What bed size fits your room? Drag the bed and see

Bed sizes are sold by the mattress, but you live with the gaps around it. Pick a size, enter your room's measurements and drag the bed sideways to see how much walking space is left on each side and at the foot.

You get the rule of thumb (about 60 cm on each side, 75 cm if comfortable), when it is fine to break it, and what to measure before you buy a frame.