The desired gap determines how many full-width boards fit between the two edge clearances. Any remaining width is redistributed as the actual gap between those boards. For one board there are no internal gaps. The result is geometry only; it is not a recommendation for drainage or seasonal movement spacing.
Worked reference example
Illustrative inputs in metres and SI units; the price is an example entered by the user, not a market quotation. Numeric reference verified by the automated test suite.
- Width
- 3
- Board width
- 0.14
- Joint / board gap
- 0.003
- Edge clearance
- 0.01
- Price per purchase unit
- 2
- Result
- 20
- Cost (example currency units)
- 40
Calculation method
n = floor((W − 2e + j)/(w + j)); jᵣ = (W − 2e − n × w)/(n − 1)Measure. Calculate. Build.
- Use actual dimensions and split complex rooms into rectangles.
- Allow for cuts, joints and package sizes. Compare stock formats.
- Combine your results in a shopping list you can save and print.
Sources & limits
Planning estimates; verify measurements and product data before purchasing.
Prices are supplied by you. Area estimates do not establish a feasible cutting arrangement. These tools do not assess structural loads or issue construction approvals.