ROOFLINE
Roof estimates that show their work.
Measure from the ground, enter three numbers per roof section and see the area, the roofing squares and the material counts, with the formula behind every figure.
Three calculators, one roof plan
Your sections carry from one calculator to the next in the same browser tab. Nothing is uploaded and there is no account.
- Open
Roof area calculator
Footprint, overhang and pitch to sloped roof area and roofing squares, for one or several roof sections.
- Open
Roof pitch calculator
Rise and run to pitch, angle in degrees, slope percentage and the area multiplier.
- Open
Roofing material calculator
Shingle bundles, underlayment rolls, ridge and hip caps and drip edge from your own package coverage.
How an estimate is built
Footprint
Building length and width at the walls, plus the overhang on each side: 42 × 32 ft = 1,344 sq ft.
Slope
A 6:12 pitch stretches the footprint by 1.1180: 1,502.6 sq ft of roof surface.
Allowance
Add a waste percentage you choose. At 10% the order area is 1,652.9 sq ft, 16.53 squares.
Packages
Divide by the coverage printed on the product and round up: 50 bundles, 5 rolls, 2 cap bundles, 18 drip-edge pieces.
Figures computed from the calculator’s default example. How we calculate and check.
Guides
All guides- How to Measure a Roof Without Climbing on It
Footprint, overhang and pitch from the ground and the attic, with a three-section worked example and an error table.
- Roof Pitch Explained: Rise per 12, Degrees and the Area Multiplier
What 6:12 means, how to measure it without climbing, and how pitch changes the amount of roofing you need.
- Gable vs Hip vs Shed Roof: Same Area, Different Materials
Same footprint and pitch means same area. What differs is ridge, hips, edges and waste.
- Roofing Squares and Shingle Bundles: How to Convert Roof Area
From square feet to squares to bundles, with a bundle table for three packaging sizes.
- Roof Waste Factor: How Much Extra Roofing to Order
Why waste figures differ so much, and what 5, 10, 15 and 20 percent mean in bundles.
- Underlayment, Drip Edge, Starter and Ridge Cap: How Much to Order
The accessory quantities people guess: rolls after laps, drip edge with a 2-inch lap, starter and caps by the lineal foot.
- How Many Metal Roofing Panels Do I Need?
Panels are ordered by count and cut length, not by area. Here is the arithmetic for both.
- Roofing Quote Checklist: What to Prepare Before You Call a Roofer
What to measure and write down first, and the ten things a comparable written quote states.
Who runs Roofline
Roofline is published by Schiesser IT, LLC, a small software company in St. Petersburg, Florida. We are not roofers. We build the calculators, write down the method and the sources, and say where the tools stop: they give planning quantities, not a survey, an engineering assessment or a price.