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Quick Answer: Standard semi truck sleeper berth mattresses range from 32 x 79 inches to 42 x 80 inches depending on make and model. According to the Canadian Centre for Occupational Health and Safety, proper sleep surface dimensions directly impact rest quality and fatigue recovery for commercial drivers.
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If you are shopping for a new truck mattress, the first thing you need to know is what size fits your sleeper cab. It sounds simple enough, but truck mattress sizes are not standardized the way household mattresses are. A Freightliner Cascadia and a Peterbilt 389 take different dimensions, and even the same model can vary depending on the year, trim level, and options package.
We have built thousands of custom truck mattresses at Mattress Miracle, and the most common question we hear is: "What size mattress fits my truck?" This guide covers every major make and model so you can find the right starting point, then we will walk you through how to measure your actual berth to make sure you get a perfect fit.
Standard Sleeper Cab Mattress Sizes
Unlike residential mattresses that follow standard Twin, Full, Queen, and King dimensions, truck mattresses come in sizes unique to the trucking industry. Here are the four most common sleeper cab mattress sizes you will encounter:
| Common Name | Dimensions (inches) | Dimensions (cm) | Typical Use |
|---|---|---|---|
| Narrow Berth | 32 x 79 | 81 x 201 | Older model day cabs with sleeper option |
| Standard Single | 35 x 79 | 89 x 201 | Standard single-berth sleeper cabs |
| Mid-Size | 36 x 80 | 91 x 203 | Most common size across all manufacturers |
| Full Berth | 38 x 80 | 97 x 203 | Mid-roof and some flat-roof sleepers |
| Wide Berth | 42 x 80 | 107 x 203 | Upper berth in double-bunk configurations, premium sleepers |
The 36 x 80 inch size is the most common across the industry. If you had to guess and could not measure, that would be the safest starting point for most modern sleeper cabs. However, we always recommend measuring your actual berth before ordering. More on that below.
As Transport Canada regulations require minimum rest periods for commercial drivers, having a properly fitted sleep surface is not just about comfort. It is about safety and compliance with hours-of-service rules that keep our roads safer for everyone.
Mattress Sizes by Truck Make and Model
Here is the comprehensive size chart covering every major truck manufacturer and their popular models. We have compiled this from years of building mattresses for these specific trucks, combined with manufacturer specifications.
Important note: These dimensions are approximate and based on the most common configurations. Your specific truck may differ depending on the model year, factory options, and any aftermarket modifications. Always measure your actual sleeper berth before ordering.
Freightliner
| Model | Berth Position | Mattress Size (inches) | Notes |
|---|---|---|---|
| Cascadia | Upper Berth | 42 x 80 | Most common in 72" and 82" raised roof sleepers |
| Cascadia | Lower Berth | 36 x 80 | Standard in double-bunk configurations |
| Century | Single Berth | 36 x 80 | Standard across most model years |
| Columbia | Single Berth | 36 x 80 | Check corner radius on older models |
Peterbilt
| Model | Berth Position | Mattress Size (inches) | Notes |
|---|---|---|---|
| 579 | Upper Berth | 42 x 80 | UltraLoft 80" sleeper configuration |
| 579 | Lower Berth | 36 x 80 | Standard double-bunk setup |
| 389 | Upper Berth | 42 x 80 | 70" flat-top sleeper |
| 389 | Lower Berth | 35 x 79 | Some configurations have slightly narrower berths |
| 567 | Single Berth | 36 x 80 | Standard mid-roof sleeper |
Kenworth
| Model | Berth Position | Mattress Size (inches) | Notes |
|---|---|---|---|
| T680 | Upper Berth | 42 x 80 | 76" raised roof sleeper |
| T680 | Lower Berth | 36 x 80 | Double-bunk configuration |
| W900 | Upper Berth | 42 x 80 | Studio sleeper and AeroCab options |
| W900 | Lower Berth | 35 x 79 | Varies by sleeper package |
| T880 | Single Berth | 36 x 80 | Standard 40" flat-top sleeper |
Volvo
| Model | Berth Position | Mattress Size (inches) | Notes |
|---|---|---|---|
| VNL 760 | Upper Berth | 42 x 80 | 61" raised roof, generous sleeping area |
| VNL 860 | Upper Berth | 42 x 80 | 70" raised roof, largest Volvo sleeper |
| VNR | Single Berth | 35 x 79 | Regional haul configuration |
International
| Model | Berth Position | Mattress Size (inches) | Notes |
|---|---|---|---|
| LT | Upper Berth | 42 x 80 | 73" raised roof Hi-Rise sleeper |
| LT | Lower Berth | 36 x 80 | Standard double-bunk setup |
| Lonestar | Single Berth | 36 x 80 | 56" raised roof sleeper |
Mack
| Model | Berth Position | Mattress Size (inches) | Notes |
|---|---|---|---|
| Anthem | Upper Berth | 42 x 80 | 70" stand-up sleeper |
| Anthem | Lower Berth | 36 x 80 | Double-bunk configuration |
| Pinnacle | Single Berth | 36 x 80 | Standard across most configurations |
Western Star
| Model | Berth Position | Mattress Size (inches) | Notes |
|---|---|---|---|
| 5700XE | Upper Berth | 42 x 80 | Stratosphere sleeper option |
| 4900 | Single Berth | 36 x 80 | Standard sleeper configuration |
Many drivers tell us they are surprised when they measure and find their berth is slightly different from what is listed here. That is completely normal. Year-to-year changes, factory options, and even dealer modifications can affect the final sleeping area dimensions.
