Satellite Area Calculator for Roofing
Measure any roof from satellite imagery in minutes — square footage, roofing squares, and per-plane breakdowns — before you send a crew or climb a ladder. Free, no account needed.
Why roofers measure from satellite first
- Quote faster. Get a footprint number while the homeowner is still on the phone, instead of scheduling a site visit for every lead.
- Estimate materials. Convert footprint to surface area with a pitch factor, then to squares — enough to ballpark shingles, underlayment, and drip edge.
- Screen jobs. Spot complex hip-and-valley roofs, steep pitches, and tree cover from the imagery before you price the labor.
- Document the bid. Save the traced roof and share a link with the customer or your crew.
How to measure a roof in three steps
- Find the property. Search the address, or ask the built-in assistant — the blue chat bubble on the map — to take you there. Zoom all the way in.
- Trace each roof plane. Click the corners of each plane rather than the whole outline. Per-plane numbers make the pitch correction and waste factor honest.
- Convert to squares. Multiply each plane's footprint by its pitch factor, add them up, and divide square feet by 100. Add your usual waste percentage on top.
Frequently asked questions
How accurate is a satellite roof measurement?
On current imagery at full zoom, a carefully traced roof footprint typically lands within 2–5% of the true footprint. That is tight enough for a first quote or a material estimate; final orders should still come from an on-site or drone measurement.
Does the tool account for roof pitch?
Satellite imagery shows the horizontal footprint, not the sloped surface. Measure the footprint, then multiply by a pitch factor — about 1.03 for 3:12, 1.12 for 6:12, 1.25 for 9:12, and 1.41 for 12:12 — to estimate the actual surface area.
Can I get the result in roofing squares?
Measure in square feet and divide by 100 — one roofing square is 100 sq ft. The calculator shows results in square feet, square meters, and other units, and the built-in assistant can do the conversion for you.
Is it really free?
Yes. Drawing and measuring on the satellite map is free and requires no account. Creating an account lets you save and share your measured maps.