The flatpacks calculator aims to compute the losses (or profits) of making flatpacks in the Construction skill. Flatpacks are made on a workbench in the workshop of a player-owned house. Different benches are required to make certain items.
For more information on making flatpacks, see the flatpacks article.
All materials are bought in the Grand Exchange, including planks and other trivial items.
Although any type of nails may be used, iron nails are used throughout the calculations. The reason for choosing Iron nails is because they are cheap, costing only 33 coins each, and they break less often than bronze nails.
Other higher-level nails may be preferable to players, but this will not affect the calculations drastically as the price difference is minimal.