When you're living life on the open road, good sleep isn't just a luxury, it's mission critical. For truck drivers, a comfortable, properly sized mattress can mean the difference between a safe, alert shift and a fatigued, dangerous haul. But when it comes to what size mattress fits in a semi truck, the answer isn’t always simple.
Unlike standard home beds, semi-truck mattresses come in a range of specific sizes designed to fit the sleeper berths of various makes and models. A mismatch between mattress size and sleeper cab space can lead to poor sleep quality, cramped quarters, and even costly replacements.
In this guide, we’ll break down common semi-truck mattress sizes, how to choose the perfect fit, and tips for upgrading your truck bed for maximum comfort on the road. Whether you drive a Peterbilt 579, a Kenworth T680, or a Freightliner Cascadia, we’ll help you find the right mattress for your rig and your body, because better sleep means better hauls.
What Size Mattress is in a Semi Truck?
So, what size mattress is in a semi truck?
The answer: It depends on your truck's make, model, and sleeper configuration, but most semi-truck mattresses fall between 32" to 42" wide and 75" to 80" long.
Here are some common dimensions you’ll find across sleeper cabs:
- 32" x 79" - Popular for compact sleeper cabs
- 36" x 76" - Slightly wider for mid-sized sleeper berths
- 36" x 80" - A standard semi-truck mattress size offering extra legroom
- 38" x 80" - Often found in larger sleeper cabs like Peterbilts and Freightliners
- 42" x 80" - Maximum width for extra sleeping space
There’s no truly "standard" size across all semi-trucks. Different truck models, like a Peterbilt 389, Kenworth T680, or Freightliner Cascadia, are built with specific mattress spaces in mind. Even within the same model line, sleeper berth sizes can vary depending on whether it’s a mid-roof, high-roof, or ultra-sleeper design.
Key takeaway:
Before buying a replacement mattress, always measure your sleeper space, don’t assume a one-size-fits-all solution.
A mattress that’s even a few inches too short or too wide can cause major comfort (and fitting) problems.
Common Semi-Truck Mattress Sizes
When it comes to finding the right semi truck mattress size, knowing the most common dimensions makes the search much easier. Manufacturers like Peterbilt, Kenworth, Freightliner, and Volvo typically design their sleeper berths around a few industry-standard mattress sizes.
Here’s a quick truck mattress size chart for easy reference:
|
Mattress Size (Inches) |
Common Application |
Notes |
|
32" x 79" |
Compact sleeper cabs, tight spaces |
Ideal for smaller sleepers and single drivers |
|
36" x 75" |
Mid-size sleepers |
Slightly shorter length |
|
36" x 80" |
Standard semi-truck mattress |
Great balance of width and length |
|
38" x 80" |
Larger sleeper cabs (e.g., Peterbilt 379) |
Extra width for added comfort |
|
39" x 80" |
Standard size sold by FleetsWorld |
MI3980 spring mattress for maximum support |
|
42" x 80" |
Extra-wide sleeper berths |
Best for maximum space and larger drivers |
Popular Semi-Truck Mattress Sizes by Truck Brand
- Peterbilt 379, 389, 579: Common mattress sizes are 36" x 80", 38" x 80", or 42" x 80".
- Kenworth T680: Typically fits a 38" x 80" mattress.
- Freightliner Cascadia: Commonly uses 38" x 80" or 42" x 80" mattresses.
- Volvo VNL 760: Often equipped with a 39" x 80" mattress.
- Western Star models: Vary between 36" and 42" widths depending on sleeper cab design.
Important note:
Even within the same model, sleeper berth upgrades (like a Unibilt UltraSleeper or a high-roof sleeper) can change the mattress size needed. Always double-check your sleeper berth dimensions before ordering!
Semi-Truck Mattress Sizes by Truck Model
Not all rigs are built the same, and neither are their sleeper berths. Here's a closer look at semi truck mattress sizes for popular models across the road today:
Peterbilt Mattress Sizes
- Peterbilt 379: Typically fits a 36" x 80" or 38" x 80" mattress.
