Dimensions / Furniture / Mattresses / King
A US king mattress is 76 × 80 in (193 × 203 cm), as wide as two twins side by side. A California king is narrower and longer at 72 × 84 in (183 × 213 cm), and a UK king is far smaller, 150 × 200 cm.
| Width | Length | California king |
|---|---|---|
| 193cm76 in | 203cm80 in | 183 × 213cm72 × 84 in |
Sources: Sleep Foundation. Checked October 2026.
Enter your room and the nightstands. A king takes the most wall of any standard size, so the second check is the one to watch.
All in centimetres. 1 in = 2.54 cm.
It leaves 83.5 cm at each side and 97 cm at the foot, and 61 cm is enough to walk.
Measured from the mattress; frames, especially upholstered ones, are bigger.
The bed and two 66 cm nightstands, 8 cm from it, take 341 cm of your 360 cm wall.
Nightstands of 66 cm (26 in) or more suit a king.
At 203 cm this is one of the long sizes, the kind suggested for sleepers over 183 cm (6 ft).
A king is a long size; a California king adds 10 cm (4 in) more length.
Choosing between king and California king? Photograph the room, mark both walls in SizeMarker and compare the two footprints.
Mark a photoWidth × length. The same name means a different size in the US, UK and EU.
| Size | Width | Length |
|---|---|---|
| King (US)This page | 193 cm76 in | 203 cm80 in |
| California King (US)10 cm (4 in) narrower, 10 cm longer | 183 cm72 in | 213 cm84 in |
| Two twin XLs side by sideSame footprint as a king | 193 cm2 × 38 in | 203 cm80 in |
| Queen (US) | 152 cm60 in | 203 cm80 in |
| UK emperorThe largest UK size | 200 cm6 ft 6 in | 200 cm6 ft 6 in |
| UK super king | 180 cm6 ft | 200 cm6 ft 6 in |
| UK kingMuch smaller than a US king | 150 cm5 ft | 200 cm6 ft 6 in |
| EU super king | 180 cm | 200 cm |
| EU king | 160 cm | 200 cm |
Sources: Sleep Foundation · Dreams
A king needs the most floor and the widest wall of the standard sizes.
| Measurement | Size |
|---|---|
| Width each, two sleepers193 ÷ 2, the width of a twin | 97 cm38 in |
| Space at the foot and each side | 61 cm24 in |
| Nightstand width for a king | 66 cm or more26 in or more |
| Gap between bed and nightstand | 8 cm3 in |
| Wall for a king and two 66 cm nightstands193 + 2 × (8 + 66) | 341 cm134 in |
| Floor with 61 cm at both sides and the foot(193 + 122) × (203 + 61) | 315 × 264 cm124 × 104 in |
Sources: Sleep Foundation (queen) · Tidbits & Twine
76 × 80 in (193 × 203 cm) in the US, as wide as two twin mattresses side by side. Two twin XLs together have exactly the same footprint.
Neither by much. A California king is 72 × 84 in (183 × 213 cm): 10 cm (4 in) narrower and 10 cm longer than a 76 × 80 in king, which is why it suits taller couples.
Couples who want space to spread out, or who share the bed with a child, according to Sleep Foundation. Each of two sleepers gets 97 cm (38 in), the width of a twin.
No. A UK king is 150 × 200 cm, closer to a US queen. The UK sizes nearest a US king are the super king, 180 × 200 cm, and the emperor, 200 × 200 cm.
Check before you order: Sleep Foundation advises making sure the bedroom door frame is wide and tall enough to get a mattress this size in. The room needs about 315 × 264 cm (124 × 104 in) with 61 cm (24 in) at both sides and the foot.
For a king, buyers ask whether it is a US king, a California king or a UK king, and whether it comes as one mattress or two twin XLs. Mark the real size on your own photo in SizeMarker, as in the picture at the top, and send one product card for WhatsApp or WeChat.
