Whether you need your lot size for a fence, landscaping project, or insurance, here is every method for measuring your property — from low-tech to instant.
Knowing your exact property dimensions matters more than most homeowners think. From buying the right amount of fertilizer to planning a fence or resolving a boundary dispute, accurate measurements save time and money. Here are the four most common approaches, ranked from most effort to least.
The most hands-on method is to walk your property with a 100-foot tape measure and mark each corner with stakes. Measure the length of each boundary line, then calculate the total area. For rectangular lots, multiply length by width. Irregular shapes require breaking the lot into triangles and rectangles.
Pros: No cost beyond the tape measure. Gives you ground-level familiarity with your lot.
Cons: Time-consuming, inaccurate on hilly terrain, and difficult for large or irregular lots. You also need to know where your corners are in the first place.
Several smartphone apps use your phone's GPS to record waypoints as you walk the perimeter. The app then calculates the enclosed area. Consumer GPS is accurate to roughly 10–15 feet, which can introduce significant error on smaller residential lots.
Pros: Faster than a tape measure. Good for rough estimates on large rural parcels.
Cons: GPS drift means your result can be off by hundreds of square feet on a typical suburban lot. Tree cover and buildings make accuracy worse.
Every county assessor maintains parcel records that include your lot's legal description and dimensions. Many counties offer online GIS portals where you can search by address or parcel number. The data comes from recorded plat maps and deeds.
Pros: Official data source. Free in most counties.
Cons: GIS portals are notoriously hard to navigate. Data is often displayed as bare numbers without a visual overlay, making it difficult to understand in context. You usually cannot measure sub-areas like your lawn versus your driveway.
Tools like LotSite pull the same county assessor parcel data and overlay it on satellite imagery. You type your address, see your boundary on the map, and get your total lot size in seconds. Better yet, you can paint individual areas — lawn, driveway, patio, pool — to get a square footage breakdown for each.
Pros: Instant results. Visual boundary on satellite imagery. Can measure sub-areas. Free.
Cons: Not suitable for legal boundary disputes (use a licensed surveyor for that).
Enter your address below to see your property boundary on satellite imagery and get your lot size instantly — free.
The right method depends on why you need the measurement and how precise it needs to be.
Buying fertilizer, seed, mulch, or sod? You need square footage for your lawn — not your entire lot. Use LotSite to paint just the grass area and get the exact number to plug into a fertilizer calculator or seed calculator.
You need the perimeter (linear feet), not the area. LotSite's fence tool lets you trace your planned fence line on the satellite map and get the total linear footage. Then plug it into the fence calculator for material and cost estimates.
For listing a home, getting insurance quotes, or verifying tax assessments, total lot size matters. County records are the official source, but LotSite gives you a quick visual confirmation with the same parcel data.
If there is a legal dispute, a new construction project, or you need stakes in the ground, hire a licensed surveyor. No online tool or DIY measurement replaces a professional survey for legal purposes. Expect to pay $300–$800.
Your deed description is the legal source of truth for property boundaries. Check it against any measurements you take.
Lot size on your tax bill may not match the actual usable area — it often includes easements, rights of way, and setbacks.
Satellite imagery is updated periodically. If you recently built a structure, it may not appear yet. The boundary data is still accurate.
For irregular lots, break the area into simple shapes (rectangles and triangles), measure each, and add them up.
When buying landscaping materials, round up by 5–10% to account for waste and irregular edges.
Skip the tape measure. Enter your address and see your lot boundaries in seconds.