About the Metal Roofing Calculator
Metal roofing sheets, screws and flashing for a roof, allowing for side and end laps.
Also known as: metal roof sheets, corrugated sheet calculator, tin roof calculator, roofing sheets needed.
How to use this calculator
- Enter roof slope length, roof width, sheet cover width, sheet length and the other fields.
- The result updates instantly as you type — press Calculate (or Enter) at any time.
- Review the breakdown shown under the main result.
- Use Copy result or Share to save the answer or send a link with your inputs.
Formula
sheets across = roof width ÷ (sheet width − side lap)
Worked example
Using the values pre-filled in the calculator above:
- Roof slope length = 5 m
- Roof width = 12 m
- Sheet cover width = 1 m
- Sheet length = 3 m
- Side lap = 0.1 m
- End lap = 0.2 m
- Number of slopes = 2
- Price per sheet = 40
the calculator returns:
- Sheets required: 56
- Sheets across the roof: 14
- Rows up the slope: 2
- Effective cover per sheet: 0.9 m