📏 Mattress Size Calculator
Pick a mattress size to see its dimensions in inches and centimetres, its surface area, how many sleepers it suits, and the minimum room size it fits comfortably.
📏 Compare Standard Mattress Sizes
What is a Mattress Size Calculator?
A mattress size calculator is a quick reference for the standard US bed sizes. For any size from Twin to California King it returns the width and length in both inches and centimetres, the surface area in square feet, and how many people it comfortably sleeps.
It also suggests a minimum room size so you can be sure the bed leaves space to walk and open drawers before you buy. Dimensions are standards; actual products vary slightly, and mattress depth depends on the model.
❓ Frequently Asked Questions
What are the standard US mattress sizes?
The common sizes are Twin (38×75 in), Twin XL (38×80 in), Full or Double (54×75 in), Queen (60×80 in), King (76×80 in), and California King (72×84 in). Queen is the most popular for couples, while California King trades a little width for extra length, which suits taller sleepers.
What size mattress is best for couples?
A Queen at 60 inches wide is the most common choice and fits most bedrooms, giving each person about 30 inches — roughly the width of a crib. Couples who want more personal space, share with kids or pets, or are tall often prefer a King (76 in wide) or California King (longer but narrower), provided the room can take it.
How much room do I need around a mattress?
Leave about 24 to 30 inches of walking space on the sides and foot of the bed you use, so doors and drawers open freely. The minimum room sizes shown are comfortable starting points: a Full or Queen suits a 10×10 ft room, while a King or California King is happier in 12×12 ft or larger.