Calculator Inputs and Outputs
Inputs
- Roof length (ft) — example: 48
- Slope length eave to ridge (ft) — example: 18
- Roof planes — example: 2
- Panel coverage width (in) — example: 36
- Waste allowance (%) — example: 10
- Price per linear foot — example: 4.75
Results
- Panels required (panels)
- Purchased panel feet (linear ft)
- Roof area with waste (sq ft)
- Estimated panel cost
Formula used
Panels per plane = roof length ÷ panel coverage width; purchased length includes slope length and waste.
How to Use the Metal Roofing Calculator
Enter the requested values, review the units, and select Calculate Metal Roofing. The calculator uses the default values as a working example and updates the result when you calculate.
Formula
Panels per plane = roof length ÷ panel coverage width; purchased length includes slope length and waste.
Understanding the Results
The main answer is shown first, followed by supporting values that help you verify assumptions or compare related quantities. Internal calculations retain more precision than the rounded display.
Practical Accuracy Tips
Use consistent units, enter measured values rather than guesses when possible, and include realistic allowances for waste, fees, timing, or uncertainty where the calculator provides them.
Important Note
This calculator provides an informational estimate. Verify critical financial, health, construction, scientific, tax, legal, or safety decisions with an appropriately qualified professional.
Calculation Standards
This tool uses documented formulas and high-precision internal values. Displayed results may be rounded for readability. Review the assumptions and verify important decisions with a qualified professional.
Read our calculation methodology