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The standard sizes for adult mattresses are twin, full, queen and king. A longer alternative to the standard king-size bed is the California king. Crib and toddler size mattresses are for use in children's beds.


There are nine mattress sizes available, according to the Better Sleep Council. In addition to the standard twin, twin extra-long, full, queen, king and California king mattress sizes, there are also special mattresses for futons, cribs and toddler beds.


A full mattress is 54 inches wide by 75 inches long. Depth varies based on the mattress. The original name for a full mattress was a double.


A twin mattress measures 38 inches wide by 75 inches long. A full mattress, sometimes called a double, is 53 inches wide and 75 inches long. A queen-sized mattress is 60 inches wide by roughly 80 inches long, or 6 inches wider and 5 inches longer than a full.


The standard size of a twin mattress is 39 inches by 75 inches, while a full mattress is 54 inches by 75 inches. A queen mattress is 60 inches by 80 inches. A king mattress, also called an eastern mattress, is 76 inches by 80 inches, according to Bedding Experts.


A double or full-size mattress is about 53 inches wide and 75 inches long. If two people share a double mattress, each individual has a space about 27 inches wide, which is about the same width as a crib mattress.


European mattresses come in the same standard sizes as American mattresses, but the dimensions for each type are slightly different. For instance, a European single mattress is normally 35 inches wide and 79 inches long, which is 4 inches narrower and 4 inches longer than an American single.


The best size of mattress for a couple depends on whether the couple needs a smaller bed for a small bedroom or a larger bed to sleep more comfortably, according to The Bedding Experts. The main options are the full-size, queen-size and king-size mattresses.


The smallest size of mattress intended for an adult is the twin size mattress. The smallest mattress manufactured is the crib size mattress, meant to be placed in a baby's crib.


A North American standard twin-sized mattress measures 39 inches wide by 75 inches long. A twin-XL mattress, which accommodates taller sleepers, measures 39 inches by 80 inches.