What Size Is an RV King Mattress? Dimensions, Variations, and How to Measure

If you’re wondering “What Size Is An RV King Mattress”, you’re likely trying to match a mattress to a specific RV bed platform or shop for RV bedding that fits correctly. RV mattress sizes can be confusing because they often differ from standard home mattress dimensions.

This FAQ-style guide explains typical RV king mattress sizes, how they compare to regular king beds, and what to check before you buy or replace one.

What Size Is an RV King Mattress?

In many RVs, an RV king mattress is slightly narrower or shorter than a standard residential king.

The most common RV king mattress sizes are:

So when people ask “What Size Is An RV King Mattress”, they are usually referring to a king mattress that is:

• About 72 inches wide (a bit narrower than a standard king)
• 80 inches long (similar to a standard king)
  or
• 75 inches long in “short” versions

However, RV mattress sizes are not fully standardized, so exact dimensions can vary slightly by RV model and manufacturer.

Why Are RV King Mattresses Different From Regular Kings?

RVs have limited and uniquely shaped spaces. Manufacturers often use custom mattress sizes so beds can:

• Fit within slide-outs and tight corners
• Leave room for walking paths and storage
• Clear cabinets, doors, or walls when tilted or folded

Because of this, an RV king mattress is often:

• Narrower than a standard king
• Sometimes shorter (a “short king”)
• Occasionally rounded at the corners or cut at an angle

This is why measuring the exact sleep surface area in your RV is more reliable than assuming a standard king will fit.

How Do I Know Which RV King Size I Have?

Before buying or replacing an RV king mattress, it’s important to verify your specific dimensions, rather than relying only on labels.

How to measure your RV king mattress space

1. Remove all bedding so you can see the full mattress or platform.
2. Use a tape measure and record:
   • Width: side to side at the widest point
   • Length: head to foot at the longest point
3. Check for:
   • Rounded corners
   • Cut-out or angled corners
   • Any obstructions (walls, shelves, or wardrobes) that might limit usable space
4. Note whether your current mattress hangs over the platform or fits exactly.

This measurement will tell you which RV king size you really need, whether it’s a 72" x 80", a short RV king, or a different custom size.

Is an RV King Mattress the Same as a Standard King?

Usually not. Here’s how they commonly compare:

• A standard king is about 76" x 80".
• A typical RV king is often 72" x 80".
• A short RV king may be about 72" x 75" (sometimes slightly different).

This means:

• Standard king sheets may be too wide or too loose on some RV kings.
• A standard king mattress may be too large for an RV bed platform, especially in slide-outs.

When shopping for accessories, look for sheet sets, mattress toppers, and protectors that specify RV king or match your exact measurements.

Common Questions About RV King Mattress Sizes

Do all RVs use a 72" x 80" RV king?

No. While 72" x 80" is a common RV king size, some RVs use:

• 70" x 80"
• 72" x 75" (short king)
• Other custom dimensions

Always measure your specific RV bed platform to avoid surprises.

Can I trim or fold a standard king mattress to fit?

Standard mattresses are not designed to be cut or folded. Doing so can damage internal materials and cause uneven support. It’s generally better to:

• Find a mattress that matches your measured size, or
• Look for models specifically labeled for RV use in the size you need.

Will RV king mattresses feel smaller to sleep on?

Yes, they often feel slightly smaller because:

• The reduced width (for example, 72" vs. 76") gives each sleeper a bit less personal space.
• Short RV kings reduce legroom for taller sleepers.

For many people, the difference is manageable, but if you’re close to the mattress length in height, a short RV king may feel cramped.

What Should I Consider When Choosing an RV King Size?

When you’re deciding which RV king size is right for your space, focus on:

• Exact platform dimensions – Width and length down to the nearest half-inch.
• Slide-out clearance – Ensure the bed can move in and out without hitting walls or cabinets.
• Bedding compatibility – Check that you can find sheets and protectors in your size.
• Sleeper height and comfort – Taller sleepers may prefer full 80" length if possible.
• Corner shape – Note if your RV requires cut corners or radius corners.

📝 Tip: Write your measured dimensions on a label and keep it in a cabinet or with your owner’s manual. It makes future mattress or bedding choices much easier.

✔️ Quick Mattress Takeaways

Key points consumers should understand about “What Size Is An RV King Mattress”:

• There is no single universal answer to “What Size Is An RV King Mattress,” but common sizes include:
  • RV King: 72" x 80"
  • Short RV King: 72" x 75" (or similar)
• An RV king is usually smaller than a standard home king (76" x 80").
• Always measure your RV bed platform (width, length, and corner shape) before choosing a mattress.
• Standard king mattresses and bedding may not fit properly in RV king spaces.
• Knowing your exact dimensions helps you select a mattress and bedding that fit securely and make the best use of your RV’s limited space.

Understanding what size an RV king mattress is in your specific RV gives you the clarity you need to choose a comfortable, well-fitting sleep surface for your travels.