What Size Is A Rv King Mattress

If you’re shopping for a new bed for your motorhome or fifth wheel, you might be asking, what size is a RV king mattress? It’s a common question, but the answer isn’t as simple as you might hope. Unlike standard home mattresses, RV mattress sizes can vary quite a bit. This guide will walk you through everything you need to know to get the perfect fit for your recreational vehicle.

Choosing the wrong size can lead to a frustrating return process or a mattress that just doesn’t work in your space. We’ll cover the standard dimensions, the different types of RV king beds, and how to measure your space correctly. You’ll also learn about thickness, common shapes, and where to buy a mattress that fits your needs and budget.

Let’s get straight to the point. There are two primary “standard” sizes for a king mattress in an RV. However, manufacturers don’t always stick to these, so measuring is always step one.

RV Short King: This is the most common type of RV king mattress. It measures 72 inches wide by 75 inches long (6 feet by 6 feet 3 inches). It’s the same width as a standard residential king but is 5 inches shorter in length.
RV Residential King: Sometimes, especially in larger, high-end coaches, you might find a true standard king. This mattress is 76 inches wide by 80 inches long (6 feet 4 inches by 6 feet 8 inches). Always verify, as some brands might use a 72″ x 80″ Eastern King size too.

The short king is popular because it saves crucial space in the bedroom area of an RV. Those extra few inches can make a big difference in walkways and closet doors.

Why RV Mattress Sizes Are Different

RV manufacturers design vehicles with space efficiency as a top priority. Every square inch counts. A shorter or slightly narrower mattress allows for better traffic flow, additional storage cabinets, or even just room to open a bedroom slide-out. It’s all about maximizing a compact living area.

Another reason is weight. While a mattress itself isn’t the heaviest item, using slightly smaller dimentions helps keep overall weight down. This is important for staying within your vehicle’s weight limits.

How to Measure Your RV Bed Space

Before you buy anything, you need to know the exact size of your existing bed platform or the space available. Here’s a simple step-by-step process:

Clear the Area: Remove all bedding, including the mattress topper and any pads.
Measure the Platform: Use a metal tape measure for accuracy. Measure the width and length of the wooden or metal bed base. Measure in at least three places for both width and length, as the platform might not be a perfect rectangle.
Note the Smallest Measurement: Use the smallest width and length you find. This ensures your new mattress will definitely fit.
Check for Obstructions: Look for things that might get in the way. Measure the height from the platform to any overhead cabinets. Note the location of walls, corners, and electrical outlets. A mattress that’s too thick might hit a cabinet door.
Consider the Corner Shape: Many RV beds have one or more rounded corners to fit the vehicle’s curvature. You’ll need to note the radius of these corners.

Understanding Mattress Thickness (Height)

Thickness is just as important as length and width. A mattress that’s to tall can cause problems.

Standard RV Mattress Thickness: Many OEM (original equipment manufacturer) RV mattresses are relatively thin, often 6 to 8 inches. This is to clear under-bed storage or overhead compartments.
Replacement Mattress Thickness: When upgrading, you can often go thicker. Common replacement thicknesses are 10, 12, or even 14 inches. Always measure the available vertical space first.
The Topper Factor: Remember to account for the height of any mattress topper you plan to use if you’re measuring with the old mattress still in place.

Types of RV King Mattresses Available

Once you know your size, you can choose the material and construction. Each has it’s pros and cons for life on the road.

Memory Foam: Excellent for motion isolation (great if your partner moves around). It conforms to your body shape. However, some lower-density foams can sleep hot and may off-gas initially.
Innerspring: Traditional coil support. It’s generally bouncier and has better airflow. But, it can be heavier and the coils can be affected by constant road vibration over time.
Latex: Durable, responsive, and naturally cooling. It’s also hypoallergenic. The main downside is a higher price point and significant weight.
Hybrid: Combines coils with foam or latex layers. This aims to give you the best of both worlds: support and pressure relief. Weight and cost are considerations.

Dealing with Odd Shapes and Sizes

Does your bed have a weird corner or an unusual size? You’re not alone. Many RVs have custom-shaped mattresses.

Custom Order: Many online mattress companies specialize in custom RV sizes. You provide the exact dimensions and shape, and they build it for you.
Mattress Modification: Some local upholstery shops or mattress stores can cut down a standard mattress to your needed size and shape. They then re-seal the edge.
Flexible Mattress Options: Some mattresses, like those made of certain foam layers, can be carefully trimmed at home with an electric knife. This is risky and usually voids the warranty.

Where to Buy an RV King Mattress

You have several good options for finding your new mattress.

RV Dealerships: They often sell replacement mattresses that match OEM specs. Convenient, but selection may be limited and prices higher.
Specialty Online Retailers: Websites dedicated to RV mattresses are a fantastic resource. They understand the unique sizing and often offer custom sizing, trial periods, and home delivery.
Standard Mattress Stores: You might find a short king at a major mattress chain, but it’s less common. Always call ahead to check inventory.
Direct-to-Consumer Brands: Many popular bed-in-a-box companies now offer RV sizes like the short king. They usually come compressed in a box, which is easy to get into the RV.

Tips for a Smooth Purchase and Installation

A few extra steps can make the whole process easier.

Check the Doorway: Measure your RV door to ensure the mattress (or box) can fit inside. A compressed mattress in a box is much easier to maneuver.
Ask About Returns: Understand the return policy and who pays for return shipping. A mattress that doesn’t fit is a big problem.
Allow for Off-Gassing: If you choose a foam mattress, unbox it and let it air out for 24-48 hours before sleeping on it, if possible.
Use a Mattress Protector: Invest in a high-quality, waterproof protector. It will guard against spills, moisture, and allergens, extending the life of your investment.

FAQs About RV King Mattress Sizes

Q: Is an RV king the same as a regular king?
A: Usually not. A standard RV king (short king) is 72″ x 75″, while a regular residential king is typically 76″ x 80″. Always measure you’re space.

Q: Can I use a regular king mattress in my RV?
A: Only if your bed platform is designed for it. In most RVs, a regular king will be too long and possibly to wide, blocking walkways or cabinets.

Q: What is the most common RV king size?
A: The 72″ x 75″ short king is by far the most common size found in production recreational vehicles.

Q: Are RV mattresses less comfortable than home mattresses?
A: OEM mattresses are often made with cheaper materials to save cost and weight. However, the replacement market offers many high-comfort options identical to home mattresses, just in RV sizes.

Q: How much does a good RV king mattress cost?
A: Prices vary widely. You can spend a few hundred dollars for a basic foam model to over $2,000 for a high-end hybrid or latex custom mattress. Quality materials and construction affect price.

Q: Do I need a special box spring?
A> RVs rarely use a traditional box spring. The mattress usually sits directly on a solid or slatted platform. Some people add a bunkie board for extra air flow and support.

Making Your Final Decision

Choosing the right mattress is key to getting good sleep on the road. Start with precise measurements of your bed space. Decide on a budget and the type of feel you prefer—plush, firm, or somewhere in between. Read reviews from other RV owners, as they understand the unique needs of vehicle living.

Remember that a good night’s sleep makes every trip more enjoyable. Investing time in finding the correct answer to ‘what size is a RV king mattress’ for your specific rig will pay off for years to come. Don’t rush the process, and don’t assume standard sizes will fit. With the information here, you’re well equiped to make a smart, comfortable choice for your home on wheels.