Roofing calculators

Rise over run to pitch, angle and the slope multiplier that corrects your plan area.

rise / run · degrees · multiplier

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Footprint and pitch to roofing squares, with the waste factor the roof shape actually needs.

sq ft → squares · waste %

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Squares to bundles, starter course, ridge cap and nails — the whole material takeoff.

squares → bundles · pieces

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Squares, material and pitch to an installed cost range with the takeoff behind it.

squares · $ / square · range

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Plan dimensions and pitch to true roof area for gable, hip and shed shapes.

ft × ft · pitch → sq ft

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A printable bid sheet: line items, waste, labour, warranty terms and a total.

line items · $ total

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Span, pitch, ridge and overhang to common rafter length, cut angles, hip or valley length and the board to order.

span · pitch → ft-in · degrees

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Squares and panel system to an installed range, with the panel and trim takeoff.

squares · panel type · range

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Area, membrane, tear-off and deck repair to an installed low-slope range, with the takeoff and service life.

sq ft · membrane · range

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Rolls of felt or synthetic plus ice-and-water membrane, with the double layer below 4:12 and the 24 in eave rule.

squares · rolls · lin ft

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A printable walk of the roof by zone: ridge, field, valleys, flashing, gutters, penetrations.

6 zones · printable

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Net free area at 1:150 and 1:300, split intake and exhaust, and the vent count it takes.

sq ft → NFA in² · vent count

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A printable contract skeleton: scope, payment schedule, change orders, warranty.

9 clauses · printable

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A printable invoice that carries the takeoff line items straight through to the total.

line items · $ total

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Linear feet and material to an installed range, with downspouts priced by the foot.

linear ft · $ / ft · range

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Ground snow load to flat-roof and sloped-roof load using the ASCE 7 factors.

psf ground → psf roof

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Job costs, overhead and a target net margin to a bid price, with the matching markup.

$ cost → $ bid · margin %

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