Furniture Fit Calculator

The number that matters is clear width, not door width

A 32-inch door is not 32 inches wide when the door is open. The hinges, the stop the door closes against, and the trim around the frame all take up space, and the slab itself blocks part of the opening when it swings back. Take a tape measure to an open door and you will find 29 to 30 inches of usable width, which is 2 to 3 inches less than the label.

Height loses a little too. A standard interior door is 80 inches tall, and the threshold or a thick floor covering takes about an inch, so plan on 79 inches of clear height. This calculator subtracts both before it does anything else, and that subtraction is where most "it fit in the store" surprises come from.

Measure the narrowest point in the whole path, not the door you walk through every day. A hallway that pinches to 30 inches, a stair railing that sticks out, or a turn at the top of a landing can be tighter than the doorway, and the furniture has to clear all of them. If you measure one thing, measure the tightest spot.

Only two dimensions decide whether it goes through

A sofa has three measurements, but the doorway only sees two of them at a time. The long dimension runs along the direction of travel, and the other two form a cross-section that has to fit inside the opening. Which two depends on how you turn the piece.

Stand a sofa upright and push it through lengthwise and the cross-section is depth by height. Tip it onto its back and the cross-section becomes depth by width, which is usually worse. Lay it on its side and the cross-section is height by depth, which is usually the best option for anything deep and low.

The rule that comes out of this: the smallest of the three dimensions has to be smaller than the clear width, and the second smallest has to be smaller than the clear height. A sofa 84 inches long, 36 inches deep and 30 inches tall has a 30-inch smallest dimension, so it needs at least 30 inches of clear width in the orientation where that 30-inch side faces the door. If the clear width is 29.5 inches, the piece is half an inch too wide and has to be tilted.

This is why a long, low dresser often goes through a door that a shorter, deeper armchair cannot. Length is nearly free, because it runs through the opening. Depth is what stops you, and depth is the number most people forget to write down in the store.

Worked example: an 84-inch sofa through a 32-inch door

The door is 32 inches with 2.5 inches lost to the stop and trim, so the clear width is 29.5 inches and the clear height is 79 inches. The sofa is 84 inches long, 36 inches deep and 30 inches tall.

The best orientation is the one that sends the smallest dimension through the door. Here that is the 30-inch height going through the opening with the 36-inch depth standing up, which leaves a width margin of -0.5 inches and a height margin of 43 inches. Negative means it does not walk straight in.

The cross-section diagonal saves it. A 30 by 36 inch rectangle has a diagonal of 46.9 inches, and the door opening has a diagonal of 84.3 inches. There is plenty of room to rotate the piece inside the opening, so the verdict is that it fits when tilted, with the 30-inch side passing a 29.5-inch gap.

Widen the door to 36 inches and the clear width becomes 33.5 inches. The same sofa now walks straight through with 3.5 inches to spare and no tilting at all. That is the whole difference between a two-person job and a three-person job with a scratched door frame.

Why the diagonal decides more than any single side

Push a box through an opening and it can rotate in the plane of the doorway. The space it needs is not its width but its width and height combined, and the diagonal is the measure of that combined footprint. When the item's cross-section diagonal is smaller than the opening diagonal, the piece can be walked through at an angle even when one side is wider than the door.

The jamb depth is what makes the trick work. An interior wall is about 4.5 inches thick, so the piece can start its turn inside the opening rather than in front of it. In practice that buys roughly 4 inches of extra width on a hard item and more on anything upholstered, because a sofa cushion compresses. This calculator allows 4 inches of tilt room on top of the clear width before it calls an item too wide.

The diagonal does not rescue everything. A 42-inch-deep refrigerator has a 42-inch smallest dimension, and no amount of rotation gets 42 inches through a 29.5-inch opening. The diagonal test only helps when the item is close to fitting, which is the case for most furniture and almost never the case for appliances.

Height matters here as well. Tilting a tall piece lowers its top corner, but it also raises the bottom corner, and a 79-inch opening runs out of room fast. A 70-inch-tall bookcase tipped 20 degrees needs about 66 inches of vertical space plus its depth, which is why tall items usually go through standing up or not at all.

Stairs, corners and the turn at the top

Getting through the front door is half the job. The other half is the stairwell, and a stairwell is a narrower, taller doorway with a turn at the end of it.

Carrying an item up a stair needs clearance for hands on both sides. The working rule is the item's thickness plus 6 inches, so a 30-inch-thick sofa wants a 36-inch stairway, which is the code minimum for a residential stair anyway. A 42-inch-thick piece needs 48 inches, and most homes do not have that.

The turn at a landing is the harder constraint. To pivot a long piece around a 90-degree corner, the landing needs roughly half the item's length in depth. An 84-inch sofa needs about 42 inches of landing, and a typical landing is 36 inches. That is why movers sometimes take a sofa over a balcony instead of up the stairs, and why a "it will fit through the door" answer is not the same as "it will get to the second floor".

Ceiling height matters on a stair too. A long piece carried at an angle sweeps upward, and the headroom above the stair, not the stair width, becomes the limit. If the stair runs under a low soffit, measure the vertical clearance at the tightest step, not at the bottom.

Elevators, hallways and the last ten feet

An elevator door is narrower than its frame by about 2 inches, so a 36-inch elevator door gives 34 inches of clear opening. That is wider than most apartment doors and usually not the problem. The cab is the problem: an 84-inch sofa does not fit in a 60-inch-deep cab unless it stands on end, and standing it on end needs 84 inches of cab height, which most elevators do not have.

The practical test is the cab diagonal. Measure the cab floor from corner to corner and the cab height, then compare with the item's length. A 5 by 7 foot cab has a floor diagonal of about 103 inches, which swallows an 84-inch sofa laid flat. A 4 by 5 foot cab has a 77-inch diagonal, and the same sofa has to go on end or up the stairs.

Hallways add their own limits. A 36-inch hallway with a 90-degree turn into the apartment needs a clear square at the corner roughly the size of the item's depth plus 6 inches. Furniture that fits the door and the elevator can still fail at a corridor corner, and the failure shows up after the truck has been unloaded.

Two cheap fixes exist. Removing the door from its hinges gains the thickness of the slab, usually 1.75 inches, plus the stop, which is often enough to turn a tilted pass into a straight one. Removing the legs from a sofa or the doors from a wardrobe can take 4 to 6 inches off the governing dimension, and both are reversible in ten minutes with a screwdriver.

Measure it in five minutes, then decide

You need four numbers for the item and three for the path. Write them on your phone before you go to the store, because the showroom tag lists width and height and almost never lists depth.

Round in the safe direction. A measurement of 29.75 inches is 29.5 when you are deciding whether to buy, because the door frame is not perfectly square and the floor is not perfectly level. Half an inch of slack is the difference between a piece that goes in and a piece that comes back on the truck.

If the numbers say it will not fit, the options are to remove the door, remove the legs, take the piece apart, bring it in through a window or a sliding door, or choose a different piece. What does not work is forcing it: a sofa frame that is 1 inch too wide for a doorway will not compress, and the damage shows up as a cracked frame rather than a scratch.

The ADA standards published by the Access Board set 32 inches as the minimum clear width for a public doorway, which is a useful reference point: a 32-inch door is the narrowest opening most buildings allow, and it is also about the tightest door in a typical apartment. The Department of Justice ADA site explains the same requirement in plain language.