If you’ve ever shopped for a bed, you might have come across both “full” and “double” mattresses. So, what’s the difference?
The answer is simpler than you think—full beds and double beds are the exact same thing.
Whether you call it a full or a double, you’re talking about the same size mattress with the same dimensions. But why the two names? Let’s break it down so you can shop confidently, knowing exactly what you’re getting.
Full vs Double Mattresses (What’s The Difference?)
Full and double mattresses have no difference in size, shape, or structure. Both a full and a double mattress measure about 54 inches in width and 75 inches in length. In practical terms, that gives you a bed that’s 4.5 feet wide and just over 6 feet long.
So, why do we have two names for the same mattress? The answer is mostly historical.
The term "double" was commonly used in the past, especially in the early to mid-20th century. Back then, a double bed was considered luxurious for two people. However, over time, as mattress sizes like queen and king became more popular for couples, "full" became the more standard term. Today, “double” is still used occasionally, but “full” is far more common, especially in the U.S.
Why the Confusion?
In some places, particularly outside of the U.S., the term "double" is still widely used. In the U.S., "full" has become the go-to term, but both names describe the same mattress size.
If you see a mattress advertised as either a full or a double, you can be sure they are the same dimensions.
Quick Facts About Full/Double Mattress Dimensions:
- Width: 54 inches
- Length: 75 inches
- Height: Varies depending on the brand and mattress type (e.g., memory foam vs innerspring)
As you can see, the terms full and double refer to the same size, so there's no need to worry about any functional difference. If you see a mattress marketed as either, rest assured it’s the same standard size.
If you're deciding between a full/double and a queen mattress, check out this comparison of full/double vs queen mattresses to help make your decision.
Who Should Use a Full Size Mattress?
A full or double mattress is a versatile choice that works for many different sleepers. It provides a balance of space and comfort without taking up too much room in your bedroom. Here are some groups of people who might find a full-size mattress the perfect fit:
- Single Adults: If you sleep alone, a full-size mattress offers plenty of room to stretch out. It's wider than a twin, giving you extra space to move around, but not so large that it overwhelms your bedroom. Whether you like to sprawl out or prefer to stay curled up, a full bed gives you the flexibility to find your most comfortable position.
- Teenagers: As teens go through growth spurts, they’ll quickly outgrow a twin bed. A full mattress provides more space both in width and length, making it a great option for growing bodies. Plus, it offers enough room for them to study, relax, or hang out with friends, all while fitting comfortably in their bedroom.
- Guest Rooms: Full-size beds are a smart option for guest rooms. They offer more comfort than a twin for single guests, and can even accommodate two guests if necessary. A full bed provides a cozy but functional sleeping space without taking up too much of the room, leaving space for other furniture or luggage.
- Smaller Bedrooms: If you're working with limited space in your home, a full-size mattress can be a perfect solution. It strikes a balance between being more spacious than a twin but not as large as a queen. This makes it ideal for smaller bedrooms, apartments, or studio spaces where you want to maximize comfort without compromising your floor space.
- Young Couples: Though a full bed may be tight for two adults, it can be a suitable temporary solution for young couples just starting out or those living in a small apartment. It’s also a budget-friendly option, as full-size mattresses tend to be more affordable than queen or king sizes. While long-term use for two people might not be ideal, it’s certainly manageable in the short term.
- Special Considerations: For those looking for more flexibility, a full-size mattress is also compatible with adjustable bed bases. Learn more about whether adjustable beds are worth it for your lifestyle.
Can Two People Sleep on a Double (Full) Mattress?
While it’s possible for two people to share a full (or double) bed, it’s not always the most comfortable option. At 54 inches wide, that leaves each person with about 27 inches of sleeping space—roughly the width of a crib mattress. This can feel tight, especially if you and your partner move around a lot at night. However, some couples manage just fine on a full mattress, especially if:
- You like to cuddle: If you and your partner enjoy close sleeping quarters, a full mattress may work for you.
- You’re on a budget: Full mattresses are often more affordable than queen or king options, making them a good choice if you’re trying to save money.
- Your bedroom is small: If you don’t have room for a larger mattress, a full bed can save space while still offering room for two.
For many couples, though, upgrading to a queen might be the better option. If you’re curious about how full and queen mattresses compare, check out our article on full/double vs queen mattresses.
How is a Full/Double Different Than a Twin Mattress?
