Bed size room fit calculator
Pick a bed size, add the frame around the mattress, then drag everything around the plan. The walking space updates as it moves, and the page names the largest standard bed that still works where the bed is sitting.
Waiting
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Enter your room and pick a bed size to see whether it works.
- Frame footprint—
- Largest bed that fits—
- Room this bed wants—
- Blocked—
| Side | Gap | Enough? |
|---|
Drag the bed or a nightstand to move it. The dashed band is the walking space you asked for, and the hatched boxes are the door and closet. Objects can be focused with the Tab key: arrow keys move the focused object, and the [ and ] keys turn it.
Wall to wall, left to right on the plan. Type 12' 6" if you like.
Wall to wall, top to bottom on the plan.
The mattress on its own. The frame around it is added below.
Head to foot. A king and a queen are the same length.
One side only, and this is the number people forget. Measure your frame: many add 1 to 3 in, and a storage base or a padded headboard adds more.
What you want beside the bed to walk and to make it. People tend to work to 24–30 in. It is a convention, not a rule.
36 in is the figure most people use for a main route through a room. Drop it if nobody walks past the end.
Measure yours. Around 20 to 24 in is common.
The two can be different sizes.
How far both of them stick out from the wall.
The door leaf. Its swing is drawn as a square the same size, which is the floor an open door sweeps.
How wide the opening is along the wall.
Enough to open it and stand there. A sliding door needs less than a hinged one.
What this assumes
- The bed is measured as a plain rectangle. A sleigh bed, a four-poster or a frame with a wide skirt is not a rectangle at floor level, so measure the widest point and use that.
- The head end asks for no space. A headboard against a wall is how beds are meant to sit, so the page only grades the two sides and the foot.
- Nightstands are checked, not required. They have to be inside the walls and clear of the bed. They are allowed to sit in the walking space, because that is where a nightstand goes.
- Walking space may lie over the door or the closet. It is the same floor at different moments: a closed door gives it back, and you stand on it to reach a shelf. Only the bed and the nightstands have to stay out of those boxes.
- "Room this bed wants" is the bed alone. It squares the bed up to the walls and adds the gaps you asked for. It does not include the nightstands or the closet.
- Nothing else in the room is counted unless you draw it. A radiator, a dresser or a window seat all take floor this plan does not know about.
The one figure that decides tight from doesn't fit is below. A side narrower than this counts as blocked. Your own shoulder width is a fair starting point.
Nothing here treats a clearance as a rule. This is your line, not ours.
How this calculation works
- Mattress size
- Add the frame overhang
- Add the space you want
- Compare with the walls, door and closet
frame = mattress + 2 × overhang; room needed = frame + 2 × side gap across, + foot gap along
The mattress is the number on the label. The frame is the number that has to fit. Rails, a headboard and a padded surround all push the footprint out past the mattress, and two inches a side turns a 60 inch queen into a 64 inch object. That is the step this page exists to catch.
The three verdicts mean different things. Fits means every open side has the space you asked for. Tight means you can still get past, but with less room than you wanted. Doesn't fit means something solid is in the way: the frame is through a wall, a nightstand is on top of the bed, the bed is across the door swing, or a side is narrower than the gap you said you would squeeze through.
| Size | Mattress | Frame | Smallest room |
|---|---|---|---|
| Twin | 38 × 75 in | 42 × 79 in | 8' 6" × 9' 7" |
| Twin XL | 38 × 80 in | 42 × 84 in | 8' 6" × 10' |
| Full (double) | 54 × 75 in | 58 × 79 in | 9' 10" × 9' 7" |
| Queen | 60 × 80 in | 64 × 84 in | 10' 4" × 10' |
| California king | 72 × 84 in | 76 × 88 in | 11' 4" × 10' 4" |
| King | 76 × 80 in | 80 × 84 in | 11' 8" × 10' |
The frame is what has to fit
People plan a bedroom around the mattress size and then find the bed is four inches wider than they measured for. Set the overhang to zero and watch the plan: a queen in a ten foot room looks comfortable. Set it to two inches and the walking space on each side drops by two inches. Set it to four, which is normal for a storage base, and the room starts to fail.
Measure it on the bed you already own. Put a tape on the floor against the side rail, then push it under the mattress until it hits the edge. That gap, on one side, is the number to type in.
Where the door opens matters more than the bed size
A door needs a quarter circle of empty floor the width of the leaf. Tick the door on, pick its wall, and drag it along that wall to where yours is. If the bed lands in the swing the page calls it a hard no, because no amount of clearance fixes a door that hits the bed.
The same is true of a closet. Its doors need floor to open into, and you need somewhere to stand while you look inside. Both are drawn as boxes that must stay empty.
A king is wider, not longer
A king and a queen are both 80 inches long. The king is 16 inches wider. So the question is almost never whether the room is long enough — it is whether you can still walk down both sides. A California king swaps four inches of width for four inches of length, which helps in a long narrow room and hurts in a short wide one.
That is what the "largest bed that fits" figure is for. It tries each standard size in the spot your bed is already in, keeping the head against the same wall and sliding the nightstands out with it, and names the biggest one that still works.
Common questions
What size room do you need for a queen bed?
A queen mattress is 60 by 80 inches. On a frame that runs 2 inches past it on each side, the footprint is 64 by 84 inches. Leave 30 inches to walk at each side and 36 inches at the foot and the room wants to be about 10 ft 4 in by 10 ft. Those gaps are a convention, not a rule, so the calculator takes them as inputs.
Are US mattress sizes a standard?
They are a trade convention rather than a standard published by one authority. The figures used here are the ones the US trade normally quotes, and a given maker can be an inch either way. Measure the mattress you own, or read the maker spec for one you are buying.
How much space do you need to walk around a bed?
People usually work to 24 to 30 inches beside a bed, and 36 inches for a main route through a room. None of those is a requirement. What matters is whether you can get past, make the bed and open a drawer, so the calculator lets you set the figure yourself.
Once the bed fits the room, the next question is whether it will get into the room — see will furniture fit through a door. For the measuring, read what size bed fits my room.
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