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.
- Straight parallel layout with no reuse of cutoffs between rows. End joints, support and fastening design are excluded.
Example Calculation
- Deck width across boards: 3 m
- Deck length along boards: 4 m
- Board width: 140 mm
- Gap: 10 mm
- Stock board length: 4 m
3 m across 140 mm boards with 10 mm gaps needs 21 rows; at 4 m lengths, 21 stock boards.
Frequently asked questions
How do I use this calculator?
Enter deck width across boards, deck length along boards, board width, gap, stock board length. The result updates automatically. Use Reset to restore the example values.
What method does it use?
rows=ceil((width+gap)/(board width+gap)); pieces per row=ceil(deck length/stock length).. Straight parallel layout with no reuse of cutoffs between rows. End joints, support and fastening design are 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.