King mattress room-space estimates: US vs UK
Planning estimate, not a building-code minimum: US King mattress-only: about 3.15 m (10 ft 4 in) wide by 2.64 m (8 ft 8 in) long; UK Standard King in IKEA MALM Standard King frame: about 2.88 m (9 ft 5 in) wide by 2.70 m (8 ft 10 in) long. The model applies the source-backed approximately 24-inch side allowance and a separate FitWise-assumed 24-inch foot allowance to each market-specific mattress footprint. Only entries naming a frame include that specific sourced model; other entries are mattress-only. Nightstands, wardrobe/dresser access, doors and circulation are excluded; measure the actual setup before buying.
US King mattress
- Market
- US
- Mattress width
- 193.0 cm6 ft 4 in
- Mattress length
- 203.2 cm6 ft 8 in
- Mattress-only physical width
- 193.0 cm6 ft 4 inMattress-only footprint; frame not measured.
- Recommended clear room width
- 315.0 cm10 ft 4 in
- Mattress-only physical length
- 203.2 cm6 ft 8 inMattress-only footprint; frame not measured.
- Recommended clear room length
- 264.2 cm8 ft 8 in
Assumptions for us king mattress
- Portrait layout: bed width runs across the room and the headboard is against a wall.
- No outer frame was sourced for this market example; this is mattress-only geometry.
- Apply the recommendation to each accessible side; actual access needs vary. Editorial comfort guidance, not a regulation.
- FitWise modeling assumption: 24 inches at the foot. Sleep Foundation discusses space around each side; applying that figure at the foot is an extrapolation, not direct source guidance or a code minimum. The geometry engine treats the headboard as against a wall.
UK Standard King mattress
- Market
- UK
- Mattress width
- 150.0 cm4 ft 11 in
- Mattress length
- 200.0 cm6 ft 7 in
- Mattress/frame physical width
- 166.0 cm5 ft 5 inUsing IKEA MALM Standard King frame.
- Recommended clear room width
- 287.9 cm9 ft 5 in
- Mattress/frame physical length
- 209.0 cm6 ft 10 inUsing IKEA MALM Standard King frame.
- Recommended clear room length
- 270.0 cm8 ft 10 in
Assumptions for uk standard king mattress
- Portrait layout: bed width runs across the room and the headboard is against a wall.
- Frame overhang is derived from the published dimensions of IKEA MALM Standard King frame; other frames differ.
- Apply the recommendation to each accessible side; actual access needs vary. Editorial comfort guidance, not a regulation.
- FitWise modeling assumption: 24 inches at the foot. Sleep Foundation discusses space around each side; applying that figure at the foot is an extrapolation, not direct source guidance or a code minimum. The geometry engine treats the headboard as against a wall.
Sources and evidence
- Fitwise internal reference-size and clearance convention Fitwise.stream; accessed 2026-10-06
Internally documented round-number reference sizes and comfort-clearance recommendations used when no single external standard applies; see specs/DATA_MODEL.md §2.
- MALM bed frame, Standard King, weight and measurements IKEA UK; accessed 2026-10-06
Product listing states mattress width 150 cm and length 200 cm, with bed-frame outer width 166 cm and length 209 cm. Frame allowances in the model are derived by halving the outer-minus-mattress difference on each axis.
- Mattress Sizes 101: Finding Your Perfect Fit — Bedroom Dimensions Sleep Foundation; accessed 2026-10-06
Editorial recommendation to leave about 24 inches of space around each side of a bed to avoid a cramped feeling. This is guidance, not a building code or accessibility requirement.
- Mattress Sizes 101: Finding Your Perfect Fit Sleep Foundation; accessed 2026-10-06
Publishes US nominal mattress dimensions in inches. US King 76×80, Queen 60×80, Full 54×75. Values converted to millimetres; "Full" is used as the US-market term rather than treating Double as a universal name.