Linear cutting list calculator app - optimiser - free. Use our optimizer to calculate the best way to cut lengths of steel, metal, timber or wood or any other lengths of material. Timber Product Calculators. In this section of our store, you will find a range of materials which can be ordered in custom sizes. All materials are supplied in a sawn finish as standard. We can also offer a planing service for an additional charge. This Board Foot Calculator is a free-to-use tool for converting your dimensions into board feet, the standard of measurement in the lumber industry. Simply input your dimensions and click "Calculate". You need these gaps to drain water. Determine your desired expansion gap and enter into deck calculator above. 6. Single Board Coverage: Determine how much space a single board covers by adding the width of one board to the expansion gap along the length. Then, add the length of one board to the expansion gap along the width.