TradeEnter the finished blank length you actually need for each leg, head or sill. An opening width is not automatically a head length. Rough openings, reveal measurements and outside long points describe different dimensions.
Count faces as well as openings
For a synthetic doorway with casing on two faces, a confirmed list might contain four 2,100 mm legs and two 900 mm heads. That is six pieces totaling 10,200 mm. The example dimensions are user-confirmed blanks; they are not derived from a doorway size.
One 2,100 mm leg and one 900 mm head need 3,016 mm with a 3 mm kerf and 5 mm at each end. They fit a 3,600 mm board and leave 584 mm. They do not fit a 2,400 mm board together.
Before accepting a proposal
Confirm each label, length, quantity and material/profile. Enter any allowance you require in the finished blank length. This calculator does not infer miters, reveals, coping, angles or installation methods.
Continue with a complete local job, or read how to record trim measurements.