How to Measure a Lawn From Satellite Imagery (Step by Step)
How to measure a lawn from satellite imagery: Google Earth steps, dedicated tools, accuracy limits, subtracting hardscape, and when to visit the site.
By the AboveYard team · Updated October 16, 2026 · 8 min read
Every price on a lawn rate sheet starts with a number: how many square feet of turf. Get that wrong and the per-1,000 math is wrong on every line. Satellite measurement lets you get it right before you drive out, and for most residential work it is the only measurement you need. Here is how we do it, where it fails, and when a site visit still pays for itself.
Why measure before quoting
Three reasons. A measured quote is defensible: if the customer says "the neighbor pays less," you can show them you are pricing 9,200 sq ft, not guessing. You can quote the same day the lead comes in. And you stop subsidizing big lawns with small-lawn pricing, which is what happens when everything is "about fifty bucks."
The extension services have taught the manual version of this for decades: sketch the lawn, break it into rectangles and triangles, measure each, add them up. Iowa State's guidance is to compute rectangles as length × width, triangles as base × height × 0.5, and irregular shapes by breaking them into pieces and summing, per Iowa State University Extension. Satellite tools do the same arithmetic, with the sketch drawn on an aerial photo instead of a notepad.
Method 1: Google Earth (manual, free)
Google Earth on a computer has a measurement tool that handles polygons. The steps, from Google's own help page:
- Open Google Earth and search for the address.
- Click the Measure tool; the view switches to top-down.
- Click the map to set points around the area.
- To measure an area, connect back to your first point to close the shape.
- The area appears on the right, and you can click the unit dropdown to change it, per Google Earth Help.
Set the unit to square feet. For acres, divide by 43,560.
Tips that make the manual method usable for pricing:
- Zoom in until the turf edge is sharp. Place points every 10 to 20 feet along curved edges; straight edges need only the corners.
- Trace the turf, not the lot. Follow the grass edge around beds, the driveway and the house footprint. It is slower than tracing the lot, but you avoid a second step of subtracting.
- Where beds sit inside the lawn (island beds, tree rings), trace them separately and subtract.
- Save the measurement with the customer's name so you can reuse it for fertilization and aeration quotes.
The mobile app measures area the same way (tap Measure, add points, close the shape), per Google Earth Help, but tracing a detailed polygon on a phone is tedious.
Google Earth also lets you look back through earlier imagery with a time slider; the lines on the timeline mark the dates for which images are available, per Google Earth Help. Use it to confirm whether the current image predates a new patio or pool.
Method 2: Dedicated lawn measurement tools
Several tools wrap the same satellite imagery in a lawn-specific workflow. They are faster than Google Earth for a crew that measures dozens of properties a week.
| Tool | What it does | Cost |
|---|---|---|
| Measure My Lawn | Free web app; enter an address or open the map and draw on Google satellite imagery; guides for lawn care, paving and snow operators | Free, donation supported, per measuremylawn.com |
| AboveYard Lawn Size Calculator | Free; enter an address, trace turf and subtract hardscape; feeds a rate sheet if you use the paid quoting tool | Free |
| Deep Lawn | AI measurement of lawn, buildings, driveways, walkways and tree cover, with instant online quoting and a website widget, per deeplawn.com | Plans from $120 per month with 40 searches included, per Deep Lawn pricing |
| Google Earth | Manual polygon tool, no lawn-specific features | Free |
Automated measurement (where software detects the turf for you) is the fastest and the most expensive. It is a good fit for companies running website quoting at volume. For an owner-operator, a free manual-trace tool plus a rate sheet gets you the same square footage in a couple of minutes per property.
Whichever tool you choose, check its output on five properties you already know by walking them with a measuring wheel. If the tool is consistently within a few percent on open lawns, trust it for those; if it drifts on treed lots, that is your signal to visit those.
Subtracting the house, driveway and beds
If you traced the lot instead of the turf, you need to remove everything that is not grass. Iowa State's method applies: compute each non-lawn shape and subtract it, breaking irregular shapes into rectangles and triangles, per Iowa State University Extension.
Work through this checklist on the satellite view:
- House and garage footprint, including attached porches and decks.
- Driveway, parking pads, walkways and patios.
- Planting beds, including mulched tree rings and foundation beds.
- Pool, pool deck, sheds, play structures, fenced dog runs.
- Gravel, bare dirt and natural areas that you will not mow.
