Bed sizes comparison:
A graphic comparing the sizes of standard bed sizes

The graphic at left illustrates the relation of the four common standard bed sizes in the US and Canada.

Twin size plans 39"x75" 86cm x 190cm
Double size plans  54"x75"  137cm x 190 cm 
Queen size plans 60"x80" 152cm x 203cm 
King size plans 76"x80" 193cm x 203cm 

If you are 5'9" or taller, the extra length of the queen and king bed sizes gives you more room to stretch out. If you are 5'6" or shorter, the extra length doesn't make much difference.

A king size mattress is almost the width to two twin size mattresses side by side.

There is only 6" of width difference between double and queen size beds, but the 6" make a big difference. 54" for two people is just a little bit too narrow. Having a bed frame with rails that come up to almost the level of the mattress also helps, because there is less risk of just rolling off the squishy edge of the mattress as you get near the edge. It does however make changing the sheets more difficult.

More on bed plans for different sizes on my Woodworking website



Building a bed from
2x4 lumber, and plans
Building storage shelves
and plans