A full size mattress — also called a double — measures 54 inches wide by 75 inches long. That's the short answer. But whether a full is the right choice depends on your height, how you sleep, who you share with, and how much bedroom space you're working with.
This guide covers everything you need to decide: exact dimensions, how a full compares to other sizes, who it suits best, and what to look for when buying one.
A standard full size mattress measures:
The full XL variant shares the same 54-inch width but extends to 80 inches in length — five extra inches for taller sleepers.
For room planning: a full mattress fits comfortably in a room that's at least 10 x 10 feet, leaving space for bedside tables and movement. A 10 x 12 foot room gives you a bit more breathing room.
| Size | Width | Length | Best For |
|---|---|---|---|
| Twin | 38" | 75" | Kids, bunk beds |
| Twin XL | 38" | 80" | Dorms, tall teenagers |
| Full | 54" | 75" | Single adults, guest rooms |
| Full XL | 54" | 80" | Single adults over 6' |
| Queen | 60" | 80" | Couples, most adults |
| King | 76" | 80" | Couples who want space |
| California King | 72" | 84" | Tall couples |
A full gives you 16 more inches of width than a twin — a significant upgrade for solo sleepers. Compared to a queen, you're giving up 6 inches of width and 5 inches of length.
A full mattress works in rooms of 10 x 10 feet or larger. For a queen, you'd typically want at least 10 x 12. If space is tight, a full makes sense — you'll have room for nightstands and won't feel boxed in.
The same rules apply as with any mattress size:
If you're over 230 lbs, look for a full mattress with a higher-density foam base or a hybrid design. Standard full mattresses are built for average-weight sleepers, and lighter construction will wear out faster under more weight. Aim for at least 12 inches of profile.
If you run warm at night, a hybrid or latex mattress with coil airflow will sleep cooler than dense all-foam options. Gel-infused foam also helps. This matters year-round in Southern California.
Full mattresses typically range from around $400 on the budget end to $2,000+ for premium models. Because full mattresses are slightly smaller than queens, they're often priced 5–15% less for the same model. That said, you get what you pay for on durability and material quality.
| Type | Feel | Best For | Lifespan |
|---|---|---|---|
| Memory Foam | Contouring, pressure-relieving | Side sleepers, pressure points | 7–10 years |
| Latex | Responsive, bouncy, breathable | Hot sleepers, eco-conscious buyers | 10–15 years |
| Hybrid | Balanced support + cushioning | Most sleepers, couples sharing | 8–10 years |
| Innerspring | Firm, traditional | Back/stomach sleepers, budget buyers | 6–8 years |
A no-frills innerspring option for those who need a compact, firm full. The 8-inch profile makes it well-suited for bunk beds, trundles, and smaller frames. The 460-count VertiCoil system provides consistent support, and the natural fire-resistant fiber barrier avoids harsh chemical treatments. Good value and comes with a 10-year warranty.
| Pros | Cons |
|---|---|
| Budget-friendly from a reputable brand | 8-inch profile feels shallow for some |
| Firm support — good for back/stomach sleepers | No foam encasement on edges |
| Compact profile suits bunk beds and trundles | Not ideal for side sleepers wanting cushion |
| Natural fire barrier, 10-year warranty | Long-term durability may not match premium models |
View the Spring Air Olive Firm →
The Justice Euro Top offers the classic euro-top cushioning over a traditional innerspring base. Medium-firm feel suits a range of sleepers, and the adjustable base compatibility adds flexibility. A solid choice for a guest room or everyday use at a value price point.
| Pros | Cons |
|---|---|
| Euro top adds comfort over a bare tight-top coil | Basic materials compared to higher-end models |
| Adjustable base compatible | Innerspring may transfer more motion than pocketed coil |
| Edge-to-edge support for full usable surface | Plush sleepers may find medium-firm too firm |
| 10-year warranty from Diamond Mattress | Value model — not built for heavy sleepers long-term |
View the Diamond Justice Euro Top →
We carry full mattresses across every material type — memory foam, hybrid, latex, and innerspring — from brands including Diamond, Sealy, Stearns & Foster, Tempur-Pedic, and more. You can test any of them in person at our LA showrooms before buying.
Can't find the right full size model? Our team can help you compare sizes and find something that fits your room, your sleep style, and your budget. We also offer a 120-night comfort guarantee and financing options.
54 inches wide by 75 inches long (approximately 137 cm × 191 cm). A Full XL is the same width (54") but 80" long.
Yes. "Full" and "double" refer to the same size. The terms are used interchangeably.
Technically yes, but it's tight. Each person would have about 27 inches of personal space — less than a single twin mattress. Most couples find a queen far more comfortable for sharing.
The same 54-inch width, but a Full XL is 80 inches long instead of 75. That extra 5 inches matters if you're close to or over 6 feet tall.
No. Full XL requires Full XL sheets due to the extra length. Standard full sheets will be 5 inches short at one end and won't stay tucked properly.
A room of at least 10 x 10 feet. This allows space for the mattress plus clearance on the sides for nightstands and walking.
Yes. It's a great step up from a twin — more room to stretch out without taking over the bedroom. Unless the teenager is already quite tall, a standard full (75" long) works fine.
Typically 50–90 lbs depending on material. Innerspring mattresses tend to be on the lighter end; thick hybrid or latex models are heavier.
A quality full mattress should last 8–10 years. Cheaper models may degrade in 5–7 years, especially with heavier use.
At any of our 5 LA Mattress Store showrooms. We carry a wide range of full size mattresses you can try before you decide. Same-day and next-day delivery available in the LA area.
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