6 calculators in this category
- Roof Pitch CalculatorIRC 2021 R905 slope limitsRoof pitch is written as rise in inches over a 12-inch run, but almost every calculation you need it for wants a different…
- Roof Area CalculatorSlope-factor method; 1 roofing square = 100 ft²You can take off an entire roof from the ground. Measure the building's length and width, read the pitch off a rafter or a…
- Rafter Length CalculatorIRC 2021 R802 rafter framingA common rafter is cut to a line length — the distance along its top edge from the ridge plumb cut to the heel of the…
- Shingle Bundle & Roofing Squares CalculatorIRC 2021 Chapter 9 (Roof Assemblies)Enter the sloped area of your roof and this calculator returns the full asphalt-shingle takeoff: roofing squares including…
- Hip & Valley Rafter Length CalculatorEqual-pitch hip and valley geometryGive this calculator the common rafter run and the roof pitch and it returns everything you need to cut a hip or a valley: the…
- Rafter Birdsmouth & HAP CalculatorIRC 2021 rafter notch limitsThe birdsmouth is the notch that lets a sloping rafter sit flat on a level top plate. Get it wrong and you either lose bearing…
Which one do you need?
- Roof Pitch Calculator
- Convert roof pitch to degrees, percent slope and the slope factor used in every roof takeoff. Enter x:12, an angle, a percent, or a measured rise and run.
- Roof Area Calculator
- Work out true sloped roof area and roofing squares from a ground-level footprint, pitch and overhang, for gable, hip and shed roofs. No ladder needed.
- Rafter Length Calculator
- Calculate common rafter line length, tail length, overall cut length, plumb and seat cut angles and rafter count from span, pitch, ridge and overhang.
- Shingle Bundle & Roofing Squares Calculator
- Turn sloped roof area into roofing squares, shingle bundles, starter and ridge cap, underlayment rolls and nail pounds, with a waste allowance you control.
- Hip & Valley Rafter Length Calculator
- Calculate hip and valley rafter length, plumb and cheek cut angles, and the jack rafter common difference for an equal-pitch hip roof, with a full jack schedule.
- Rafter Birdsmouth & HAP Calculator
- Size a rafter birdsmouth: seat cut length, plumb heel height, height above plate, remaining depth and whether the notch stays inside the code depth limit.