Choosing the right bed size makes a difference to both comfort and usable bedroom space. Standard UK mattress dimensions are a useful starting point, but upholstered frames and headboards may be larger.
Standard UK bed dimensions
Single: 90 × 190cm. Small double: 120 × 190cm. Double: 135 × 190cm. King: 150 × 200cm. Super king: 180 × 200cm. Always confirm the exact product measurements before ordering.
Single and small double beds
Singles work well for children, guest rooms and one adult in a compact room. Small doubles give a solo sleeper more width without requiring the space of a standard double. Two adults may find a small double restrictive for regular use.
Double and king-size beds
A standard double is a common choice for couples and offers a balance of sleeping space and room footprint. A king provides an extra 15cm of width and 10cm of length, which may help taller sleepers or couples wanting more space.
Super king beds
A super king gives couples generous width but needs more floor space. Check delivery routes, staircases and whether the room still allows comfortable access to wardrobes and doors.
Measure the whole bedroom
Mark the intended bed footprint on the floor. Allow for bedside tables, wardrobe openings and walking routes. If you choose a storage divan, account for drawer clearance; if you choose an ottoman, check access to its lifting platform.
Frequently asked questions
How big is a UK double?
135 × 190cm is the standard UK double mattress size.
Is a king longer than a double?
Yes. A UK king is 200cm long; a standard double is 190cm.
Can a king mattress fit a double base?
No. The dimensions are different.
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