MnM Mattress Guide
UK Mattress Size Guide
Everything you need to choose the right mattress size for your bedroom
UK Mattress Sizes
Mattress Size Chart
Standard UK mattress sizes with exact dimensions in cm and feet. Bed frames are slightly larger than the mattress — always check external frame dimensions if space is tight.
Single
- Mattress cm
- 90 × 190
- Best for
- One sleeper, children, guest rooms
Small Double
- Mattress cm
- 120 × 190
- Best for
- Solo sleeper wanting extra width
Double
- Mattress cm
- 135 × 190
- Best for
- Couples or generous solo sleepers
King
- Mattress cm
- 150 × 200
- Best for
- Couples wanting more width and length
Super King
- Mattress cm
- 180 × 200
- Best for
- Maximum space, couples and families
| UK Size | Mattress cm | Best for |
|---|---|---|
| Single | 90 × 190 | One sleeper, children, guest rooms |
| Small Double | 120 × 190 | Solo sleeper wanting extra width |
| Double | 135 × 190 | Couples or generous solo sleepers |
| King | 150 × 200 | Couples wanting more width and length |
| Super King | 180 × 200 | Maximum space, couples and families |
Each size explained
Which mattress size is right for you?
Single
90 × 190 cmThe standard single is the most compact option, ideal for one person. It suits children's rooms, spare rooms, or any space where square footage matters.
- One sleeper, children or teenagers
- Guest rooms and compact bedrooms
Small Double
120 × 190 cmThe small double is 30cm wider than a single, giving a solo sleeper noticeably more room to move. It fits bedrooms where a full double won't sit comfortably.
- Solo adult wanting more room to move
- Rooms too tight for a full double
Double
135 × 190 cmThe double is the most common UK choice for couples in standard bedrooms. It also gives a solo sleeper generous room to spread out without dominating a smaller space.
- Couples in standard UK bedrooms
- Solo sleepers who prefer extra room
King
150 × 200 cmKing is the most popular upgrade from a double — 15cm wider and 10cm longer. It makes a meaningful difference for couples and suits most spacious master bedrooms.
- Couples wanting more comfort and length
- Taller sleepers who need the extra length
Super King
180 × 200 cmThe super king delivers 30cm more width than a king and is the largest standard UK mattress size. It suits large master bedrooms where space is not a constraint.
- Couples wanting maximum personal space
- Large master bedrooms with room to spare
Bed size vs mattress size, what is the difference?
Mattress size is the sleeping surface measurement.
Bed frame size is the external footprint of the bed.
Why it matters:
- A mattress must match the frame's internal size.
- The frame footprint determines whether it fits your room.
- Headboards, footboards, and thick side rails can add meaningful extra centimetres.
Room planning
How much space do you need around the bed?
A bed can fit on paper but still feel cramped if you can't walk around it comfortably.
Side clearance
60cm on each side you use for getting in and out of bed
Foot clearance
60–75cm at the foot of the bed if you walk past it often
Storage clearance
Extra space where drawers open or an ottoman base lifts
Bedding
What bedding fits each mattress size?
Fitted sheets must match both the mattress size and depth.
Duvet sizes
| Size | Dimensions |
|---|---|
| Single | 135 × 200 cm |
| Double | 200 × 200 cm |
| King | 230 × 220 cm |
| Super King | 260 × 220 cm |
Fitted sheets
Measure your mattress depth from top to bottom. If you're using a mattress topper, include it in the measurement. Buy fitted sheets with a depth range that matches your total height — most standard sheets fit mattresses up to 30cm deep, but deep-fill options go to 40cm or more.
Common questions
Frequently asked questions
Ready to choose your mattress?
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