Lawn Shape: Choose the shape that best matches your lawn. For an irregular yard, break it into sections that match one of the four shapes and measure each one. For a two-section yard, use the L-Shape option. For more than two sections, calculate each one separately and add the results.
Length / Width (Rectangle): Measure the full length and width from edge to edge. Do not subtract the area of the house, driveway, or garden beds — do that manually if needed.
Diameter (Circle): Measure across the widest point of the circular area.
Base / Height (Triangle): The base is one edge of the triangle. The height is the perpendicular distance from that edge to the opposite corner — not the slant length of the other sides. For a right triangle, base and height are the two sides that meet at the right angle.
Section A / Section B (L-Shape): Mentally divide your L-shaped lawn into two rectangles by drawing an imaginary line across the notch. Measure Section A (the larger piece) and Section B (the smaller piece) separately. Make sure the sections don't overlap.
⚠️Special situations▼
Lawn has curved or irregular edges
Measure to the straightest lines you can and use the closest shape. A slight overestimate is better than an underestimate for seeding and fertilizing — you'll want full coverage. For highly irregular lawns, break the area into multiple simple shapes, calculate each separately, and add the results.
Should I subtract the house, driveway, and garden beds?
Yes, if you want a precise figure for chemical or seed quantities. Measure the house footprint and any large non-lawn areas as rectangles and subtract them from the total. For most homeowners, a rough estimate that includes these areas by 10–15% is close enough and ensures full product coverage.
My lawn is roughly triangular but the sides are curved
Use the triangle formula and estimate the base and height conservatively. The result will slightly underestimate the actual area. Alternatively, break the area into a rectangle plus a triangle for a more accurate total.
L-shaped lawn with more than two distinct sections
The calculator handles a two-section L-shape. For lawns with three or more sections, calculate each rectangular section separately, then add the results together. A typical three-section yard takes about 60 seconds to measure and calculate in three steps.
❓Common questions▼
How do I measure my lawn without a tape measure?
Walk the perimeter and count your steps. One average adult step is about 2.5 feet. For a 50-foot length, you'd count approximately 20 steps. For more precision, use a measuring wheel (available at hardware stores) or a GPS-based lawn measurement app on your phone. Google Maps satellite view can also give you rough dimensions by right-clicking two points and selecting "Measure distance."
How many square feet is a typical residential lawn?
The average American residential lawn is roughly 10,000 square feet (about a quarter acre), but this varies widely. Smaller suburban lots might have 2,000–4,000 sq ft of lawn. Larger suburban properties can have 8,000–15,000 sq ft. Rural properties can exceed an acre or more of managed lawn.
Why do some products use square yards instead of square feet?
Older fertilizer and lawn products — particularly those sold in the UK and by traditional brands — use square yards as the base unit. One square yard is 9 square feet. Sod is also typically sold and priced per square yard. If a product says "covers 500 sq yd," multiply by 9 to get square feet (4,500 sq ft) for comparison.
How do I calculate lawn area from a property survey or plat map?
Property surveys show lot dimensions in feet. Subtract the approximate footprint of your house (length × width), driveway, and any large paved or landscaped areas to estimate lawn area. Most plat maps are available from your county assessor's office or on property search websites.
What is the right amount of grass seed for my lawn area?
Seeding rates depend on the grass type and whether you are overseeding or starting from bare soil. As a general guide: Kentucky bluegrass needs 2–3 lbs per 1,000 sq ft for new seeding; tall fescue needs 6–8 lbs; bermudagrass needs 1–2 lbs. Check your specific seed bag for the recommended rate, then multiply by your lawn area in thousands of square feet.
➜ What to Calculate Next
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