Roof Sheet Calculator
A free, browser-based calculator. Runs entirely in your browser — no sign up, nothing stored.
100% FreeRuns in your browserBasic
Enter Values
Enter your values and press Calculate to see results.
How to use this calculator
- Enter the width to cover (m) and the sheet's effective (laid) cover width (mm).
- Read the sheets per row.
How it works
Sheets per row = width ÷ effective cover width, rounded up.
Worked example
12 m wide, 760 mm cover. = 16 sheets per row.
Common mistakes
- Using the total sheet width instead of the laid cover width (sheets overlap).
- Forgetting end laps and extra rows for long roofs.
Frequently asked questions
What's effective cover width?
The width a sheet covers once lapped with the next — always less than the full sheet width. Check the profile's spec.
Related tools
Tip: Enter any known values to calculate the remaining results.
All calculations run in your browser. Your inputs are never saved or transmitted.