Choosing the right mattress size is about more than just dimensions. It affects how your room feels, whether the mattress fits through your doorways and up your stairs, and whether it works with your foundation or adjustable base. This guide covers every standard mattress size, plus practical tips for room planning, delivery logistics, and specialty configurations.
Standard Mattress Size Chart
| Size | Dimensions | Surface Area | Best For |
|---|---|---|---|
| Twin | 38" × 75" | 2,850 sq in | Children, bunk beds, small rooms |
| Twin XL | 38" × 80" | 3,040 sq in | Taller teens, dorm rooms, split King |
| Full (Double) | 54" × 75" | 4,050 sq in | Single sleepers, guest rooms |
| Queen | 60" × 80" | 4,800 sq in | Couples, most popular size |
| King | 76" × 80" | 6,080 sq in | Couples who want maximum width |
| California King | 72" × 84" | 6,048 sq in | Taller couples, narrow bedrooms |
| Split King | 76" × 80" (2× 38"×80") | 6,080 sq in | Adjustable bases, differing preferences |
Room Planning Tips
Before you fall in love with a King, measure your room. A mattress that is too large can make a bedroom feel cramped and block closet or bathroom doors. Here is a general guide for room size by mattress:
| Mattress Size | Minimum Room Size | Comfortable Room Size |
|---|---|---|
| Twin / Twin XL | 7' × 10' | 8' × 10' or larger |
| Full | 9' × 9'6" | 10' × 11' or larger |
| Queen | 10' × 10' | 10' × 12' or larger |
| King / California King | 12' × 12' | 12' × 14' or larger |
Leave at least 18–24 inches of clearance on three sides of the bed for easy sheet changing, vacuuming, and comfortable movement. If your room has a closet or bathroom door that swings into the bed area, account for the door arc when measuring.
Doorways, Stairs, and Delivery
The most common delivery problem is not the room size — it is the path to the room. A King mattress that cannot navigate a tight stairwell or a narrow hallway turn is not a deal at any price. Before you order:
- Measure your doorway widths — most interior doors are 30" wide, and some older homes have 28" doors.
- Check stairwell width and any turns or landings. A King mattress needs at least a 36" clearance to navigate most turns.
- Note ceiling height in hallways — low ceilings can prevent maneuvering a large mattress around corners.
- If access is tight, ask about a split-boxspring or a King mattress that can be safely flexed for delivery.
Metro Mattress of Georgia offers white-glove delivery, and our team can advise on access challenges before you commit. Contact your nearest showroom to discuss delivery logistics.
Foundations and Adjustable Bases
Your mattress size affects your foundation or base options. Here is what to know:
- Most mattresses require a foundation or platform that matches the mattress dimensions. A Queen mattress needs a Queen foundation.
- Adjustable bases are available in all standard sizes. For independent articulation, choose a Split King (two Twin XL mattresses on a split base).
- Some mattresses are not compatible with adjustable bases — check the manufacturer specifications before combining.
- Platform beds with slats must have slats spaced closely enough to support the mattress (typically 3–5 inches apart). See our Foundation Guide for details.
Split, RV, and Custom Sizes
Not every mattress fits a standard size. Split King setups use two Twin XL mattresses for adjustable-base compatibility. RV mattresses come in shorter lengths (RV Queen at 60"×75", RV King at 72"×80") and may have rounded corners. Custom sizes for antique frames, boat bunks, or unusual platforms require precise measurements.
For a full guide to measuring and ordering custom and RV sizes, see our Custom & RV Mattress Size Guide.
What to Test or Ask in a Showroom
- ›Bring your room dimensions and doorway measurements so the Sleep Team can confirm fit.
- ›Ask which sizes are currently in stock for fast delivery.
- ›If you are considering an adjustable base, ask which mattresses are compatible.
- ›Mention any tight stairs or narrow hallways so the team can plan delivery access.
- ›If you need a custom or RV size, ask about production timelines.
Ready to pick your size? View our full size guide or visit a showroom to see different mattress sizes in person. Our Sleep Team can help you confirm dimensions and delivery access before you buy.
Sources and Review Standards
This guide was reviewed by the Metro Mattress of Georgia Sleep Team for accuracy. Sources consulted:
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