Estimate baseboard and crown molding length for a room.
The room perimeter runs the full wall base for baseboard, minus the door opening, while crown molding covers the full perimeter. The total depends on which trim type is selected. Molding is sold by the linear foot, so perimeter math converts a room directly into the length of trim to buy.
Trim Molding
Baseboard = perimeter - door opening; crown = perimeter
Baseboard = perimeter - door opening; crown = perimeter The room perimeter runs the full wall base for baseboard, minus the door opening, while crown molding covers the full perimeter. The total depends on which trim type is selected.
Molding is sold by the linear foot, so perimeter math converts a room directly into the length of trim to buy.
This calculator takes 4 inputs: Room width, Room length, Door opening, Trim type. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.