US roofing calculators · Free · No signup
Measure once. Order the right amount.
Clear US roofing calculators for working through an estimate one task at a time: roof pitch, sloped roof area and asphalt-shingle bundles, with every layer kept visible.
Not sure where to start? Begin with the roof pitch.Example shingle order
Worked example- Length ft
- 40
- Width ft
- 30
- Pitch
- 6:12
Bundles needed45
14.76 squares
+10% waste
32.8 sq ft per bundle
Choose your task
3 calculators · 3 optional materialsStep 1 · Start here
Roof pitch & slope
Convert roof slope inputs and find the multiplier used for roof-area geometry.
Calculate roof pitchStep 2
Roof area
Estimate sloped roof surface area from a footprint and pitch or from separate measured planes.
Calculate roof areaStep 3
Asphalt shingle bundles
Turn known roof area into an asphalt-shingle order using visible waste and product coverage.
Estimate shingle quantities
Optional · Shingles
Underlayment rolls
From the effective coverage of your roll after overlaps.
Add underlaymentOptional · Shingles
Starter
From the starter length your product instructions require.
Add starterOptional · Shingles
Hip & ridge cap
From the total length of hips and ridges.
Add hip and ridge cap
Separate estimate layers
- Geometrypitch and measured area
- Wastevisible, starts at 10%
- Purchasefull bundles, rounded up
Need Materials keeps geometry and measurement, waste, and purchasing quantities separate so you can see which input changes each result.