Rafter & Truss Calculator

This calculator is for general informational purposes only. Please verify all results with a licensed contractor, as actual project requirements may vary.

Key Features

✔ Clean, intuitive interface for quick and easy input of rise and run measurements.
✔ Real-time rafter length calculation using the Pythagorean theorem.
✔ Flexible calculation basis lets you choose between rise & run or roof pitch.
✔ Auto-converts between feet and inches for greater measurement accuracy.
✔ Instant result sharing for contractors, builders, or estimators.
✔ Fully responsive design—works smoothly on mobile, tablet, and desktop.

How to Use It

Calculate Rafter Length:
Input your roof’s rise (vertical height) and run (horizontal span), and the calculator instantly computes the rafter length based on your inputs—no need for manual math or construction calculators.
Choose Your Method:
Select your preferred calculation basis: either enter rise and run or switch to a different method like pitch-based inputs. The calculator adjusts automatically, giving you accurate results however you build.
Precision Made Simple:
Get the precise rafter length you need to plan for cuts, material orders, or project estimates—ideal for trusses, rafters, and framing work.
Built for Professionals & DIYers:
Whether you're a seasoned contractor or a homeowner planning a shed or roof extension, this tool helps eliminate guesswork and ensures correct measurements from the start.

Build with Confidence

Our Rafter & Truss Calculator helps streamline planning and reduce errors, making it easier to source materials and stay on budget. It’s a must-have tool for any roofing or framing project—big or small.

Start building smarter with the LS Rafter & Truss Calculator today.