Better Roof Calculators. No Strings Attached.
We built the tools we wished existed — fast, accurate, and free from the clutter of ads and paywalls that plague every other roofing calculator on the web.
Why We Built This
Try searching for "roof slope calculator" and you'll find the same frustrating pattern: tools buried under pop-up ads, paywalls for basic features, outdated interfaces that barely work on mobile, and results you can't quite trust.
We're builders and developers who got tired of this. We needed a roof calculator that just works — one that gives you pitch, angle, slope percentage, and rafter length in real time, with a visual diagram that actually helps you understand what the numbers mean.
So we built one.
What Makes Us Different
Runs in Your Browser
All calculations happen locally — nothing is sent to a server. Your measurements stay on your device, and the results are instant.
Interactive Visualization
Most calculators spit out numbers. Ours shows you a real-time SVG roof diagram that changes as you type, so you can see what a 6:12 pitch actually looks like versus a 10:12.
Complete Results
Pitch (X:12), angle in degrees, slope percentage, pitch multiplier, rafter length, material recommendations, and slope category — all from a single calculation.
No Account Required
No sign-ups, no email gates, no "premium" tiers. Every feature is available to everyone, immediately.
Our Commitment
RoofSlopeCalculator.org will always be free to use. We support the site through non-intrusive advertising that doesn't interfere with the tool experience.
We're continuously improving our tools — adding new calculators, expanding educational content, and optimizing for every device and screen size. If there's a roofing calculation you need that we don't offer yet, we want to hear about it.
Get in Touch
Have a suggestion, found a bug, or just want to say hello?
[email protected]