Tools for RoofersField math you can check.
Calculators

Roof takeoff field desk

Roof takeoff and material calculators.
Show the math.

Practical roofing calculators that turn field dimensions into reviewable project quantities—with waste, coverage, and assumptions kept in sight.

Start with roof area
01 No account needed02 Stays in your browser03 Assumptions stay visible04 Printable order summary

Start a takeoff

Roof area from footprint and pitch

Use horizontal dimensions. The slope factor converts plan area to roof-surface area before waste is added.

Browser-local worksheet

Calculate roof area

Private by designMath stays in this browser

Example values are shown. Replace them with field measurements and verify the unit beside every entry.

ft
ft
inRise for the run entered
in
%

Complete field desk

Ten calculators. One clear takeoff.

Move from geometry to materials without hiding the coverage figures or planning allowances behind the result.

01Roof area by pitch calculatorConvert a measured horizontal roof footprint into sloped roof area using rise, run, and a visible waste allowance.02Roof pitch and angle converterConvert roof rise and run into an x-in-12 pitch, angle in degrees, percent grade, and slope factor.03Shingle bundle calculatorEstimate roofing squares and shingle bundles from roof area, waste, and the package coverage printed for your product.04Metal roofing panel calculatorEstimate equal-length metal roof panels using eave width, slope length, net panel coverage, plane count, overhang, and waste.05Underlayment roll calculatorEstimate whole underlayment rolls from sloped roof area, waste, and stated installed roll coverage.06Roof sheathing sheet calculatorEstimate whole roof sheathing sheets from roof area, waste, and actual sheet dimensions.07Ridge and hip material calculatorEstimate ridge and hip cap pieces and packages using lineal footage, installed coverage, waste, and pieces per package.08Drip edge and flashing length calculatorCombine eave, rake, valley, and other flashing runs, then estimate stock pieces with waste and end laps.09Gutter and downspout quantity calculatorEstimate gutter stock lengths, minimum downspout locations, and downspout stock pieces from measured runs and spacing.10Multi-plane roofing worksheetCalculate up to six rectangular roof planes with independent dimensions and pitches, then total measured and waste-adjusted roof area.

GUIDES & RESOURCES

Methods behind the numbers

Field-oriented references for measuring, choosing assumptions, and checking an estimate before material is ordered.

01ROOF MEASUREMENTRoof Pitch and Area Explained

Measure horizontal plan area by roof plane, apply the matching pitch factor, and document every overhang, opening, and transition.

02ROOFING WASTEChoosing a Roofing Waste Factor

Choose waste from the roof and product details; do not use one percentage to hide missing measurements or accessories.

03ROOF GEOMETRYMulti-Plane Roof Takeoff Workflow

Break the roof into non-overlapping named planes, calculate each slope separately, and keep ridge, hip, eave, rake, valley, and penetration quantities outside the area total.

04MATERIAL TAKEOFFShingles, Underlayment, and Flashing from Area

Use product-specific installed coverage for field materials, then measure every lineal accessory on its own row and round at the sold unit.

Browse all guides

Built for review

An estimate should show its seams.

1

Enter the measured geometry

Keep horizontal and sloped dimensions distinct, and work in the unit named beside each field.

2

Set product coverage and waste

Defaults are examples. Replace them with the exact package, profile, lap, and project allowance.

3

Review before ordering

Whole-unit rounding is explicit. Print the summary, check the field, then confirm against project documents.