Use the dimensions that will arrive.
If furniture ships boxed, use the package dimensions. If it arrives assembled, measure its widest and tallest points, including arms, handles, and projecting feet.
Before you move it.
Measure it.
Explore how a furniture box or assembled piece fits through one doorway. Rotate its dimensions, add clearance, and see every straight-through orientation.
Turn it over in your mind.
A rectangular-box opening check only. No diagonal threading, wall thickness, approach space, turns, stairs, elevators, or disassembly simulation.
A considered
way to work.
A useful tool makes your choices clearer. Start with the details you know, explore the alternatives, and keep the parts worth taking further.
Measure the clear opening.
Use the space actually available after accounting for the door, trim, and handles. The margin entered here is applied on both sides of the box in each cross-section.
Check the route separately.
This checks six axis-aligned orientations through one opening. It does not model diagonal threading, wall thickness, room to approach, hallway turns, stairs, elevators, or a moving crew. Passing this check is not a delivery guarantee.