Lawn Area Calculator
Calculate the true square footage of your lawn or turf grass. Measure rectangular, circular, or triangular lot shapes, and subtract house foundations, driveways, decks, and swimming pools to determine your exact net grass area.
Primary geometric shape of the property
Length for rectangle, diameter for circle, base for triangle
Width for rectangle, height for triangle (ignored for circle)
Non-grass areas: house footprint, driveway, patio, swimming pool, and landscape beds
Actual turfgrass area needing seed, fertilizer, and irrigation
How to Use This Calculator
- Choose the primary shape of your yard.
- Pace or tape measure the primary lot boundaries in feet.
- Estimate non-grass deductions (house footprint, driveway, patio).
- Use the net turf square footage to purchase seed, fertilizer, and sod.
Formula & Calculation Methodology
Total yard footprint is calculated from boundary measurements and adjusted by subtracting non-grass impervious hardscapes (such as driveways, buildings, and garden borders).
Worked Example
Suburban lot: 100 ft × 60 ft rectangle with 1,500 sq ft house/driveway deduction
Circular backyard lawn: 50 ft diameter, 0 deductions
Frequently Asked Questions
How many square feet are in a typical residential lawn?↓
The average suburban US residential lawn ranges from 5,000 to 10,000 square feet (roughly 1/8 to 1/4 acre of turf). Urban lawns are often 1,500–3,000 sq ft.
How do I measure an irregularly shaped yard?↓
Divide your yard into smaller, manageable geometric shapes (two or three rectangles and a triangle), calculate each area separately, and sum them together.
Why is knowing exact lawn square footage so important?↓
Nearly all lawn care inputs (fertilizer, grass seed, pre-emergent herbicide, grub control, and irrigation) are formulated and priced per 1,000 square feet. Guessing leads to chemical burn or under-application.
What is a limitation of planar lawn area calculations?↓
Steep hills, slopes, or rolling swales have slightly more surface turf area than flat horizontal aerial property line dimensions suggest (typically 3% to 8% more).