Customers are often confused about the different mattress sizes available. Here is a quick reference guide to determine the size you have now and if you could upgrade to a bigger size set. A mattress that is too small can be uncomfortable to sleep on night after night.
Please note that these sizes are industry standards. Sizes are approximate and might vary +/- 1/2 inch.
Twin – 38 x 74.5 Most commonly used in children’s beds and bunk beds.
Twin Extra Long – 38 x 79.5 Any twin adjustable would use a twin extra long mattress. This size is most common in college dorms.
Full (also called Double) 53 x 74.5
Queen 60 x 79.5
King 76 x 79.5 A king set is always two twin extra long foundations. The top mattress can be one standard king mattress or two twin extra long mattresses.
California King 72 x 83.5
Hope this helps you with making your next mattress purchase a comfortable one!