A property that looks like a quarter acre on the tax record often has 6,000 to 7,000 sq ft of mowable turf once all that comes out. That difference is the whole margin on a mowing route.
Keep the non-turf shapes, though. Bed area drives your mulch quote (convert with our mulch calculator), and bed perimeter drives edging.
Accuracy limits you need to know
Satellite measurement is good enough to price with, as long as you know where it breaks.
Tree canopy
The camera sees the tops of trees, not the grass beneath. A lawn under mature oaks can be badly under- or over-measured depending on how you treat the canopy. Our rule: trace the lawn edge where you can see it, assume turf continues under canopy that sits inside the lawn, and exclude canopy at the property edge where there is probably a wooded buffer. Flag the property for a visit if canopy covers more than roughly a third of what you think is lawn.
Imagery date
The image may be older than the landscape. New construction, a recently added pool or patio, or a bed expansion will not show up. Use the Google Earth time slider to check available dates, per Google Earth Help, and ask the customer on the phone whether anything has changed in the yard in the last couple of years.
Slopes
Satellite area is the flat, map-view area. A sloped lawn has more real surface than its map footprint, and it takes longer to mow than its footprint suggests. The geometry is simple: true surface area = map area ÷ cos(slope angle). On a gentle grade the difference is small; on a steep bank the push-mowing time penalty matters more than the extra area. Price slopes as a surcharge, not as extra square feet.
Edge placement
Every point you place is a judgment about where the grass stops, and on a small lawn a few feet of error around the whole perimeter is a meaningful percentage. Zoom in and place more points on curves.
Converting square feet to acres
Divide square feet by 43,560. Useful anchors:
| Square feet | Acres |
|---|---|
| 5,445 | 1/8 |
| 10,890 | 1/4 |
| 21,780 | 1/2 |
| 32,670 | 3/4 |
| 43,560 | 1 |
Keep your rate sheet in square feet or per 1,000 sq ft, and convert to acres only when the customer asks. Acre fractions hide the difference between a 9,000 and a 12,000 sq ft lawn, and that difference is a different price.
When to still visit the site
We measure everything from satellite first, and still visit when any of these are true:
- Heavy tree cover over the turf.
- The imagery looks older than the house, or the customer mentions recent work.
- Steep grades, retaining walls or terraced lawns.
- Gates, fences or hedges that hide part of the yard from above.
- Access questions: can a 60-inch deck get through the gate?
- The job is large enough that a 10 percent measurement error costs more than the drive.
- Cleanups and installs, where condition matters more than area.
For a weekly mowing lead on an open suburban lot, the satellite number is the quote. For a one-acre fall cleanup under a hardwood canopy, the satellite number is a starting estimate, and you confirm it on site.
A simple workflow
- Lead comes in with an address.
- Measure turf and beds from satellite (two to five minutes).
- Price from your rate sheet per 1,000 sq ft.
- Send the quote the same day with the measured area shown on it.
- Visit only the properties that trip one of the flags above.
That workflow is what AboveYard is built around: measure from satellite, price from your rate sheet, send a quote the customer can approve online. If you only want the measurement, the Lawn Size Calculator is free and does not require an account, and the other tools above are good options too. The important thing is that you stop quoting from a drive-by.
Sources
Frequently asked questions
- Can I measure a lawn with Google Earth?
- Yes. Open Google Earth, search the address, click the Measure tool, click points around the turf, and connect back to your first point to close the shape. The area appears in the panel, and you can switch the unit to square feet or acres.
- How accurate is satellite lawn measurement?
- For open turf with a clear edge, a carefully traced polygon is close enough to price mowing and applications. Accuracy drops under tree canopy, on steep slopes, and wherever the imagery is older than the landscape.
- How do I subtract the house, driveway and beds from a lawn measurement?
- Trace the whole lot, then trace each non-turf area (house, driveway, walks, beds, pool) and subtract them. Most dedicated tools let you draw the turf polygon directly around the grass instead, which is faster.
- How do I convert lawn square feet to acres?
- Divide square feet by 43,560. A 10,890 sq ft lawn is a quarter acre; 21,780 sq ft is half an acre; 43,560 sq ft is one acre.
- When should I still visit the property before quoting?
- Visit when the satellite view shows heavy tree cover, new construction, steep grades, gated or fenced areas you cannot see, or when the job is large enough that a 10 percent error would cost you real money.