Skip to Content

DIY Custom RV Mattress

Is the mattress that came in your camper uncomfortable? Do you want a better night’s sleep while camping? Get a new one with this Custom RV Mattress mod.

One of the biggest complaints that people have about RVs is the sucky mattresses. The foam used by the manufacturers is thin and does not offer much support.

You can order a custom mattress, but they are expensive! This is true when you realized that RV Mattress Sizes vary from model to model.

thin queen RV mattress inside a motorhome

How to Save Money on a Custom RV Mattress

Our brand new class C motorhome came with a 4” piece of foam for the queen mattress. We slept on it one night and realized that we need to change it right away.

Since we dropped a bunch of money on the purchase of the RV, so we did not want to spend a lot on a new bed. We found a sale and got an 8” memory foam Serta mattress from Sam’s for $200. The bed in a box included free delivery, which made this project much easier.

memory foam mattress in a box

memory foam mattress from a box laid out on a bed in a camper

Can you cut a memory foam mattress?

Have you ever wondered if you can cut a memory foam mattress? The answer is yes! It can be a messy process, but so worth it to get the desired size of bed. Particularly in an RV.

cutting a memory foam to create a custom RV mattress

The process is easy! We cut ours in place in our camper.

If your bed is in a tight spot that will make cutting difficult, you can open the mattress elsewhere and use the old mattress as your cutting guide.

We only had to make one cut for our bed. We started with a utility knife, switched to a long serrated knife, and finally discovered that a big straight knife worked best.

Electric knives work well for cutting memory foam mattresses.

custom foam mattress for an RV

We are so happy to have a regular mattress in our camper! Good sleep is a treasure, especially when you are away from home.

We use a regular queen-size sheet on this corner-cut mattress. We tuck the looseness underneath.

Replacing a Foam Mattress

The over-cab bunk foam mattress on our brand new motorhome is even more uncomfortable than the main bed mattress. Our 100-pound child created a dent in it after two nights.

We used the main bed foam to replace the over the cab mattress. This was a little trickier because of the size of this bed.

I ended up replacing the part that our daughter sleeps on. She is more comfortable now.

This is done the same way. I removed the cover on the foam, laid the replacement on top, marked the cutting lines on both, cut, replaced, and put the cover back on. This was a much messier process than the regular mattress.

Unless someone crawls around up there above the cab, you do not even notice the replacement. We plan to keep this RV for a long time (if you know our track record, you will laugh), so we are trying to keep it as intact as possible.

custom motorhome mattress for overhead bunk on the outside of an RV

Where do you get sheets for an RV mattress?

I used the flat sheet from the queen sheet set that I purchased for our RV bed to create a custom sheet for this upper bunk. It is easy to turn a flat sheet into a fitted sheet. If you do not sew, then get RV sheets online.

Many people add a topper to their crappy RV mattress, but that is not satisfactory for us. Camping is our ultimate relaxation time, so we need a regular thick mattress. A regular bed was a consideration when we picked out our new RV.

man standing the doorway of a motorhome holding a piece of foam

What do you do to get a comfortable night’s sleep when you camp?

Check out our other RV hacks: Running Lights On While Parked or Trailer Tongue Storage Mod.

collage showing before and after of a DIY camper mattress replacement

Yield: 1

Custom RV Mattress

a custom cut in a memory foam mattress in an RV

You can create your own Custom Camper Mattress with this easy to follow tutorial. No more uncomfortable nights in your RV!

Prep Time 2 hours
Active Time 30 minutes
Total Time 2 hours 30 minutes
Difficulty medium
Estimated Cost $300

Materials

  • 1 memory foam mattress in a box

Tools

  • measuring tape
  • marker
  • long knife

Instructions

    1. Measure the mattress you want to replace.
    2. Get a mattress in a box that is larger than this mattress.
    3. Remove the old mattress.
    4. Open up the new mattress and roll it out where it will go in your RV.
    5. Let the mattress expand.
    6. If there is a mattress cover, remove it.
    7. Mark the cut line(s) with a marker. Use the old mattress as a template.
    8. Use a long knife to cut down the mattress along the lines.
    9. Replace the mattress cover.
    10. Enjoy your upgraded mattress!



Recommended Products

As an Amazon Associate and member of other affiliate programs, I earn from qualifying purchases.

Did you make this project?

Please share a photo on our Facebook page or on Pinterest!

Let's Camp S'more is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com.
Skip to Instructions