Mattress Firmness Guide

Mattress Size Guide

Mattresses aren’t one size fits all. There are multiple sizes ranging from crib to king designed to suit the needs of a variety of sleepers.

Choosing the right mattress size is essential, as it’s the first step in finding a mattress that suits you for a comfortable night’s sleep. Your height, weight, and if you share your bed with anyone (partner, pet, or child) influences the right mattress size choice for you.

In this guide, you will find information on every size of mattress available. This guide shares the dimensions of mattress sizes, who they are best for, and who they’re not so good for. Use the mattress size chart for quick reference, or read the guide to learn more about what each mattress size has to offer.

Mattress Size Chart/Guide

Mattress Size Dimensions Height/Weight Weight Number of Sleepers Best for Not good for
Twin 38” x 75” Short or average height Thin 1 Children, single adults, small living spaces Couples, tall adults
Twin XL 38”x80” Average or tall height Thin 1 Tall single adults, college students Couples
Full/Double 54” x 75” Short or average height Average to heavy weight, thin if sharing the bed 1-2 adults Single adults, children, small guest rooms Tall adults, couples who need more space or want to sleep with pets
Queen 60” x 80” Average or tall height Average to heavy weight, thin to average weight if sharing the bed 1-2 adults Single adults, couples Couples who need more space or want to sleep with pets
King 76” x 80” Average or tall height Average to heavy weight 1-2 adults Couples, especially with pets or kids sharing the bed People with small master bedrooms
California King 72” x 84” Average or tall height Average to heavy weight 1-2 adults Tall couples People with small master bedrooms
Crib 28” x 52” Short Small 1 baby Newborns, infants Older children, adults
Toddler 28” x 52” Short Small 1 toddler Toddlers Older children, adults

Twin

Dimensions: 38” x 75”
Best for: children, single adults, small living spaces
Not good for: couples, tall adults

Twin mattresses are most often used for children or small-sized adults. Appropriate for single sleepers, this is the smallest size of bed for adults. At 75 inches long, it may be too short for taller adults. And with just 38 inches in width, it can be too small for adults who aren’t thin.

Twin XL

Dimensions: 38” x 80”
Best for: tall single adults, college students, children
Not good for: Couples

Slightly larger than twin mattresses, twin XL mattresses offer more length for taller sleepers. Most often found in college dorms, the twin XL size mattress is good for children, young adults, and older adults who are tall and thin.

Full/Double

Dimensions: 54” x 75”
Best for: single adults, children, small guest rooms
Not good for: tall adults, couples who need more space or want to sleep with pets

Full mattresses, also known as double mattresses, are good for children and single adults. While they can sleep two adults, they do not offer much personal space if you’re sharing your bed with another adult or a large pet. At 75” long, taller adults may feel cramped in this size bed. This bed can be a good choice for larger adults sleeping alone.

Queen

Dimensions: 60” x 80”
Best for: single adults, couples
Not good for: couples who need more space or want to sleep with pets

Queen mattresses are a good size for two adults, or single adults who want more space. They are long enough for taller adults and wide enough to accommodate two people. But if both adults need more space, or you want to sleep with a pet and your partner, a queen may be too small. Queen beds are another good choice for larger adults sleeping alone, but they are typically too small for two large adults.

King

Dimensions: 76” x 80”
Best for: couples, especially with pets or kids sharing the bed
Not good for: people with small bedrooms

King mattresses are the largest size of mattress available. They are good for couples, especially those who want to sleep with pets or children or who need more space to spread out. At 80 inches long, they offer enough space for tall adults. They are also wide enough to accommodate two large adults. However, they can be too large to fit some rooms.

California King

Dimensions: 72” x 84”
Best for: tall couples
Not good for: people with small bedrooms

Similar to the king, California king mattresses lose four inches in width, but gain four inches in height. They are a good choice for couples that include at least one tall person. The width is still large enough to accommodate two adults. But like the regular king mattress, they do take up a lot of space and can be tough to fit into small bedrooms.

Crib Mattress

Dimensions: 28” x 52”
Best for: newborns and infants
Not good for: older children, adults

Crib mattresses are designed for babies. They offer a firm, safe surface for infant sleep. Much smaller than any adult-sized mattress, crib mattresses are sized to fit safely into cribs. They are a good choice for newborns and infants. Children who have reached 18 months of age, or who are more than three feet tall, should move into a larger mattress.

Toddler Mattress

Dimensions: 28” x 52”
Best for: toddlers
Not good for: older children, adults

The exact same size as crib mattresses, toddler mattresses are designed for toddlers who have moved out of their crib and into a traditional bed. These mattresses are slightly softer than crib mattresses. Still smaller than adult-sized mattresses, toddler mattresses are often only used for a short period of time. Many parents skip straight to a twin bed after moving children out of their crib.

Scale Rating Softness/Firmness Characteristics Sleeping Position Ideal Weight
1 Very soft Deep sinking and contouring Side Light (130 pounds or less)
2-3 Soft Moderate contouring and sinking Side Light to average sleepers (less than 130 to 230 pounds)
4-6 Medium to Medium-firm Balanced firmness, support, and comformability Side, back, and stomach Average to heavy (130 to 230 oounds or more)
7-9 Firm Higher levels of firmness and support with less conformability Back Heavy (230 pounds or more)
10 Very firm Extremely hard, little to no conformability Back Heavy (230 pounds or more)

Other Considerations for Mattress Firmness

Don’t confuse firmness with support. Firmness and support aren’t the same thing. Support is how well a mattress relieves pressure and keeps your spine in alignment regardless of how soft or firm a mattress is, while firmness is how hard a mattress feels when you lie down on it.

Be very careful with soft mattresses. Most people that believe they like sleeping on a cloud really don’t. Though soft mattresses will offer the best conforming abilities, they are not comfortable for all sleepers. People of average to heavy weight will typically sink too deeply into a soft mattress to feel comfortable and well supported.

Medium firmness is best for most sleepers. Even though one size doesn’t always fit all, medium firmness (ranging from 6 to 7) is the best firmness level for most people (about 80 percent of sleepers).