TL;DR: To measure RV cushions for replacement, always measure the existing cushion (not the bench frame) in three dimensions: length, width, and thickness. Measure seam to seam, then add 0.5" to length and width so the foam fills the cover fully. For odd shapes like L-shapes, rounded corners, or U-shaped dinettes, trace a cardboard template or send a photo and we'll sketch it out before cutting anything.
You finally decided to replace those flat, worn-out RV cushions. You grabbed a tape measure, you measured... something. Then your new cushions arrived and they didn't fit right.
It happens more than you'd think. And almost every time, it comes down to one mistake: measuring the wrong thing.
This guide will walk you through exactly how to measure custom RV cushions so your replacement arrives and fits perfectly the first time. No guesswork, no remakes.
Do You Measure the RV Cushion or the Bench Frame?
Measure your existing cushion, not the bench frame. The cushion and the frame are almost never the same size. A cushion is cut slightly larger than the frame so it fills the space with a snug, full look. If you measure the frame and order to that size, your new cushion will come in too small and look sunken.
The only time you should measure the frame is when your old cushion is so badly deformed that it no longer holds its original shape. If it's collapsed, lumpy, or has been sitting wet, it may have shrunk or warped. In that case, measure the open bench space instead and let us know when you order.
If your cushion is just flat or faded but still holds its general shape, measure the cushion. That's the right size.
One customer from Florida asked us this exact question twice before ordering. "Do I measure the cushion or the frame inside for a camper couch?" Both times, the answer was the same: the cushion. When she ordered that way, everything fit perfectly.
The 3 Numbers You Need
To order a replacement RV cushion, you need exactly three measurements: length, width, and thickness. That's it.
Here's how to get each one right.
Length and width: measure seam to seam
Place your cushion flat on the floor. Using a soft tape measure, measure from the stitched seam on one end to the stitched seam on the other end. Do this for both dimensions.
Don't measure from the outer edge of any piping or trim. Measure to the seam itself.
Once you have both numbers, add 0.5 inches to each dimension. So if your cushion measures 35.5" long, you order 36". This extra allowance means the foam will press firmly against the inside of the cover and give you that full, well-stuffed look instead of a saggy one.
Thickness: use a ruler and the floor
Don't try to measure thickness with a tape measure. It's too flexible and you'll get an inaccurate reading.
Instead, lay the cushion flat on a hard surface like a wood floor or kitchen counter. Hold a rigid ruler or straightedge on top of the cushion so it extends past the edge. Then measure straight down from the underside of the ruler to the floor. That's your foam thickness.
Write down all three numbers before you move to the next cushion. It sounds obvious, but it's easy to mix them up if you're measuring a whole dinette set.
How to Measure Odd-Shaped RV Cushions
RV cushions are rarely simple rectangles. If yours has rounded corners, an L-shape, a U-shape, or a trapezoid angle, measuring gets a little more involved. But it's still totally manageable.
Rounded corners
Measure the length and width as normal (seam to seam). Then measure the radius of the corner curve. A corner radius of 4–6 inches is common on RV dinettes. Write that down separately and note it when you order.
L-shaped or U-shaped dinettes
Break the shape into individual rectangular sections. Measure each section separately: its own length, width, and thickness. Also note where the sections meet and whether there's a seam or a hinge between them.
One customer in Colorado needed 7 custom cushions for a U-shaped dinette. She sketched her layout by hand, labeled every measurement, and sent us the sketch. We turned it into a production diagram, confirmed every dimension with her, and shipped the full set in about three weeks. She told us: "They look great! Thank you for helping me through the process."
You don't need to be precise with a sketch. A rough drawing with labeled measurements is enough. We'll do the rest.
Trapezoid or angled shapes
Measure the longest side, the shortest parallel side, and the depth from front to back. If there's an angled corner, note the approximate angle or just send a photo.
The cardboard template method
For any shape you're not sure how to describe, lay a piece of cardboard over the cushion space and trace the outline with a marker. Cut it out. You now have a template you can photograph and send to us, and we'll sketch the exact shape back to you for confirmation before anything gets cut.
5 Measuring Mistakes That Lead to Wrong-Sized Cushions
These are the most common errors we see. Avoid them and you'll get a perfect fit the first time.
1. Measuring a warped or sunken cushion
If your old cushion has been sitting wet or compressed for years, it may no longer be its original size. If it looks distorted, measure the bench frame instead and note that in your order.
