What Size Is a Semi Truck Mattress? Dimensions, Types, and How to Measure

If you’re asking “What size is a semi truck mattress?”, you’re usually trying to figure out whether a replacement mattress will fit in your sleeper cab, or how semi truck sizes compare to standard home mattress sizes. This guide explains common semi truck mattress dimensions, how they relate to regular bed sizes, and how to measure your sleeper bunk correctly.

What Size Is a Semi Truck Mattress, Exactly?

There is no single standard size for all semi truck mattresses, but most fall into a few common ranges.

Typical semi truck mattress dimensions are:

Many semi truck mattresses are about 75–80 inches long, similar to a home twin or full mattress. The width is where truck mattresses vary most and are often narrower than home mattresses to fit the cab.

How Do Semi Truck Mattress Sizes Compare to Home Mattress Sizes?

Semi truck mattresses are often described using familiar terms like twin, full, or bunk, but they rarely match those home sizes exactly.

Common comparisons:

• A truck “twin” might be around 36" x 80", narrower than a home twin (typically 38" x 75").
• Some wider truck mattresses are 42–48" wide, which is less than or close to a home full (typically 54" wide).
• Lengths of 75–80" are common, similar to twin XL or queen length in homes.

Because of these differences, measuring your sleeper bunk is more reliable than comparing names like “twin” or “full.”

Why Does Semi Truck Mattress Size Matter?

Choosing the right size semi truck mattress affects:

• Fit and safety – A mattress that’s too big may bunch up, block access, or press against walls and vents; one that’s too small can slide around.
• Comfort – Proper dimensions help you stretch out without hanging over the edges.
• Bedding compatibility – Knowing the size helps you choose sheets and mattress protectors that stay in place.
• Storage and layout – In smaller cabs, every inch matters for storage compartments and movement.

For anyone spending many nights on the road, getting the correct size is one of the most important steps toward a more comfortable sleeper.

How Do I Measure for a Semi Truck Mattress?

Step-by-step measuring tips

To know what size a semi truck mattress you need:

1. Clear the bunk
   Remove the existing mattress and any pads or toppers.

2. Measure the length
   Measure from the head wall to the foot wall of the sleeper platform.

   • Record to the nearest half inch.
   • If there are curves or cutouts, measure the longest usable length.

3. Measure the width
   Measure side-to-side at the widest point of the platform.

   • Some bunks narrow slightly at the corners; note if the width changes.

4. Check the height (thickness)
   While thickness doesn’t change the footprint, very thick mattresses can:

   • Reduce headroom
   • Interfere with cabinets or windows
   • Make climbing in and out harder

5. Note any special shapes
   Some semi truck mattresses have:

   • Rounded corners
   • Cut corners
   • Notches to clear posts or fixtures

   If your bunk isn’t a perfect rectangle, this is important to record.

📝 Tip: Write measurements as Width x Length x Thickness (for example, 36" x 80" x 6") and keep them handy when comparing options.

Are Semi Truck Mattresses All the Same Across Models?

No. Different truck models and years can use different mattress sizes. Even within the same brand or model line, there can be:

• Short vs. extended sleepers
• Single vs. double bunks
• Different interior layouts

Because of this, relying on the truck model name alone can lead to confusion. Direct measurements of your sleeper bunk are the most accurate way to determine what size semi truck mattress you need.

What Should I Consider Besides Size?

Once you know what size a semi truck mattress your cab requires, you might also want to think about:

• Thickness: Thicker isn’t always better if it reduces headroom or makes it hard to sit up.
• Weight: Heavier mattresses can be harder to move when accessing storage under the bunk.
• Edge support: Helpful on narrow bunk sizes, where you use the full width of the mattress.
• Bedding fit: Fitted sheets may need to be sized for truck mattresses or adjusted from standard sizes.

These factors don’t change the size itself, but they influence how well the mattress works in the space you have.

✔️ Quick Mattress Takeaways

Key points consumers should understand about “What Size Is a Semi Truck Mattress”:

• There is no single standard size for semi truck mattresses; dimensions vary by truck model and sleeper design.
• Most semi truck mattresses are around 75–80 inches long, with widths commonly between 28 and 48 inches.
• Terms like “twin” or “full” for truck mattresses are approximate, not identical to home mattress sizes.
• To find the right size, measure your bunk platform: width, length, and note any rounded or cut corners.
• Mattress thickness and shape also matter, especially in compact cabs with limited headroom or storage.
• Always match your bedding and protectors to the actual measured size, not just the label name.

With a clear understanding of what size a semi truck mattress typically is and how to measure your own sleeper, you can choose a mattress that fits your cab, supports your body, and works well with your truck’s layout.