How to Measure Your Sleeper Berth
Even with the size chart above, we strongly recommend measuring your actual sleeper berth before ordering a new mattress. Here is how to do it properly:
Step 1: Remove the old mattress. Take the existing mattress completely out of the berth. You want to measure the sleeping platform itself, not the old mattress.
Step 2: Measure the width. Measure from the inside wall to the inside edge of the berth at both the head end and the foot end. Sleeper berths are not always perfectly rectangular, so note if there is any difference.
Step 3: Measure the length. Measure from head to foot along both the wall side and the open side. Again, note any differences.
Step 4: Check for corner cuts. Many sleeper berths have angled or rounded corners, especially at the foot end near the cab wall. If your berth has corner cuts, measure the angle. This is critical for getting a proper fit.
Step 5: Measure the depth. Measure from the sleeping platform to any overhead obstruction like the upper bunk, reading light, or ceiling panel. This tells you the maximum mattress thickness that will work.
Step 6: Note any obstructions. Check for HVAC vents, wiring, or other hardware that might affect mattress placement.
When you send us your measurements, include all of these details plus your truck make, model, year, and sleeper package type. We will confirm the right size before we start building.
What Mattress Thickness Works in a Sleeper Cab
Mattress thickness (also called profile height) matters a lot in a sleeper cab because you are working with limited vertical space. Here is a breakdown of the common thickness options and what works best:
| Thickness | Best For | Considerations |
|---|---|---|
| 5 to 6 inches | Upper bunks, drivers under 180 lbs | Minimal support for heavier drivers, common in factory mattresses |
| 7 inches | Most drivers, good balance of comfort and clearance | Our custom and budget builds use this profile |
| 8 inches | Drivers wanting extra comfort with adequate clearance | Check overhead clearance before ordering |
| 9 inches | Lower berths, drivers wanting maximum support | Our full build profile, best for drivers over 200 lbs |
In our experience, the sweet spot for most truck drivers is between 7 and 9 inches. Our custom and budget builds come in at roughly 7 inches, which fits comfortably in virtually every sleeper cab on the market. Our full build mattresses are 9 inches, offering premium support that works well in lower berths and single-bunk configurations where overhead clearance is not an issue.
Factory truck mattresses are typically 4 to 5 inches thick, which is one of the biggest reasons drivers complain about sleeping in their trucks. That thin profile simply does not provide enough support for a good night of rest, especially for drivers who spend 200 or more nights a year in their cab.
Research published in the Journal of Clinical Sleep Medicine has shown that sleep surface quality directly affects sleep efficiency and next-day alertness. For commercial drivers, this is not just about comfort. It is about safety on the road.
Why Foam Density Matters More Than Size
Once you have the right size sorted out, the next thing that makes the biggest difference in your sleep quality is foam density. This is something most truck mattress shoppers overlook, and it is arguably more important than getting the dimensions exactly right.
Here is what you need to know: most factory truck mattresses use foam with a density of 1.2 to 1.5 lb/ft3. That is the cheapest foam available, and it breaks down fast. Within six months of regular use, you are sleeping in a hammock-shaped impression that gets worse every night.
