MATTRESS SIZE GUIDE
Choosing the right size mattress can make a significant difference in both sleep quality and bedroom layout. Our mattress size guide outlines standard mattress dimensions - from Twin to California King - and practical considerations to help you compare options and choose the best fit for your comfort and room.
CALIFORNIA KING MATTRESS
Ideal Room Size: At least 12' x 14' or larger
Best for: Taller individuals, couples, co-sleepers (a small child or pets)
At 84 inches long, a California King bed is the longest standard mattress size available. This length is designed for taller individuals who need a bit more legroom to stretch out compared to a King mattress. Measuring 72 inches wide, the Cal King mattress is 4 inches narrower than a King, making it an easier fit in some bedrooms with limited space. California King size mattresses are available in Split Top and Split versions for a more individualized sleep experience.
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KING MATTRESS
Ideal Room Size: At least 12' x 14' or larger
Best for: Couples, co-sleepers (a small child or pets)
A King bed, measuring 76 inches across, is the widest mattress size available, giving each sleeper about the same space as a Twin XL mattress. This added room helps minimize motion transfer and nighttime disruptions, making a King size mattress ideal for light sleepers or couples with different sleep schedules. Many King mattresses are available in Split Top versions, allowing for a more personalized sleep experience, as well as Split King versions (two separate Twin XL mattresses put together) which are ideal for maneuvering around corners and in tight spaces where a traditional King size mattress might not fit.
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QUEEN MATTRESS
Ideal Room Size: At least 10' x 10' or larger
Best for: Couples, single sleepers looking for extra space
A Queen bed is the most popular mattress size in America for a reason—it is a versatile option that works well for both single sleepers and couples. Queen size mattresses fit easily in most bedrooms and fit through most standard doorways. Given the versatility of a queen size mattress, this is the perfect size to transition with you through various stages of life.
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FULL MATTRESS
Ideal Room Size: At least 10' x 10' or larger
Best for: Single sleepers, smaller living spaces, guest bedrooms
Full size mattresses (also known as a double bed) are a middle-ground option between a Queen and Twin for a single sleeper. Measuring 54 inches wide, it is a perfect choice for someone wanting a bit more room than a Twin mattress or rooms with limited space. While two adults can share a Full bed, it’s best suited for one person.
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TWIN XL MATTRESS
Ideal Room Size: At least 8' x 10' or larger
Best for: College dorm rooms, couples looking for a Split King option
Offering the same length as a King mattress, the Twin XL bed is a great option for taller single sleepers. Twin X-Long mattresses are commonly found in college dorms or summer camp bunk beds, giving more sleep space while reducing the bed’s footprint in small areas. Twin XL mattresses are also used in Split King beds, with two mattresses placed side by side. Combined with an adjustable base, this offers couples a more personalized sleep experience.
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TWIN MATTRESS
Ideal Room Size: At least 7' x 9' or larger
Best for: Children’s bedrooms, bunk beds, and daybeds
Twin size mattresses, also known as single mattresses, offer an affordable space-saving solution for single sleepers. Most often used for children and teens, Twin mattresses are 75 inches long and 39 inches wide, making them perfect for bunk beds, daybeds, and kids’ shared bedrooms.
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Take the guesswork out of choosing the right mattress with
FIND YOUR PERFECT MATTRESS, BACKED BY SCIENCE.
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Choosing the right mattress size can have a big impact on how comfortably you sleep and how your bedroom functions day to day. The right size gives you enough room to stretch out, change positions, and settle in without feeling cramped—while still fitting your space, furniture layout, and lifestyle. Whether you’re upgrading to a queen mattress for everyday comfort or considering a king mattress for more space, selecting the right mattress dimensions helps you sleep better and wake up more refreshed.Find the Mattress Size that’s Best for You