Formula
- Use the units shown beside each field.
- Results update automatically whenever you change an input.
- Displayed values use up to four decimal places, or scientific notation for very small or large numbers. Calculations use standard floating-point arithmetic; exact integer and fraction tools identify their own precision rules.
- Uniform horizontal rows; openings, end joints, offcut reuse and extra waste excluded.
Example Calculation
- Wall height: 2400 mm
- Board face width: 150 mm
- Overlap: 20 mm
- Wall length: 4 m
Wall height = 2400 mm; Board face width = 150 mm; Overlap = 20 mm; Wall length = 4 m. Primary result: 76.
Frequently asked questions
How do I use this calculator?
Enter wall height, board face width, overlap, wall length. The result updates automatically. Use Reset to restore the example values.
What method does it use?
rows=max(1,ceil((height−overlap)/(board width−overlap))); linear meters=rows ×wall length.. Uniform horizontal rows; openings, end joints, offcut reuse and extra waste excluded.
Why might a rounded result differ?
The calculation keeps full numeric precision internally, then rounds the displayed result. Rounding intermediate steps by hand can produce a slightly different answer.
Are my inputs saved online?
No. This calculator processes your inputs in your browser. A recently used list stores only calculator names on this device, not your entered values.
Check the assumptions and units before using this result. Read about calculation methods.