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Mattress Sizes Guide


The size of a twin mattress is nominally 39 inches x 75 inches but will sometimes be as much as 1-2 inches smaller in each dimension. Twin size is a good choice for a child or one not too tall adult. We’ll custom make your next mattress any size you want.


Recommended minimum room dimensions for each mattress size

There are many factors that will determine the size of bed you can fit into a bedroom such as:

  • door locations that could make much of your wall space unusable.
  • window locations that can interfere with furniture or cause drafts.
  • uneven ceiling heights that can reduce your usable square footage.
  • placement of electrical, cable, HVAC vents and phone outlets.
  • additional furniture that you may wish to place in the room including, night stands, chests, desks and dressers.
  • Keep in mind that if you’re adding a headboard or complete bed to your new mattress set (and not just a steel support frame) this will add to the overall dimensions shown in this guide by two to ten inches.
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Recommended steel bed frames for each mattress size
  • Steel bed frames needed to support each size of mattress set to properly maintain your warranty:
  • It’s important to read the fine print of your mattress set warranty in order to purchase the correct frame, particularly so if you’re supporting a queen size set that requires the extra centre support
  • Steel frames come in two styles. One with the shown wheels and a second with glide-cones (not shown but recommended for hardwood).
Twin or Double
Double or Queen
King
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Commonly available box spring & foundation sizes
  • Very few manufacturers make foundations with springs inside any more as costs have risen and there was little evidence that it increased the comfort or life span of the mattress above it. There are still some foundations that feature a very stiff wire grid just under the box spring’s top cover while others are manufactured with wood side supports and a solid wooden platform right underneath that same top cover.
dimensions of a twin size mattress
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Box Spring Sizes Chart
  • Above are the most popular box spring foundation heights but custom heights can be ordered as well

Custom Sized Mattresses

Learn how to price your custom size mattress Click here »


International Size Chart
Mattress Size Chart (width x length)
  Austrailia UK EUROPE
Twin / Single 36 x 75 in
91 x 191 cm
35 x 79 in
90 x 200 cm
Double / Full 54 x 75 in
137 x 191 cm
55 x 79 in
140 x 200 cm
Queen (UK King) 60 x 80 in
152 x 203 cm
60 x 78 in
152 x 198 cm
63 x 79 in
160 x 200 cm
King (UK Super King) 72 x 80 in
183 x 203 cm
72 x 78 in
183 x 198 cm
71 x 79 in
180 x 200 cm