2. Measuring the frame instead of the cushion
As covered above: the frame is smaller than the cushion. Ordering to frame dimensions gives you a cushion that looks undersized and loose.
3. Forgetting to measure thickness
Thickness matters a lot, especially on dinettes that fold flat for sleeping. A cushion that's too thick won't close properly. A cushion that's too thin feels like sitting on a board. The sweet spot for most RV seat cushions is 3–4 inches.
4. Skipping the 0.5" allowance
Foam compresses when it's inserted into a cover. If you order to the exact measured size, your cushion will look slightly flat and understuffed. Always add 0.5" to length and width.
5. Not measuring each cushion separately
On a standard two-person dinette, the seat cushions and back cushions are different dimensions. Don't assume they're the same. Measure each piece individually and label them clearly: "seat left," "back left," and so on.
How Thick Should Your RV Cushion Be?
For seat cushions used only for sitting, 3 to 4 inches of high-resilience foam is ideal. It gives you firm support without the sinking feeling of softer foam. For back cushions, 3 inches is usually enough.
If your RV dinette doubles as a sleeping surface, go with 4 to 5 inches. That extra inch makes a real difference when you're lying flat for more than a few hours. Several customers who use their dinette as a guest bed specifically ask us for firm foam at 4–5 inches, and it works well for both sitting and sleeping.
For cushions you want to use as a full mattress replacement, like in a pop-up camper or a van conversion, 5 to 6 inches gives you a proper sleeping surface. You can also ask us to connect the seat and back cushions with a strip so they lie flat as one piece.
What to Do With Your Measurements
Once you have your three numbers (plus any notes on shape or rounded corners), you're ready to order.
Here's how the process works with uscushion:
- Head to our RV and Camper Cushions page and select your cushion type.
- Enter your length, width, and thickness into the order form.
- Choose your foam density and fabric from our full gallery. Not sure which fabric to pick? We can send physical swatches for around $24 in shipping, delivered in 7–10 days.
- For any non-standard shape, add a note or photo. We'll send you a confirmation sketch before we cut anything.
- Once you approve the details, we build your cushion by hand and ship it in 14–18 days.
If at any point you're unsure, you can reach us through our contact page. We respond quickly and always confirm measurements in writing before production starts. Check our FAQ page for more common questions.
Conclusion
Measuring RV cushions correctly comes down to three things: measure the cushion (not the frame), get three numbers (length, width, thickness), and add 0.5" to length and width before you order.
For odd shapes, don't stress. A photo or a rough cardboard template is all we need to get started.
The hardest part of replacing RV cushions isn't the measuring. It's making the decision to finally do it. Once you've got your numbers, the rest is easy. Start your custom RV cushion order here and we'll take it from there.
Frequently Asked Questions
Do I measure the RV cushion or the bench frame?
Measure your existing cushion, not the bench frame. The cushion is cut slightly larger than the frame to fill the space properly. If you measure the frame, your new cushion will come in too small. The only exception is if your old cushion is so warped or collapsed that it no longer holds its original shape. In that case, measure the open frame and let us know.
What tools do I need to measure RV cushions?
You need a soft tape measure (flexible fabric tape, not a metal carpenter's tape), a rigid ruler or straightedge for measuring thickness, a pencil, and paper to write everything down. A phone camera is also handy for capturing shapes and sending photos for odd-shaped cushions.
How do I measure an L-shaped or U-shaped RV dinette cushion?
Break the shape into individual rectangular sections and measure each one separately: length, width, and thickness. Note where each section meets the next. For curved or angled edges, a rough hand sketch with labeled measurements is enough. You can also trace the shape onto cardboard, photograph it, and send it to us. We'll create a confirmation sketch before anything is cut.
Should I add extra inches when measuring for custom cushions?
Yes. Add 0.5 inches to both the length and width of your measured dimensions. This allowance accounts for foam compression when it's inserted into the cover. Without it, your cushion will look slightly flat and understuffed. Do not add extra to the thickness measurement.
What if my old cushion is already sagging and misshapen?
If your cushion has compressed or warped over time, don't use it as your measurement reference. Instead, measure the bench frame opening: the length, width, and depth of the space the cushion sits in. Then order to those frame dimensions and note in your order that you measured the frame, not the cushion. We can adjust accordingly.
