LotSite is a free measuring tool built and operated by RL Calculations LLC, a U.S. company. There is no account, no signup and no charge to use it. The site is supported by advertising and by affiliate links on the product recommendations, which are disclosed on the affiliate disclosure page.
You enter a U.S. address. LotSite centers a Google satellite view on it and lays a measuring grid over the imagery, with cells of 10, 5 or 2 feet. You then paint the cells that cover your lawn, driveway, patio, garden beds, pool or buildings, and the tool adds up the painted cells into square feet for each category. A separate measure mode lets you tap out a shape or a line and reads its area, perimeter or length in feet. From those numbers the site suggests fertilizer, seed, mulch and other quantities, and its calculators turn an area into bags, cubic yards or a cost range.
Everything the tool reports comes from what you traced. The arithmetic on the painted cells is exact for the cells you painted; how closely the painted cells match your yard depends on your tracing and on the imagery, which can be a year or more old and is photographed at an angle.
LotSite does not look up your property lines, your parcel, your deed or your recorded lot size. It does not query any county database and it does not draw legal lines on the map. Nothing on the site is a survey, and no measurement here should be used for a permit, a real estate transaction or a dispute with a neighbor.
Those records exist, and they live elsewhere. Your county GIS portal or assessor site holds the parcel map and the recorded lot size, your deed or plat shows the legal description, and a licensed surveyor is the only person who can locate a line on the ground. Our city pages link to the county portal for 49 metro areas so you can go straight to the official source.
We built LotSite this way on purpose. Parcel data is licensed county by county, varies in quality, and is often months out of date; a tool that overlaid it would have to either pay for it everywhere or show wrong lines somewhere, and a line that looks official but is off by ten feet is worse than no line at all. Tracing what you can actually see, a fence, a driveway edge, the line where grass meets mulch, gives an honest number for the questions people bring here: how much fertilizer to buy, how many pallets of sod, how long a fence run to quote. Those are planning questions, and planning does not need a recorded boundary.
The same rule applies to our copy. We do not describe the tool as instant or precise, because the tracing is done by hand, takes time, and its accuracy is yours to judge. Where a page mentions county records, plat maps or surveyors, it names them as the place to go, never as something LotSite does for you.
Alongside the measuring tool there are 21 calculators for common yard projects, guides on measuring, fertilizing, seeding and reading satellite imagery, and city pages that pair the tool with each area's county records link. The imagery is provided by Google Maps under its terms of service; we do not store or sell it, and we do not store the addresses you enter beyond the current session, as described in the privacy policy.
Questions, corrections and bug reports are welcome on the contact page.