Dimensions:
- Twin mattress: 38 inches wide, 75 inches long
- Full mattress: 54 inches wide, 75 inches long
A full mattress is significantly wider than a twin, giving you much more room to spread out, which can make a big difference in comfort, especially for adults or growing teens. Let’s break down the main differences:
As you can see, the main distinction is in the width. A full mattress is 16 inches wider than a twin, which can feel like a lot more room if you’re an adult or a teenager who needs more space to sleep comfortably. This extra width allows you to move around more freely during the night, making it a better option for solo sleepers who might find a twin too narrow.
Length Considerations
Both twin and full mattresses are 75 inches long, or just over 6 feet. While this length works well for most people, it can be a bit short for those who are taller than 6 feet. In that case, you might want to consider a twin XL, which adds an extra 5 inches in length (38 x 80 inches), or a queen mattress, which is both longer and wider than a full.
When to Choose a Twin Mattress
- Children: A twin mattress is ideal for young kids who don’t need a lot of space and fit comfortably within the dimensions.
- Small rooms: If space is limited, a twin bed is a great option for fitting in tight areas, such as kids' bedrooms, guest rooms, or dorms.
- Bunk beds: Many bunk bed setups use twin mattresses due to their smaller footprint, making them a practical solution for shared rooms.
When to Choose a Full/Double Mattress
- Single adults: The added width provides more room to stretch out, making it a more comfortable choice for solo sleepers.
- Teenagers: As teens grow, they might find a twin bed too cramped. A full mattress offers more space without overwhelming their bedroom.
- Guest rooms: Full beds are a great middle-ground for guest rooms, offering comfort for adults without taking up as much space as a queen.
In short, if you’re looking for a mattress that can offer more comfort and room for movement but still fits in a relatively small space, a full mattress is the way to go. While both twin and full mattresses are great for certain situations, it’s important to choose based on who will be using the bed and how much space they need.
More Tips When Shopping for a Mattress
When choosing a mattress, size is just one factor to consider. You’ll also want to think about your comfort preferences, budget, and any specific needs you might have. Here are some additional tips to keep in mind while mattress shopping:
Select Your Mattress Type
Mattresses come in various types, and each offers a different sleep experience.
Memory foam mattresses are known for contouring to your body’s shape, providing pressure relief, and reducing motion transfer—ideal if you share a bed.
Innerspring mattresses, on the other hand, provide more bounce and support, making them great for those who prefer a firmer surface. There are also hybrid mattresses, which combine memory foam and innerspring coils to offer the best of both worlds. Make sure to test out different types to see which one gives you the best comfort and support.
Think About Firmness
Mattress firmness is a personal preference, but it can also be tied to your sleeping position. If you sleep on your side, you might prefer a softer mattress that cushions your hips and shoulders.
Back and stomach sleepers, however, often find that medium-firm to firm mattresses provide the best spinal support. You may want to visit a store to test firmness levels or look for mattresses with customizable firmness options.
Look for Adjustable Bed Compatibility
An adjustable bed base can make a significant difference in your sleep quality, especially if you have specific health concerns like snoring, back pain, or circulation issues.
Adjustable bases let you elevate your head or feet to find the most comfortable position for sleep. Before buying a mattress, check to ensure it's compatible with adjustable bed bases. Most modern mattresses, including memory foam and hybrids, are compatible.
Read more about whether adjustable beds are worth it to enhance your sleep comfort.
Check for Cooling Features
If you tend to sleep hot, you’ll want to look for mattresses with cooling technology. Memory foam can sometimes trap heat, but many newer models include gel infusions or breathable covers to help regulate temperature. Innerspring and hybrid mattresses usually offer better airflow, keeping you cooler at night.
Set a Budget
Mattresses come in a wide range of prices, so it’s important to set a budget before you start shopping. While it can be tempting to go for the cheapest option, investing in a good quality mattress can improve your sleep and last longer in the long run.
Prices can vary depending on the type, brand, and materials used. To find out more about pricing, check out our guide on how much a good mattress costs before you make a decision.
Final Thoughts
In the debate of full vs double beds, the answer is clear: they’re exactly the same. Whether you call it a full or double mattress, you’re getting a bed that’s perfect for single adults, teens, guest rooms, or smaller spaces.
While it can fit two people, you might find it a bit tight for long-term comfort. Keep in mind that your mattress is an investment in your health and well-being, so take the time to find the right one for you.
Ready to find your perfect mattress? Explore our wide selection of full-size mattresses and learn more about how to improve your sleep with an adjustable bed. Visit Ergomotion today and make your bedroom more comfortable than ever!