Quick answer: twin XL mattresses are 6 inches longer than standard twin beds (80″ vs 74″), making them ideal for taller sleepers over 6 feet or college dorms. Both are 38″ wide—perfect for single sleepers in compact spaces. Choose twin for kids under 6 feet tall or budget priority. Choose twin XL for teens, adults, or anyone needing extra legroom.
Powered by Amerisleep, EarlyBird brings together a dedicated team of sleep science coaches, engineers, and product evaluators. We meticulously examine Amerisleep's family of products using our unique product methodology in Amerisleep's state-of-the-art laboratory. Our commitment to sustainability is reflected in our use of eco-friendly foam in our products. Each article we publish is accurate, supported by credible sources, and regularly updated to incorporate the latest scientific literature and expert insights. Trust our top mattress selections, for your personal sleep needs.
Key Takeaways
- Size comparison: Twin (38×74″) vs twin XL (38×80″)—same width, 6″ length difference
- Best for Twin: Children under 6 feet, bunk beds, guest rooms, tightest budgets ($649-$1,649)
- Best for Twin XL: Teens/adults over 6 feet, college dorms, adjustable bed bases ($699-$1,999)
- Room requirements: Both need minimum 7×10 foot bedrooms for furniture and walking space
- Bedding compatibility: Twin sheets won’t fit twin XL—always buy size-specific bedding
- Two Twin XLs = one King: Split king setup option for couples with different comfort needs
- Quick links: See our mattress size comparison. Compare twin XL vs full size.
In looking for the best mattress, before deciding between a memory foam and innerspring mattress, first decide on the right size. The best mattress will fit the bedroom while leaving extra space for furniture and room to walk.
Save $500 On Any Mattress
Plus free shipping
For single sleepers, a twin or twin XL mattress could be the best option—their small size fits any bedroom and could be an excellent choice for studio bedroom apartments.
In our article, we go over the differences between a twin and twin XL mattress, including the pros and cons of each mattress size.
What’s a Twin Size Mattress?
A twin size mattress, also known as a single bed, measures 38 inches by 74 inches. The twin size mattress is the smallest, compact standard size available on the market today. Twin size beds are perfect for children’s rooms—for families with more than one child, parents may find bunk beds a great option, leaving extra space for playing.
Twin or single size beds are also good options for guest beds and adults with limited living spaces, like studio apartments.
Pricing
Pricing for a twin size mattress ranges between $100 to $1500. High-end mattress options cost more because they include exclusive sleep technologies and organic materials.
Below, we offer a breakdown of our Amerisleep mattresses in twin size.
| Mattress | Price |
|---|---|
| Amerisleep AS1 | $649 |
| Amerisleep AS2 | $849 |
| Amerisleep AS3 | $1049 |
| Amerisleep AS3 Hybrid | $1249 |
| Amerisleep AS4 | $1049 |
| Amerisleep AS5 | $1649 |
| Amerisleep AS5 Hybrid | $1949 |
| Amerisleep Organica | $1049 |
Recommended Room Space
The best bedroom space for a twin size mattress should be at least 7 feet by 10 feet to accommodate space for furniture and room to walk. An evenly-spaced bedroom may also improve sleep in reducing stress from cramped quarters.
Pros
- Most affordable standard mattress size
- Perfect for children’s rooms—fits easily with other furniture
- Bunk bed compatible (most bunk beds designed for twin)
- Easiest size to move and transport
Cons
- Too short for anyone over 6 feet tall (feet hang off edge)
- Not suitable for two sleepers (only 19″ per person)
- Limited lifespan as kids grow—may need replacement by teen years
- Less cushioning area for active sleepers who move around
What’s a Twin XL Size Mattress?
A twin XL mattress is 38 inches by 80 inches—about the same size as a twin bed, but 6 inches longer. The extra length makes it a great choice both for children and adults who are taller, giving them more legroom.
Twin XL beds are also good options for guest rooms and studio apartments, and commonly found in college dorm rooms.
Pricing
Twin XL mattresses range between $300 to over $2000 for high-end models. These luxury beds cost more because they may include more layers and unique sleep technologies not widely available.
Below, we offer a breakdown of our Amerisleep mattresses in twin XL size.
| Mattress | Price |
|---|---|
| Amerisleep AS1 | $699 |
| Amerisleep AS2 | $899 |
| Amerisleep AS3 | $1099 |
| Amerisleep AS3 Hybrid | $1299 |
| Amerisleep AS4 | $1099 |
| Amerisleep AS5 | $1699 |
| Amerisleep AS5 Hybrid | $1999 |
| Amerisleep Organica | $1099 |
Recommended Room Space
The best area for a twin XL mattress is bedrooms 7 feet by 10 feet, enabling room for furniture and walking space.
Pros
- Extra 6 inches accommodates sleepers up to 6’6″ comfortably
- Standard college dorm size—sheets readily available on campus
- Two Twin XLs = King size (perfect for split King adjustable bases)
- Grows with teenagers—usable into adulthood
Cons
- Slightly higher cost than standard Twin ($50-$350 more)
- Still too narrow for two people (38″ width)
- Requires XL-specific bedding (standard Twin sheets too short)
- May be unnecessarily long for children under 5 feet
What About Twin and Twin XL Bedding?
Twin and Twin XL bedding is NOT interchangeable.
Twin Size Bedding:
- Fitted sheet: 38″ × 74″ (may fit mattresses 7-14″ thick)
- Flat sheet: 66″ × 96″
- Comforter: 64″ × 86″ to 68″ × 90″
Twin XL Size Bedding:
- Fitted sheet: 38″ × 80″ (may fit mattresses 7-14″ thick)
- Flat sheet: 66″ × 102″
- Comforter: 68″ × 90″ to 68″ × 96″
Shopping tip: Always check the label for “XL” designation. Generic “Twin” bedding will be too short for Twin XL mattresses. College students can often find Twin XL bedding bundles specifically marketed for dorm rooms during back-to-school season.
