Choose a common US mattress size or enter the actual frame, then compare physical fit with the access space you want around the bed.
Choose a common US mattress size as a starting point, or switch to Custom when you know the actual bed-frame footprint. A frame can be larger than its mattress.
Separate mattress fit from access fit
The result shows whether the bed rectangle fits physically and whether the requested left, right, foot and optional head clearances also fit. Verify doors, closets, windows and frame hardware in the planner.
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Bed Room Fit Calculator
US mattress dimensions are planning anchors. Enter the real frame footprint when it differs.
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Bed access uses the requested clearances; zero head clearance means the head may be against a wall.
Enter measurements and run the check.
Planning disclaimer: This deterministic check is not a guarantee of delivery, installation, accessibility, structural, electrical, fire-safety or feng shui outcomes.
Common US mattress dimensions
These are mattress footprints only. A frame can be larger.
Size
Mattress width
Mattress length
Twin
38 in
75 in
Twin XL
38 in
80 in
Full
54 in
75 in
Queen
60 in
80 in
King
76 in
80 in
California King
72 in
84 in
How to read the result
Physical fit: the rectangle fits in at least one orientation.
Requested access: the rectangle plus your clearances fits.
Rotate and remeasure: doors, windows, closets and actual furniture operation still need a site check.
The calculation is local-first: values stay in this page while you use it. No login, server storage, cookies or fingerprinting are needed.
Need a full room plan?
Place doors, windows and multiple furniture items together in RoomFeng's planner.
Which mattress sizes does this bed room fit calculator support?
It includes Twin, Twin XL, Full, Queen, King and California King US mattress presets, plus Custom frame dimensions. Presets are mattress footprints; actual frames can be larger.
What clearances should I enter around a bed?
Enter the clearances you actually need for bedside access and getting around the foot of the bed. The calculator does not declare a universal code minimum or accessibility standard.
Can a bed fit physically but fail the access check?
Yes. The mattress or frame rectangle may fit while the requested side, foot or head clearances do not. That distinction is why the calculator reports both results.
Optional Amazon product discovery
Recommended products
These Amazon links are optional product-discovery resources. Check dimensions, specifications, availability, and current details on Amazon.
A closet organizer product considered for room planning and everyday home use. Review dimensions, mounting or power requirements, and current availability on Amazon.
A closet organizer product considered for room planning and everyday home use. Review dimensions, mounting or power requirements, and current availability on Amazon.
A closet organizer product considered for room planning and everyday home use. Review dimensions, mounting or power requirements, and current availability on Amazon.