Roofing calculator: squares, bundles, underlayment and cost
Roof estimating goes wrong in one specific place: measuring the footprint and forgetting that pitch makes the actual surface bigger. A 6:12 roof is over ten percent larger than the plan area it sits on, and that gap is the difference between finishing and driving back for bundles.
Enter footprint, pitch, and your hip, valley, ridge and eave lengths, and the takeoff corrects the area for pitch, converts it to squares and bundles, and adds underlayment, ice barrier, drip edge, ridge vent, cap and fasteners — plus a tear-off disposal estimate so you can size a dumpster.
Estimates only — not a quote.
Open the roofing calculatorIncluded in the takeoff
- Pitch-corrected area in squares
- Shingle bundles with hip, valley and starter waste
- Underlayment rolls and ice barrier
- Drip edge, ridge vent, ridge cap and fasteners
- Tear-off weight and disposal estimate
Inputs
- Roof footprint and pitch
- Ridge, hip, valley and eave lengths
- Existing layer count for tear-off
- Shingle type and underlayment choice
Plan it in 5 steps
- 1Measure the footprint safely
Measure from the ground or from plans where you can. Never take unnecessary roof measurements without fall protection.
- 2Get the pitch right
Pitch corrects footprint into real surface area. A wrong pitch is the single biggest source of short orders.
- 3Measure the linear details
Ridge, hip, valley and eave lengths drive cap, starter, ice barrier and drip edge — all easy to forget and all expensive to re-buy.
- 4Count existing layers
Layer count sets tear-off weight and disposal cost. It also affects whether an overlay is even an option locally.
- 5Add pitch-aware waste
Cut-up roofs waste more. Raise the waste factor for complex hip and valley layouts.
Planning guidance only. Every quantity and price is an estimate — confirm dimensions and local requirements before you buy or build.
Run your own numbers
Enter your dimensions and get a material list, cut list and regional cost estimate in a couple of minutes. No account needed to see the takeoff.
Start estimatingBidding roofing calculator work for clients?
Contractors and handymen run this roofing calculator to build the material takeoff, nest the cut list, check permits by ZIP and hand the client a branded proposal — same visit, before the estimate goes cold.
- Takeoff priced to your ZIP in minutes
- Cut list that trims the lumber order
- Branded proposal and invoice PDFs
Material and cost output is an estimate, never a quote. Permit content is guidance to verify with your local building department.
Frequently asked questions
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