Measure the real run first, then convert it into the stock lengths you can actually buy. For decking, keep the surface-board layout and the supporting joist quantity as separate checks rather than hiding them inside one generic estimate.
The four tools use the dimensions and supplier or system data you enter. None assumes one stock length, waste percentage, board gap or joist spacing for every job.
Start with a measured wall run or rectangular room perimeter, deduct only the real openings that will have no skirting, then convert the net run into the supplier's actual board length.
Already have a cutting-list total? Convert the required linear metres into whole merchant stock lengths using the actual length you intend to buy. The result stays separate from cut optimisation.
Choose the board-run direction and use the actual deck dimensions, board face width, planned gap and supplier stock length. The tool keeps board rows, net linear metres and stock-board equivalents separate.
Count simple field joist lines and net joist metres from the actual frame dimensions and the chosen decking system's specified maximum centres. Optional stock conversion remains a purchasing check, not structural design.
Use the two decking calculators when you want to inspect one quantity closely. Use the project planner when you want surface boards, joists and related deck materials brought into one broader estimating route.
Use these when you need help with the measurement or material-planning step before entering quantities.
Timber quantities are affected by the real layout and the stock you can actually buy. A total number of linear metres can be useful for purchasing, but it does not prove that individual required cuts will fit efficiently into those stock lengths.
These are quantity estimators, not cutting optimisers, structural span calculators or fixing specifications. Verify final quantities against drawings, the chosen product/system guidance, merchant stock and the actual site before ordering.
