Cladding packs Calculator: measuring notes and method
Use installed cover
Pack coverage is based on the exposed face after overlap. Adding up the full widths of overlapping boards would overstate the area they cover.
Detail the edges separately
List corners, starter strips, reveals and fixing accessories individually. Different board directions or patterns may need separate cutting allowances.
Formula
Packs = net area × (1 + waste ÷ 100) ÷ installed coverage per pack, rounded up.
Worked examples in metric and imperial units
Illustrative values match Reset example and stay fixed when you edit the calculator. Both columns describe the same calculation; converted inputs are rounded.
Metric worked example
- Total surface area
- 24 m²
- Coverage per pack
- 2.2 m²
- Waste allowance
- 10 %
Cladding packs to buy: 12
Imperial worked example
- Total surface area
- 258.3339 ft²
- Coverage per pack
- 23.6806 ft²
- Waste allowance
- 10 %
Cladding packs to buy: 12
Follow the calculation
- Area including allowance = 24 × 1.1 = 26.4 m².
- Divide by 2.2 m² installed coverage per pack or roll, then round up to a whole purchase unit.
Reviewed 19 October 2026. How calculations are checked · Report a correction