Get an estimate of your roof's square footage for roofing purposes
Step 1: Find Your Property
Enter your full address or use your device's location to find your property
Device location may not be accurate.
Step 2: Draw Your Roof Outline
Click "Draw Roof" then click on the map to outline your roof. Double-click to finish.
Step 3: Select Roof Pitch & Get Estimate
4/12
The pitch multiplier accounts for the slope of your roof. Steeper roofs have more surface area.
Flat Area (from map):0sq ft
Pitch Multiplier:1.054×
Estimated Roof Area:0sq ft
Roofing Squares:0squares
What is a Roofing Square?
A "roofing square" is a unit of measurement equal to 100 square feet. Roofing materials are typically sold by the square.
Frequently Asked Questions
How do I measure my roof square footage?
Enter your address to locate your home on the satellite map, then use the Draw Roof tool to trace the outline of your roof. The calculator instantly computes the flat area and adjusts it for your roof pitch to give you the total square footage.
What is a roofing square?
A roofing square is a unit of measurement used in the roofing industry equal to 100 square feet (about 9.29 square meters). Roofing materials like shingles are typically sold by the square. For example, a 2,000 sq ft roof would require 20 roofing squares of material.
What is roof pitch and why does it matter?
Roof pitch is the steepness of your roof, expressed as a ratio (e.g., 4/12 means the roof rises 4 inches for every 12 inches of horizontal run). A steeper pitch increases the actual surface area of your roof compared to the flat footprint, meaning more roofing material is needed. Common residential roof pitches range from 4/12 to 9/12.
How accurate is this roof size estimate?
This tool provides a good ballpark estimate based on satellite imagery and the roof pitch you select. Accuracy depends on how precisely you trace the roof outline and whether you select the correct pitch. For precise measurements needed for purchasing materials or contractor bids, consult a professional roofing contractor who can measure on-site.
Can I use this tool on my phone?
Yes, this roof size estimator is fully mobile-friendly. You can search your address, draw your roof outline, and get results on any smartphone or tablet. You can also use the "Use my device location" button for faster access on mobile devices.
How do I calculate how many shingles I need?
Once you have your total roof area in roofing squares, each square typically requires 3 bundles of standard three-tab shingles. So multiply your roofing squares by 3 to estimate bundles needed. Always add 10-15% extra for waste, cuts, and starter strips.