38" x 75"
39' 75'
its called a twin mattress and their are several sized their are longer types and one that are just a tiny bit wider
Twin 38" x 75" Full/Double/Regular 53" x 75" Queen 60' x 80" King 76" x 80" Cal. King 72" x 84"
In the mattress industry, the standard size for a Queen mattress is 60 x 80 inches (or 153 x 203 cm).