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Mattress size lookup — dimensions, area, and room fit
Choose a bed size and the lookup shows its standard dimensions, how much floor it covers, and the smallest room it fits comfortably — before you buy or move a bed.
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Mattress Size Chart: Dimensions & Room Fit
A Queen mattress is 60 by 80 inches, covers 33.3 sq ft, and needs a room at least 10 by 10 feet. Pick a size below to see its dimensions, floor area, and minimum room.
The full US mattress size chart
Every size below is the US standard mattress dimension, not a brand's version of it. Floor area is width times length divided by 144, so it tells you how much of the room the bed itself occupies before nightstands, dressers, or a walking path. The minimum room is planning guidance, not a building rule: it leaves enough space to walk around the bed and open a door, but a room with a large closet, a wide doorway, or an awkward layout may need more.
| Size | Dimensions (inches) | Floor area | Minimum room |
|---|---|---|---|
| Twin | 38 × 75 | 19.8 sq ft | 7 × 10 ft |
| Twin XL | 38 × 80 | 21.1 sq ft | 7 × 11 ft |
| Full | 54 × 75 | 28.1 sq ft | 9 × 10 ft |
| Queen | 60 × 80 | 33.3 sq ft | 10 × 10 ft |
| King | 76 × 80 | 42.2 sq ft | 12 × 12 ft |
| California King | 72 × 84 | 42.0 sq ft | 12 × 12 ft |
Choosing between the close calls
The tricky choices are the pairs that look alike. Twin XL is five inches longer than a Twin, which matters for tall sleepers and dorm beds, but no wider. A Full is only six inches narrower than a Queen, yet that six inches is the difference between a comfortable couple's bed and a cramped one — a Queen is the usual pick for two adults. King and California King cover almost the same area, 42.2 against 42.0 sq ft, but in different shapes: the King is wider, the California King is longer, so tall sleepers usually prefer the California King and couples who spread out prefer the King. Measure your room first, then pick the largest size that still leaves walking space on at least two sides.
Output · formula · meaning
| Output | Formula | What it means |
|---|---|---|
| Dimensions | US standard width × length | Queen 60 × 80 inches at the default. |
| Floor area | Width × length ÷ 144 | 60 × 80 ÷ 144 = 33.3 sq ft at the default. |
| Minimum room | Planning guidance per size | 10 × 10 ft for a Queen — guidance, not a rule. |
Who uses this
- The mattress shopper: checks whether a King actually fits the bedroom before paying for delivery, and finds it needs a room at least 12 by 12 feet.
- The mover measuring a new apartment: compares the bedroom dimensions against the chart and learns a Queen needs 10 by 10 feet, not just a wall 60 inches wide.
- The parent buying a first big-kid bed: compares Twin and Twin XL and sees the XL adds five inches of length for taller kids at the same width.
- The couple choosing between King and California King: sees both cover about 42 sq ft and picks by shape — wider for sprawling, longer for height.
Accuracy & limitations
These are US standard sizes; European and UK mattress sizes differ, sometimes by several inches, so do not use this chart for imported beds. Individual brands can vary by an inch or so, and a thick frame, headboard, or pillow-top can add inches beyond the mattress itself — measure your frame, not just the mattress, before ordering or moving a bed. Minimum room sizes are planning guidance, not a rule: doors, closets, radiators, and furniture change what actually fits, so measure the room and leave walking space on at least two sides of the bed.
Cite this calculatorBright Side Kit. “Mattress Size Chart: Dimensions, Area & Minimum Room Fit.” brightoolbox.com, 2026.
Bright Side Kit. "Mattress Size Chart: Dimensions, Area & Minimum Room Fit." https://brightoolbox.com/mattress-size-chart/ Accessed October 24, 2026.Frequently asked questions
What are the standard US mattress sizes?
Twin 38 by 75 inches, Twin XL 38 by 80, Full 54 by 75, Queen 60 by 80, King 76 by 80, and California King 72 by 84. Those are mattress dimensions; frames and headboards can add inches.
How big is a Queen mattress?
60 by 80 inches, covering 33.3 sq ft. Plan on a bedroom at least 10 by 10 feet so there is walking space around the bed.
What is the difference between a King and a California King?
Shape, not size: a King is 76 by 80 inches and a California King is 72 by 84, so both cover about 42 sq ft. The King is wider, the California King is longer, so tall sleepers usually prefer the California King.
What is the difference between a Twin and a Twin XL?
Length only: both are 38 inches wide, but a Twin XL is 80 inches long against 75 for a Twin. The extra five inches suits taller sleepers and is the standard dorm-bed length.
What size room do I need for a King bed?
At least 12 by 12 feet as planning guidance, which leaves walking space around a 76-by-80-inch bed. Doors, closets, and other furniture may push the real minimum higher.
Are mattress sizes the same in Europe and the UK?
No — European and UK sizes differ from US standards, sometimes by several inches. This chart covers US sizes only; check the local standard before buying an imported bed.
Should I measure the mattress or the frame?
Measure the frame, not just the mattress. Frames, headboards, and pillow-tops can add inches on every side, and the frame is what has to fit through doors and into the room.
Is the minimum room size a rule?
No, it is planning guidance: enough space to walk around the bed and use the room comfortably. A room with a big closet, an awkward door, or lots of furniture may need more space than the chart suggests.