Free Roof & Rafter Calculators
Our free roof and rafter calculators help you calculate important roofing measurements quickly and easily. Use these tools to calculate rafter length, roof pitch, roof slope, roof angle, rise, run, birdsmouth cuts, and more.
Choose a calculator below, enter your measurements, and get your results instantly. Our calculators are designed to work on desktop, tablet, and mobile devices.
Roof & Rafter Calculators
Choose the calculator that matches your roofing or rafter measurement needs.
Rafter Calculator
Calculate rafter length, run, rise, roof angle, overhang, and total rafter length.
Calculate → 02Rafter Length Calculator
Calculate rafter length, run, rise, roof angle, and overhang from your roof measurements.
Calculate → 03Roof Pitch Calculator
Calculate roof pitch, roof angle, slope, rise, run, and rafter length.
Calculate → 04Roof Slope Calculator
Calculate roof slope, pitch, angle, rise, run, and rafter length from your measurements.
Calculate → 05Roof Angle Calculator
Calculate roof angle, pitch, slope, rise, run, and rafter length.
Calculate → 06Roof Rise Calculator
Calculate roof rise, pitch, angle, slope, run, and rafter length.
Calculate → 07Roof Run Calculator
Calculate roof run from your roof measurements, pitch, rise, angle, and related dimensions.
Calculate → 08Shed Roof Rafter Calculator
Calculate rafter length, rise, roof angle, pitch, and overhang for a single-slope roof.
Calculate → 09Rafter Cut Calculator
Calculate birdsmouth notch depth, plumb cut angle, seat cut, heel cut, HAP, and overhang rafter length.
Calculate → 10Roof Area Calculator
Calculate roof surface area from your roof dimensions, pitch, and slope to estimate material requirements.
Calculate → 11Rafter Spacing Calculator
Calculate rafter spacing and estimate the number of rafters needed along a roof run.
Calculate → 12Roof Sheathing Calculator
Estimate roof sheathing panels from your roof area, panel dimensions, and waste allowance.
Calculate → 13Roof Truss Calculator
Calculate preliminary roof truss dimensions using your roof span, pitch, and selected measurements.
Calculate → 14Roof Shingle Calculator
Estimate roofing shingles and bundles from your roof area and selected coverage or waste allowance.
Calculate → 15Roof Valley Calculator
Calculate roof valley length, horizontal run, vertical rise, and angle for compatible roof intersections.
Calculate →Find the Right Roofing Calculator
Whether you need to calculate a rafter length, determine roof pitch, find roof slope or angle, or work out a rafter cut, our collection provides simple tools for common roof and framing calculations.
Rafter Calculators
Calculate rafter length, run, rise, overhang, and rafter cut measurements.
Roof Measurement Tools
Calculate roof pitch, slope, angle, rise, and run from your measurements.
Simple & Easy to Use
Enter your measurements and get clear results without complicated calculations.
Simple Tools for Roof Calculations
Free to Use
Our roof and rafter calculators are free to use whenever you need them.
Easy to Understand
Enter your measurements and get clear results with simple explanations.
Works on Mobile
Our calculators are designed to work on phones, tablets, and desktop computers.
Calculate Your Roof Measurements in 3 Simple Steps
Choose a Calculator
Select the roof or rafter calculator that matches your needs.
Enter Your Measurements
Enter the required roof, rafter, pitch, rise, run, or cut measurements.
Get Your Result
Click calculate and get your result instantly.
Frequently Asked Questions
Are these roof calculators free?
Yes. The roof and rafter calculators on this website are free online tools.
What roof calculations can I perform?
You can calculate rafter length, roof pitch, roof slope, roof angle, rise, run, shed roof rafter length, and rafter cut measurements.
Can I use these calculators on my phone?
Yes. The calculators are designed to work on mobile phones, tablets, and desktop computers.
Are the calculator results suitable for construction?
The calculators provide mathematical estimates and preliminary layout information. Structural requirements, building codes, lumber specifications, and construction conditions should be verified before construction.
Will more roof calculators be added?
Yes. We plan to add more useful roof and rafter calculators as the collection grows.
Ready to Calculate?
Choose a roof or rafter calculator above and get your measurements quickly and easily.
Start Calculating →