Roofing Calculators Built for the Job Site
Roofer Toolkit is a free collection of framing and layout calculators built for anyone working on a roof — contractors, framers, and serious DIYers. Large numbers, fractions, and results you can actually use at the saw.
Built from 18 years of field experience
These calculators were built by someone who has spent 18 years in roofing, siding, and residential construction. The inputs, outputs, and diagrams are designed around how these calculations are actually used on a job — not how they look in a carpentry textbook.
The Calculators
Accuracy & Disclaimer
The math in these calculators is based on standard rafter framing geometry. Results are displayed in fractions to the nearest 1/16” for use at the saw. Always double-check critical measurements before cutting.
These tools are for reference only. Local building codes, structural loads, and lumber grades all affect what’s safe and permitted. Consult a qualified professional and your local building authority before starting any structural work.