The Ultimate Mattress Size Guide

Standard Mattress Dimensions

Before diving into who each size is for, let's establish the standard dimensions you'll find in the United States.

Twin (38" x 75")

The standard twin mattress size is the smallest size to choose. A Twin is the go-to choice for children's rooms, bunk beds, and daybeds. It's perfect for a single sleeper and is an excellent space-saver in smaller rooms.

• Best For: Children, single adults under 6 feet tall, small guest rooms.

Twin XL (38" x 80")

The Twin XL mattress offers the same width as a standard Twin but adds 5 inches of length. This makes it the standard size for college dorm rooms, as it can comfortably accommodate taller teenagers and young adults. Two Twin XL mattresses can also be pushed together to form a Split King.

• Best For: Tall teenagers, college students, single adults with limited space.

Full / Double (54" x 75")

A Full size mattress provides significantly more width than a Twin, making it a great step up for growing teenagers or a comfortable choice for a single adult who likes more room to spread out. While it can technically fit two adults, it only leaves each person with 27 inches of space—the same width as a crib mattress—so it's not ideal for couples.

• Best For: Single active sleepers, young adults, guest rooms.

Queen (60" x 80")

The most popular mattress size in the country. The queen mattress offers a comfortable amount of space for both single sleepers and couples. It provides enough personal space for two adults without requiring the massive bedroom footprint of a King. It's the perfect balance of comfort and practicality for most master bedrooms.

• Best For: Couples, single adults who want extra space, most master bedrooms.

King (76" x 80")

A standard king mattress is the widest of all the standard sizes, offering a luxurious amount of space. It's the same length as a Queen but 16 inches wider, giving each person the equivalent of their own Twin XL mattress. This is the perfect choice for couples who value their personal space or for families who enjoy weekend morning snuggles with kids or pets.

• Split King: A King mattress is also available as a "Split King," which is two Twin XL mattresses placed side-by-side. This is ideal for couples with different firmness preferences or for those using an adjustable base. Your search for a puffy split king shows this is a popular, modern option.
• Best For: Couples who want maximum personal space, families, large master bedrooms.

California King (72" x 84")

The California King mattress trades width for length. It's 4 inches narrower than a standard King but also 4 inches longer, making it the longest standard mattress size available. It's the perfect solution for very tall individuals who need extra legroom to avoid having their feet hang off the end of the bed.

• Best For: Individuals over 6'2" tall, couples who prioritize length over width, long and narrow bedrooms.

How to Choose the Right Size Mattress in Kansas City

Consider these three factors before making your final decision:

1. Your Room Size: Measure your bedroom. A good rule of thumb is to have at least 2 feet of walking space around the three sides of your bed.

2. Who Will Be Sleeping on It: Are you a single sleeper? A couple? Do your kids or pets often join you? Be realistic about how much space you truly need.

3. Your Height and Sleep Style: If you are tall, a Queen, King, or California King is essential. If you are an active sleeper who tosses and turns, a wider mattress like a Full or Queen is a better choice than a Twin.