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Who We Are
About Roof Pitch Calculator
We build simple, accurate construction tools that anyone can use — no sign-up, no cost, no clutter.
Our Mission
Roof pitch is one of the first numbers you need on any roofing project, yet it is easy to get wrong. We created roof-pitchcalculator.com to make that calculation instant and reliable. Whether you are estimating shingles for a garage, designing a new extension or simply curious about the slope of your own house, our tool gives you the pitch ratio, the angle in degrees, the slope percentage and the roof pitch multiplier in seconds.
What We Offer
Our calculator works on every device, supports both imperial and metric units, and updates results live as you type. Alongside the tool we publish clear, jargon-free guides on how to calculate roof pitch, how to measure it on-site, and how to read a roof pitch chart. Every formula we use — rise over run, the arctangent angle conversion and the surface-area multiplier — is shown openly so you can check our maths.
Accuracy & Sources
The figures produced by this site are based on standard trigonometry and widely accepted construction practice. They are intended for planning and estimation. Building codes, material specifications and minimum-pitch requirements vary by country and region, so we always recommend confirming critical figures with a qualified professional and your local authority before you build or buy.
Independent & Free
This is an independent project. The calculator is free to use and supported by limited advertising and analytics that help us understand how the tool is used. We never charge for results and never put core features behind a paywall.