Full Size Mattress Dimensions: Exact Measurements and Who It's Right For

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.

02Full Size Mattress: Exact Dimensions

A standard full size mattress measures:

  • Width: 54 inches (137 cm)
  • Length: 75 inches (191 cm)

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.

03How a Full Compares to Other Mattress Sizes

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.

04Who Should Choose a Full Mattress?

Full is a good fit if you:

  • Sleep alone and want more room than a twin without going full queen
  • Are a teenager upgrading from a twin bed
  • Have a guest room where occasional use matters more than maximum space
  • Live in a studio apartment or smaller bedroom where a queen feels cramped
  • Share the bed with a small pet
  • Are under 6 feet tall (the 75-inch length works comfortably for most people under 6'2")

Full is not ideal if you:

  • Share with a partner — 27 inches per person is genuinely tight
  • Are taller than 6'2" — your feet will hang off (consider a Full XL or Queen instead)
  • Are a heavier sleeper — a queen or king gives you more structural room
  • Move around a lot during sleep — you'll feel constrained

05What to Consider When Buying a Full Mattress

Room Size

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.

Sleeping Position

The same rules apply as with any mattress size:

  • Side sleepers: Look for a medium or medium-soft mattress with good pressure relief — memory foam or hybrid works well
  • Back sleepers: Medium-firm gives you the spinal support you need without being too hard
  • Stomach sleepers: A firmer surface prevents the hips from sinking and bowing the lower back

Body Weight

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.

Cooling

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.

Budget

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.

06Mattress Types Available in Full Size

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

07Top Full Size Mattress Picks

1. Spring Air Value Collection Olive Firm 8"

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 →

2. Diamond Justice Medium Tight Top 7" Euro Top

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 →

08Explore Full Size Options at LA Mattress Store

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.

Browse full size mattresses →

09Frequently Asked Questions

What are the exact dimensions of a full size mattress?

54 inches wide by 75 inches long (approximately 137 cm × 191 cm). A Full XL is the same width (54") but 80" long.

Is a full mattress the same as a double?

Yes. "Full" and "double" refer to the same size. The terms are used interchangeably.

Can two adults share a full mattress?

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.

What's the difference between a full and full XL?

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.

Will standard full size sheets fit a full XL?

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.

What room size works best for a full mattress?

A room of at least 10 x 10 feet. This allows space for the mattress plus clearance on the sides for nightstands and walking.

Is a full mattress good for teenagers?

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.

How much does a full size mattress weigh?

Typically 50–90 lbs depending on material. Innerspring mattresses tend to be on the lighter end; thick hybrid or latex models are heavier.

How long does a full size mattress last?

A quality full mattress should last 8–10 years. Cheaper models may degrade in 5–7 years, especially with heavier use.

Where can I test full mattresses in Los Angeles?

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.