- Peterbilt 389: Common mattress size is 42" x 80" for extra sleeping space.
- Peterbilt 579: Most models require a 38" x 80" mattress; larger sleepers might fit 42" x 80".
Tip: Peterbilt's Unibilt Sleepers often have more width and height, offering more flexibility for mattress upgrades.
Kenworth Mattress Sizes
- Kenworth T680: Standard mattress size is 38" x 80".
- Kenworth W900: Depending on sleeper cab, typically 36" x 80" or 38" x 80".
Pro Insight: Kenworth’s larger sleepers provide good space for memory foam upgrades without sacrificing comfort.
Freightliner Mattress Sizes
- Freightliner Cascadia: Generally fits a 38" x 80" or 42" x 80" mattress.
- Freightliner Columbia: Often uses a 36" x 80" mattress.
Fact: Freightliner beds tend to run a little wider — a big plus for combination sleepers who move around at night.
Volvo Mattress Sizes
- Volvo VNL 760: Most sleepers use a 39" x 80" mattress (slightly wider than standard).
- Volvo VNL 860: Typically fits a 42" x 80" mattress for a roomy experience.
Driver Favorite: Volvo’s larger mattress spaces make them ideal candidates for thicker memory foam mattresses (10"+ thickness).
International Truck Mattress Sizes
- International LT Series: Common mattress size is 38" x 80".
- International 9900i 72" Sleeper: Fits a 42" x 80" mattress, one of the largest standard bunk sizes available.
Bottom line:
Semi-truck mattress sizes depend heavily on the model, sleeper cab design, and any customizations made by the fleet or driver. Always measure your bunk space — don’t just rely on model guesses!
Factors to Consider When Choosing a Semi-Truck Mattress
Finding the right semi-truck mattress isn’t just about nailing the size — it’s also about making sure it supports your body, matches your sleeping style, and fits the demands of life on the road. Here's what every driver should keep in mind:
1. Sleeper Berth Space
Use a measuring tape and note the widest and narrowest points. Sleeper berths aren't always perfectly rectangular, some taper slightly.
2. Body Type and Sleeping Style
Heavier drivers may prefer firmer or thicker mattresses to prevent sagging. Lightweight drivers often do better with softer, more contouring options.
3. Mattress Construction
Memory foam offers pressure relief and motion isolation, while spring mattresses (like the MI3980) deliver familiar support and durability.
4. Mattress Firmness
A medium-firm mattress often works best for combination sleepers
5. Breathability and Moisture Control
Spring-core mattresses with quilted covers (like the MI3980) help prevent trapped moisture and promote ventilation.
6. Warranty and Sleep Trial
FleetsWorld’s MI3980 mattress comes with a 1-year or 100,000-mile warranty, giving buyers peace of mind.
Types of Mattresses Available for Semi-Trucks
Not every driver sleeps the same way, and not every truck mattress is built alike. Choosing the right type of semi-truck mattress can make all the difference between restless nights and refreshing sleep.
Spring Mattresses
Durable, flippable, supportive - and the go-to for many fleets.
Memory Foam and Foam-Core Mattresses
Good for pressure relief and motion isolation, though not currently listed in the FW catalog.
Note: Only promote types that match FleetsWorld’s actual inventory to stay aligned with product availability.
Tips for Buying the Right Semi-Truck Mattress
- Measure twice - sleeper specs can vary.
- Match to body type - heavier drivers often need firmer, supportive builds.
- Invest in a quality brand-backed product - like FleetsWorld’s product range.
Frequently Asked Questions
Can a Twin Size Mattress Fit in a Semi Truck?
A standard Twin (38" x 75") may be close in width but usually falls short in length and may not align with cab dimensions.
What Size Mattress Is in a Kenworth T680?
Most Kenworth T680 sleeper cabs use a 38" x 80" mattress.
What Size Bed Sheets Are Needed for a Semi Truck?
Look for sheets made specifically for truck mattresses, like 39" x 80" or 36" x 80" options.
What Size Mattress Fits in a Peterbilt 579?
A 38" x 80" or 42" x 80" mattress fits most Peterbilt 579 models.