Upgrading to foam in the 1.7 to 1.9 lb/ft3 density range makes a massive difference in both comfort and longevity. According to the Sleep Foundation, low-density foam loses up to five times more height over its lifespan compared to higher-density alternatives. That means your 5-inch factory mattress might feel like a 3-inch mattress after a year of use.
We think density is the single most important factor in a truck mattress purchase. A properly dense foam mattress in the right size will outperform a premium household mattress that has been cut down to fit a sleeper cab. The foam is designed differently, and it matters.
For a deeper dive into foam density and what it means for fleet operations, check out our Fleet Truck Mattress Foam Density Guide. It covers everything from cost-per-night calculations to how density affects driver retention.
Custom Size Truck Mattresses
Not every sleeper cab fits neatly into the standard sizes listed above. Older trucks, specialty vehicles, RV conversions, and modified sleepers often need mattresses in non-standard dimensions. That is exactly what we do at Mattress Miracle.
We build custom size truck mattresses for any cab configuration, including:
- Non-standard widths and lengths
- Corner cuts and angled edges to match your berth shape
- Tapered designs for sleepers that are wider at one end
- Split mattresses for berths with a centre hinge or fold
- Extra-thick builds for drivers who want maximum support
- Thin-profile builds for tight upper bunks
Every mattress we build starts with your specific measurements. We do not stock pre-made sizes and trim them down. Each one is built from scratch to your exact dimensions, using the foam density and thickness profile you choose.
The Canadian Centre for Occupational Health and Safety notes that fatigue is one of the leading risk factors for commercial vehicle incidents. A mattress that actually fits your berth and supports your body properly is one of the most practical investments a driver can make.
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Not sure what size fits your cab?
Contact us with your truck make and model and we will confirm the right dimensions and build you a custom mattress.
Email info@mattressmiracle.ca or call 519-770-0001.
Get Your Custom SizeFrequently Asked Questions
What size mattress fits a Freightliner Cascadia?
The Freightliner Cascadia typically takes a 42 x 80 inch mattress for the upper berth and a 36 x 80 inch mattress for the lower berth. This applies to both the 72-inch and 82-inch raised roof sleeper configurations. However, we always recommend measuring your specific berth as dimensions can vary by model year and factory options.
What is the standard semi truck mattress size?
The most common semi truck mattress size is 36 x 80 inches. This fits the majority of single-berth sleeper cabs across all major manufacturers. Other common sizes include 35 x 79 inches for standard single berths, 42 x 80 inches for upper bunks and premium sleepers, and 32 x 79 inches for older narrow berths.
Can I use a regular mattress in my truck?
We do not recommend it. Regular household mattresses are not designed for the dimensions or conditions of a sleeper cab. A standard Twin mattress is 38 x 75 inches, which is too short for most sleeper berths. More importantly, household mattresses are not built to handle the vibration, temperature swings, and humidity conditions inside a truck cab. A purpose-built truck mattress will last longer and perform better.
What thickness mattress works in a sleeper cab?
For most sleeper cabs, a 7 to 9 inch mattress works well. Our custom and budget builds are roughly 7 inches, which fits in virtually every cab. Our full builds are 9 inches and work best in lower berths and single-bunk setups with good overhead clearance. Factory mattresses are typically only 4 to 5 inches, which is too thin for proper support during extended use.
Do you make custom size truck mattresses?
Yes, every mattress we build at Mattress Miracle is made to order with your exact measurements. We handle non-standard widths and lengths, corner cuts, angled edges, tapered designs, and split mattresses. Send us your measurements along with your truck make, model, and year, and we will confirm the right specifications before building.
How do I measure my sleeper berth for a new mattress?
Remove the old mattress first, then measure the sleeping platform width at both the head and foot ends, the length along both the wall and open sides, and any corner angles or cuts. Also measure the vertical clearance from the platform to any overhead obstruction. Note your truck make, model, year, and sleeper package, then contact us with all of these details for a size confirmation.
Medical Disclaimer: The health and safety information in this article is provided for general educational purposes only. It is not intended as medical advice. If you are experiencing sleep disorders, chronic fatigue, or other health concerns related to your work as a commercial driver, please consult a qualified healthcare professional. Mattress selection can support better sleep, but it is not a substitute for professional medical guidance.