Bedroom Mattress Size Fit Planner

How to use this tool

1. Measure the wall the headboard will sit against and the distance to the opposite wall, and enter both in feet (12 feet 6 inches is 12.5).
2. Choose the mattress size you are considering, enter the combined width of your nightstands, and set the walkway you find comfortable.
3. Read the clearance on each side and at the foot, check the verdict, and try the next size down if the walkways fall short of your target.

What the math assumes

• Mattress dimensions are the standard US sizes: Twin XL 38 x 80, Full 54 x 75, Queen 60 x 80, King 76 x 80, California King 72 x 84 and Split King 76 x 80 inches. Some luxury makers offer oversized or custom sizes that you should measure separately.
• The bed is centered on the headboard wall with the headboard flush against it, and the nightstands sit beside the bed on that same wall, so the leftover width is split evenly into two walkways.
• The frame, headboard and footboard are treated as adding no width or length beyond the mattress; add your frame's extra inches to the nightstand total or subtract them from the room length.
• The 30-inch walkway default is a planning preference, not a building code requirement; adjust it to your taste, furniture or mobility needs.
• Doors, closets, radiators and windows are not modeled. Measure to the nearest obstruction rather than the wall if one is in the way.