Important Professional Notice
This tool provides mathematically verified calculations based on standard roofing formulas. Results are estimates for planning purposes only. Always verify critical measurements on-site and consult with structural engineers or building professionals for final design and construction decisions. Local building codes and site-specific conditions must be considered.
Calculate Pitch, Rise, Run, Rafter Length & Roof Area
Professional Use Guidelines
This calculator uses industry-standard formulas that have been mathematically verified. It's designed to assist with planning and estimation, but all critical measurements should be verified on-site. Complex roof designs, irregular shapes, or special conditions may require additional calculations beyond this tool's scope.
Calculate Roof Pitch
Calculate pitch from rise and run measurements
Calculate Rise from Pitch
Determine total rise using pitch ratio and run length
Calculate Rafter Length
Estimate rafter length from building width and pitch
Calculate Roof Area
Estimate roof surface area including pitch factor
Calculation Results
Professional Verification Recommended: These results are based on the inputs provided and standard mathematical formulas. For construction purposes, verify all measurements on-site and consider local building codes, material specifications, and project-specific requirements.
No calculation performed yet. Enter measurements above to begin.
Limitations & Important Professional Notes
Estimation Tool: This calculator provides estimates based on standard formulas. Actual construction requirements may vary.
Site Verification Required: Always verify critical measurements on-site before ordering materials or beginning construction.
Complex Roof Designs: Hip roofs, valleys, dormers, irregular shapes, and complex designs require additional calculations beyond this tool's scope.
Building Codes: Local building codes, snow loads, wind zones, and other regional factors must be considered for structural requirements.
Material Waste: Calculations do not include standard waste factors (typically 10-15% for roofing materials).
Professional Review: For structural elements or commercial projects, consult with licensed professionals.
Overhangs & Extensions: Basic calculations assume standard gable ends without overhangs unless manually added to inputs.
Measurement Accuracy: Results are only as accurate as the measurements entered. Double-check all inputs.
Best Practices for Professional Use:
1. Use this tool for initial estimates and planning
2. Verify all calculations with on-site measurements
3. Consult local building codes and regulations
4. Add appropriate waste factors for material ordering
5. For complex projects, engage architectural or engineering professionals
How To Use This Roof Calculator
Step 1: Choose Calculator Type
Select from four specialized calculators:
Calculate Roof Pitch - Convert rise/run measurements to pitch
Calculate Rise - Determine vertical rise from pitch and run
Calculate Rafter Length - Estimate rafter size from building width
Calculate Roof Area - Estimate surface area including pitch
Step 2: Enter Accurate Measurements
Input your measurements carefully. Use consistent units within each calculation.
For pitch inputs, enter the first number only (e.g., for 4/12 pitch, enter 4).
Step 3: Select Appropriate Units
Choose feet, inches, or meters for each calculator. All inputs in one calculator should use the same units.
Step 4: Review and Verify Results
Results display with your inputs and calculated values. Use the print function for documentation.
Important: Always verify critical calculations with on-site measurements.