Other Mattress Sizes
If a twin or twin XL mattress feels too small, different mattress sizes, including full, queen, king, and California king, might be better options, especially for master bedrooms.
Full Size
Full size mattresses measure 54 inches by 75 inches, giving more space, both in width and length, to stretch out. Full size beds are excellent options for both teenagers and college students. They’re also suitable for single adults on their own with a tight budget and limited living space.
Queen Size
Queen mattresses are 60 inches by 80 inches, and one of the most popular mattress options for single adults. Queen beds give lots of room to stretch out and are great options for restless, or combination sleepers. Queen size mattresses are also good options for couples, though not as spacious as a king size.
King Size
King size mattresses measure 76 inches by 80 inches and are the largest standard mattress size available. King beds are perfect for couples, leaving room for personal space.
King beds also have the same dimensions as two twin XL mattresses placed side by side. This design choice is known as a split king mattress and is available for couples who prefer a mattress catered to their personal needs.
See also twin XL vs split king mattresses.
California King Size
A California king size mattress has the same area as a king bed, except a Cal king mattress is longer, measuring 72 inches by 84 inches. California king beds are another excellent option for couples, particularly those who like to sleep close together. Though not as widely available as a split king, split California king options are available to accommodate personal preferences.
Is a Twin or Twin XL Mattress Right for You?
| Twin | Twin XL |
|---|---|
| 38 inches wide | 38 inches wide |
| 74 inches long | 80 inches long |
When comparing the length and width of a twin and a twin XL bed, the primary difference is their lengths since both twin and twin XL size mattresses are 38 inches wide. Twin mattresses are 74 inches long, while twin XLs are 80 inches. While the 6-inch difference might not feel drastic, the extra legroom makes excellent mattresses for taller sleepers.
Choose Twin XL if you:
- Are over 6 feet tall or still growing (teens typically grow into this size)
- Need a college dorm mattress (Most universities use Twin XL as standard)
- Want to use an adjustable bed base (two Twin XLs create split King for couples)
- Plan to keep the mattress 7+ years as a teen grows into adulthood
- Have tall guests who visit regularly
Choose standard Twin if you:
- Are furnishing a child’s room for kids under 12 years old
- Need bunk bed mattresses (most bunk beds accommodate standard Twin)
- Have strict budget constraints (Twin saves $50-$350 per mattress)
- Are buying multiple mattresses for guest rooms (lower total cost)
- Have a sleeper under 5’10” who won’t need the extra length
Quick decision guide: If there’s any question about height, choose Twin XL. The extra 6 inches provides years of additional use and the cost difference is minimal compared to replacing a too-short mattress.
Next Steps Checklist:
- Measure your sleeper: If over 6 feet tall, choose Twin XL. If under 6 feet, standard twin works.
- Check your room dimensions: Ensure at least 7×10 feet of space for either size.
- Verify bed frame compatibility: Confirm frame matches exact mattress size (Twin frames won’t fit Twin XL).
- Budget for bedding: Twin XL requires XL-specific sheets, protectors, and comforters.
- Consider growth: For teenagers, Twin XL provides 4-6 more years of use before needing upgrade.
- Confirm dorm requirements: If buying for college, verify school uses twin XL (most do, but confirm).
Ready to choose your perfect size? Still deciding? Use our mattress size comparison chart to see how twin and twin XL stack up against full, queen, and king options.
FAQs
How wide is a twin bed?
Twin and twin XL mattresses are each 38 inches wide. What makes a twin XL an “XL” size is its extra length, it measures 80 inches long. (So how long is a twin bed? Twins are only 74 inches long.)
Can a twin fitted sheet fit on a twin XL?
Because a twin XL mattress has five extra inches in length, regular twin sheet sets may not fit a twin XL bed—the sheets may come up short.
Do two twin beds make a California king?
No, two twin mattresses don’t make a California king size mattress. A twin size bed is 38 inches by 80 inches, while a California king bed is 72 inches by 84 inches. Two twin XL mattresses do make a king size, though.
How much bigger is a full than a twin XL?
A twin XL mattress may have five extra inches in length compared to a standard twin, but a full has 16 inches of extra width. Full size beds might be better options for single sleepers who toss and turn at night.
Why do colleges use twin XL mattresses?
Dormitories have to accommodate all heights of college students, and also need a mattress that’s compact enough to allow other living essentials in a small space. The twin XL mattress was the chosen solution and became the standard for college dorms.
Will twin XL fit on twin frame?
No. Even if you have no footboard that prevents you from physically putting the mattress on a too-small bed frame, letting the excess 5 inches hang off the end of the bed will put unnecessary strain on the mattress and lead to premature sagging.
Is twin XL enough for 2 people?
No, it is not. The extra 5 inches only ensure more footroom for one sleeper. Two people trying to share a twin or twin XL would have about 19 inches of sleeping space, making it likely for one person to roll off the bed in the night.
Is a Twin or Twin XL Mattress Right for You?
Twin and twin XL mattresses are great options for kids, teenagers, and single adults. They’re the perfect length and width to accommodate any room size, especially for children’s bedrooms and studio apartments.
About the author
Geoff McKinnen is a writer focusing mainly on the healthcare industry and has written articles on everything from foods to help you lose weight to the connection between Alzheimer’s and sleep. Geoff’s passionate about helping readers improve their well-being to lead happier lives. Outside of work, Geoff enjoys cycling and hiking and believes that by leading a healthy lifestyle, he can help others do the same.
View all posts
