Calculators
roofangler
3 input modes · rafter length · free
Free online tool for calculating roof pitch, angle in degrees, slope percentage, and rafter length — with three input modes and a live diagram.
The problem
Roof pitch is one calculation with three conventions — rise/run, angle in degrees, pitch ratio — and most calculators force you to pick a single input mode. Anyone sanity-checking a contractor's number ends up converting between conventions by hand.
What we built
roofangler accepts all three input modes and converts between them as you type. It computes pitch, slope percentage, rafter length, and rafter multipliers — with companion guides explaining the underlying geometry for DIY users.
- Three input modes: Rise & Run, Angle, Pitch Ratio
- Computes pitch, slope percentage, rafter length, and rafter multipliers
- Long-form guides on shed roofs, calculation methods, and the Roof Pitch Factor
- Free, no account, no advertising
What's live
- Three input modes (Rise & Run, Angle, Pitch Ratio) with live conversion
- Outputs pitch, slope percentage, rafter length, and rafter multipliers
- Blog covers shed roofs, calculation methods, and roof pitch factors
- Results disclosed as informational — verify with a licensed contractor