RV Mattress Size Calculator: What Actually Fits Your Bed

Measure the platform and order by the two numbers, because the size names do not agree with each other. “RV King” is published as 70 × 74, 70 × 80 and 72 × 80 by different sellers — and Lippert, which builds a great many of the beds, calls 72 × 80 a Narrow King and keeps “King” for 76 × 80.

One name, three sizes

Every page that ranks for this hands you a chart of names. Here is what three of those charts actually say about the same words:

Name	Lippert	Mattress Insider	RV Mattress
Short Queen	60 × 75	60 × 74 or 60 × 75	60 × 74 or 60 × 75
Queen	60 × 80	60 × 80 (“RV Queen”)	60 × 80 (“Standard Queen”)
72 × 80 is called	Narrow King	RV King	RV King
“RV King” means	—	70 × 74, 70 × 80, 72 × 80	70 × 74, 70 × 80, 72 × 80
76 × 80 is called	King	RV Standard King	Standard King

Read the bottom two rows together. “RV King” covers three different sizes, and the widest of them is four inches narrower than what Lippert calls a King. A reader with a 70 × 74 platform who is told they have an “RV King” and orders one can receive 72 × 80 — two inches too wide and six too long.

What the company that builds the bed calls it

It is worth separating Lippert from the rest, because its figures are manufacturer specifications rather than a buying guide.

Lippert publishes four bedroom sizes, per part number, with dimensions and thickness: Short Queen 60 × 75, Queen 60 × 80, Narrow King 72 × 80 and King 76 × 80. Two of those names match residential sizes exactly — Lippert’s Queen and King are the same 60 × 80 and 76 × 80 you would buy for a house.

That is the source of the confusion. The RV mattress trade needed a word for the 72 × 80 that RV bedrooms often are, and settled on “RV King”, while the manufacturer had already used “King” for the real king and called 72 × 80 narrow. Both are defensible. Neither is safe to order by.

The five inches at the foot of the bed

The most common RV bedding surprise has nothing to do with kings.

A Short Queen is 60 × 75. A Queen is 60 × 80. Five inches, and it catches people twice:

• Buying bedding. Standard queen sheets on a short queen billow at the foot and pull off the corners.
• Replacing the mattress. A short queen dropped onto a platform built for a queen leaves five inches of bare board where the duvet dips and a draught sits.

That second case is common enough that Lippert sells a Short Queen RV Bed Extender to fill it — a product that exists purely because of a five-inch naming gap. We have not put dimensions to it here: Lippert lists three variants as 30 × 6 × 6, 30 × 6 × 8 and 30 × 6 × 10 while its own description says “Add six, eight or 10 inches to the length of your mattress”, so the varying dimension is a height in the specification and an added length in the prose. Those cannot both be true, and it seemed better to name the product than to publish a measurement we cannot read.

Thickness has no standard at all

Mattress Insider states it without hedging: “RV mattresses have no standard height or thickness.”

The two Lippert lines here are 10 inches (Thomas Payne Premium) and 8 inches (Wander & Rest Standard), in the same four sizes. Which you want is not a comfort question first — it is a clearance question:

• A bed under a slide-out has to let the slide close.
• A bed under an overhead locker has to leave room to sit up.
• A bunk has to leave head room for whoever is in it.

Measure from the platform to whatever is above it, and put that figure into the calculator. It will drop anything too tall before it recommends on fit.

Bunks are a different problem

Both size tables list six bunk sizes: 28 × 75, 30 × 75, 30 × 80, 32 × 74, 34 × 75 and 35 × 79. Six answers to what sounds like one question.

The calculator recognises a bunk-sized measurement and says it is out of scope rather than offering a bedroom mattress that cannot fit. We could not reach a manufacturer page giving bunk dimensions against a part number, and a bunk is exactly the place where a guessed dimension does harm — it is the tightest space in the rig and usually has a child in it.

Model	Lippert's name	Size	Thickness	Construction	Warranty	Buy
Thomas Payne Premium Short Queen	Short Queen — as Lippert names it	60 in wide x 75 in long x 10 in thick	10 in	10 in dual foam: 1 in of 2.2 lb memory foam infused with charcoal cooling gel over a 9 in base of 1.56 lb foam	10-year warranty, 12-month compression guarantee	Check price(opens in a new tab)
Thomas Payne Premium Queen	Queen — as Lippert names it	60 in wide x 80 in long x 10 in thick	10 in	10 in dual foam: 1 in of 2.2 lb memory foam infused with charcoal cooling gel over a 9 in base of 1.56 lb foam	10-year warranty, 12-month compression guarantee	Check price(opens in a new tab)
Thomas Payne Premium Narrow King	Narrow King — as Lippert names it	72 in wide x 80 in long x 10 in thick	10 in	10 in dual foam: 1 in of 2.2 lb memory foam infused with charcoal cooling gel over a 9 in base of 1.56 lb foam	10-year warranty, 12-month compression guarantee	Check price(opens in a new tab)
Thomas Payne Premium King	King — as Lippert names it	76 in wide x 80 in long x 10 in thick	10 in	10 in dual foam: 1 in of 2.2 lb memory foam infused with charcoal cooling gel over a 9 in base of 1.56 lb foam	10-year warranty, 12-month compression guarantee	Check price(opens in a new tab)
Wander & Rest Standard Narrow King	Narrow King — as Lippert names it	72 in wide x 80 in long x 8 in thick	8 in	8 in dual foam: a 2 in gel-infused polyurethane flex foam layer over a 6 in supportive base, quilted 100% polyester fire-retardant cover, CertiPUR-US certified, no fiberglass	10-year warranty, 1-year compression guarantee	Check price(opens in a new tab)

Where this goes wrong

• Ordering by the size name. “RV King” is three sizes. It is the single mistake this page exists to prevent.
• Measuring the old mattress instead of the platform. The one in there may already be wrong, which is how the problem repeats.
• Forgetting the headroom. Two extra inches of foam can stop a slide closing.
• Assuming a short queen takes queen bedding. Five inches short, and fitted sheets will not stay on.
• Buying a bunk mattress from a bedroom chart. Six published bunk sizes, none of them a bedroom size.
• Ignoring cut corners. Plenty of RV mattresses have a radiused or cut corner to clear a wall or a wheel arch, which no rectangular measurement captures — check the shape as well as the size.

Questions worth answering