Mattress Size and Fit
Choose the right mattress size, split setup, RV size, bed dimensions, and room fit.
Standard mattress sizes
Compare the standard U.S. dimensions first. Individual product pages confirm current availability and any nonstandard sizing.
| Size | Width | Length |
|---|---|---|
| Twin | 38 inches | 75 inches |
| Twin XL | 38 inches | 80 inches |
| Full | 54 inches | 75 inches |
| Full XL | 54 inches | 80 inches |
| Queen | 60 inches | 80 inches |
| King | 76 inches | 80 inches |
| California King | 72 inches | 84 inches |
Mattress size buying guides
Choose a size-specific shortlist after comparing length, width, room fit, and current availability.
01
Best Twin Mattresses
Six Twin mattresses for children, bunks, teens, guest rooms, and adults, with height and length matched to the actual bed. → 02Best Twin XL Mattresses
Six Twin XL mattresses for tall solo sleepers, dorm rooms, adjustable bases, and permanent narrow beds. → 03Best Full Mattresses
Six Full mattresses for solo adults, teens, guest rooms, daybeds, and compact bedrooms. → 04Best Full XL Mattresses
Three reviewed Full XL mattresses for tall solo sleepers who want Full width and Queen length. → 05Best Queen Mattresses
Six Queen mattresses that balance couple space, room fit, edge stability, motion control, cooling, and value. → 06Best King Mattresses
Six King mattresses for couples who need usable width, motion control, cooling, strong edges, and dependable support. → 07The Best California King Mattresses
California King mattresses for taller sleepers and couples who value length over the extra width of a standard King. → 08The Best Split King Mattresses
Split King mattresses with verified two-piece availability, strong independent-half support, and practical adjustable-bed tradeoffs. → 09The Best RV Mattresses
RV mattresses with verified compact-size availability, exact platform warnings, and options from 8 to 12 inches tall. → 10Best Mattresses for Tall Sleepers
Verified 80-, 84- and 108-inch mattress routes for tall solo sleepers and couples. →Start here
Common size comparisons
01
Twin vs. Twin XL Mattresses
Compare Twin and Twin XL length, sleeper and room fit, frames, bedding, dorm and bunk requirements, adjustable bases, and split-king compatibility. → 02Full vs. Full XL Mattresses
Compare Full and Full XL by actual dimensions, sleeper fit, room space, compatible products, availability, delivery, returns, and bunk-bed safety. → 03Queen vs. King Beds
Compare queen and king beds by exact dimensions, usable width, room footprint, access, compatibility, support, total cost, and return terms. → 04Queen vs. Olympic Queen Mattresses
Compare queen and Olympic queen dimensions, then verify the exact mattress, room, route, base, bedding, replacement options, and return terms before buying the speci... → 05King vs. California King Mattresses
Compare standard king and California king dimensions, room fit, bedding, bases, split options, and total cost before choosing. →Specialty sizes and setups
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