Standard US mattress size chart comparing Twin, Twin XL, Full, Queen, King, and California King beds.

Mattress Size Guide 2026: Twin XL vs Full vs Queen vs King — What’s Right for You?

The Right Size Makes All the Difference

Choosing the right mattress size isn’t just about what fits your room — it’s about how you sleep. Whether you’re furnishing a guest space, upgrading for two, or setting up a master suite, the size of your bed can transform your nightly comfort.

In this 2026 Mattress Size Guide, we’ll compare Twin XL, Full, Queen, King, and Split King sizes to help you decide which one fits your space, budget, and lifestyle best.

Mattress Size Chart (Quick Reference)

Mattress Size

Dimensions (inches)

Best For

Notes

Twin

38” x 75”

Kids, teens, dorm rooms

Compact and budget-friendly

Twin XL

38” x 80”

Tall sleepers, guest rooms

Adds 5” of length for comfort

Full (Double)

54” x 75”

Solo adults or small rooms

Slightly wider than a Twin

Queen

60” x 80”

Couples or single sleepers wanting extra space

Most popular size in the U.S.

King

76” x 80”

Couples with large bedrooms

Spacious, luxury feel

Split King

2 Twin XLs = 76” x 80”

Couples with different sleep needs

Ideal for adjustable bases

 

Twin vs Twin XL — Small Rooms, Big Comfort

If you’re designing a guest room or kid’s room, a Twin or Twin XL is often the best fit.

  • Twin beds work well for tight spaces or bunk setups.
  • Twin XL adds five extra inches in length — perfect for taller sleepers or college dorms.

👉 Pair with a Folding Platform Base to maximize under-bed storage.

Steel Folding base without mattress and bedding in a well lit room with large windows

Full (Double) — Comfort for One, Cozy for Two

A Full mattress offers a bit more width than a Twin, making it comfortable for a single sleeper who likes extra space.

It’s also a common upgrade for guest rooms or small apartments where a Queen might be too large.

💡 Tip: Add a plush topper for a hotel-like feel without taking up extra floor space.

🔗 Suggestion: Copper-Infused Bedding: Real Benefits (No Hype)

Full vs queen mattress, best mattress for guest room

Queen — The Universal Favorite

The Queen size mattress hits the sweet spot between comfort and practicality. It’s ideal for couples or solo sleepers who like to stretch out.

  • Fits most bedrooms (10x10 ft or larger)
  • Works beautifully with adjustable bases
  • Widely available in bedding, frames, and accessories

👉 See our Rio 4.0 Adjustable Base for a perfect Queen-size upgrade.

Couple in a Rio Adjustable Bed base. king size bed/ mattressQueen vs king mattress, best queen bed for couples

King — Room to Stretch, Sleep, and Relax

A King bed provides the ultimate sleeping space for two, or for anyone who likes to sprawl out in luxury.

  • Great for master bedrooms 12x12 ft or larger
  • Perfect for couples who share their bed with kids or pets
  • Pairs beautifully with statement headboards or upholstered frames

🔗 Suggestion: Upholstered Bed Buying Guide

Luxurious bedroom with a gray bed, headboard with wings, chandelier, and large windows. Brass Bed legs. King size bed / mattress

King vs queen mattress, king bed dimensions

Split King — Adjustable Comfort for Two

If you and your partner have different sleep preferences, the Split King is the modern solution. It combines two Twin XL mattresses side by side — each adjustable independently.

Benefits:

  • Independent head and foot control
  • No motion transfer between partners
  • Compatible with most premium adjustable bases

👉 Explore the Rio 5.0 Elite Adjustable Base — perfect for Split Kings.

🔗 Suggestion: Sleep Number Alternatives That Won’t Break the Bank

Split king adjustable bed, split king pros and cons, split king vs king

Choosing the Right Mattress Size for Your Space

Before finalizing your purchase, consider:

  1. Room size – Leave at least 2–3 feet of walking space on each side.
  2. Sleep style – Side sleepers often need more space for movement.
  3. Future plans – Will this be your “forever bed” or a temporary setup?

💡 Tip: Measure twice before ordering. Remember to include headboard and frame dimensions.

Bringing It All Together

Your bed is more than just a place to sleep, it’s the centerpiece of your entire bedroom.

Whether you’re upgrading to a Queen for more space, going all-in with a Split King adjustable bed, or refreshing your guest room, choosing the right size sets the tone for better rest and a better lifestyle.

Luxurious bedroom with a large King size bed / mattress, chandelier, and decorative elements. Headboard has nailheads. white sheets and soft pillows

Ready to find your perfect fit?

Explore Owen Holmes Bedding & Adjustable Bases for refined designs that elevate every night’s sleep.

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