Quick answer: A standard U.S. king mattress is usually 76 × 80 inches. “RV king” is not one universal size: current listings include 70 × 74, 70 × 80 and 72 × 80 inches. Measure your RV’s sleeping platform and clearance, then check the dimensions of the exact mattress before ordering.
There is no rule that a regular king cannot be used in an RV. It can work if the sleeping area, entry path, weight limits and nearby doors and storage permit it. Information checked October 26, 2026; size labels and product availability vary.
RV king vs. king: the difference
The standard king offers 76 inches of width. Many RV-labeled kings are narrower or shorter to fit compact spaces, but manufacturers use the label for different measurements. A six-inch difference in length can matter to a tall sleeper; even a few inches of additional width can block a walkway or cabinet.
Compare actual dimensions
| Example | Width × length | Compared with a 76 × 80 king |
|---|---|---|
| Standard king | 76 × 80 inches | Reference size |
| RV king example | 70 × 74 inches | 6 inches narrower and 6 inches shorter |
| RV king example | 70 × 80 inches | 6 inches narrower, same length |
| RV king example | 72 × 80 inches | 4 inches narrower, same length |
| Short king example | 72 × 75 inches | 4 inches narrower and 5 inches shorter |
| California king | 72 × 84 inches | 4 inches narrower and 4 inches longer |
These examples appear in Brooklyn Bedding’s size options and Mattress Insider’s RV guide. Some companies use different labels for the same dimensions. The measurements on the product you select are the ones to use.
How to measure your RV bed
- Measure the platform’s width and length at several points. Note corners, curves, steps or obstructions.
- Measure the old mattress and check its label, but compare it with the available space in case it has compressed.
- Measure the headroom and mattress height. A thicker mattress can interfere with overhead cabinets, windows or a bunk above.
- Check doors, drawers, slides and the walkway with the bed in use. Leave sufficient room for each to operate.
- Inspect under-bed storage and ask the RV maker about platform and lift-strut weight limits.
- Measure the entry door and route into the RV. Ask the seller about packaging and expansion, particularly for a one-piece king.
If the corners are rounded, photograph and measure them and ask a custom mattress seller how to supply a template. Do not assume a square-corner mattress will bend to fit without changing support.
Will regular king sheets fit?
A standard king fitted sheet is sized for a 76 × 80-inch mattress, so it may be loose on a narrower RV king. Depth matters as well as width and length. Measure the mattress, including any topper, and compare the sheet’s listed dimensions and pocket depth. RV-specific sheets, elastic straps or a custom sheet can help, depending on the shape.
A flat sheet, duvet or blanket may be more forgiving, but check the desired overhang. California king bedding is longer than standard king bedding and will not automatically fit an RV king labeled 72 × 80.
Choosing comfort, height and support
Foam: Some foam models come in thin profiles and many RV sizes. Feel and weight depend on construction; do not assume every RV mattress is lightweight.
Hybrid: A coil-and-foam mattress can offer a more responsive feel, but check its height and weight against the platform and storage lift.
Custom: A custom shape can solve a curved or unusually sized space. Confirm manufacturing tolerance, lead time, delivery, cancellation and return terms before placing the order.
Use the foundation recommended by the mattress maker. In an RV, inspect the underside periodically for condensation and follow the RV and mattress manufacturers’ ventilation guidance.
RV king mattresses to compare
Brooklyn Bedding Essential: The current Essential product listing offers several RV king dimensions and multiple height options. Choose the exact width, length and height that fit. Yawnder sells some Brooklyn Bedding products; check the current manufacturer listing.
Brooklyn Bedding Signature Hybrid: The product listing includes multiple RV king sizes and firmness options. Compare its total height and weight with your platform before ordering. See the Signature Hybrid.
Mattress Insider: Its RV range includes standard and custom shapes. Ask about curved corners, size-verification requirements and the applicable custom-order return policy. See Mattress Insider’s RV options.
For more choices and a short-queen comparison, read our RV mattress buying guide.
Frequently asked questions
Is an RV king always 72 × 80?
No. RV king listings also include 70 × 74 and 70 × 80. Check your specific platform and the selected product’s measurements.
Can a regular king mattress fit in an RV?
Yes, if the RV can accommodate 76 × 80 inches plus the mattress height and weight, and doors, slides and storage remain usable.
Is an RV king the same as a California king?
Not necessarily. A California king is typically 72 × 84 inches; an RV king can be shorter and may have a different width.
Can I use a topper to change the feel?
Possibly, but include its thickness in headroom and fitted-sheet measurements. A topper cannot reliably repair a sagging mattress or damaged platform.
Do RV king mattresses need special sheets?
Not always, but sheets matched to the exact dimensions and depth generally fit better than standard king sheets on a narrower or shorter mattress.
Final take: Pick the measurements that fit your specific RV, then compare feel, height, weight and return terms. The label alone cannot tell you whether the bed will fit.