RAM 1500 bed size depends on the model year, body generation and cab configuration. Common nominal box lengths include 5'7" and 6'4", while selected previous-generation Regular Cab trucks were also offered with an 8' box.
Do not order a tonneau cover or bed mat using ‘RAM 1500’ and model year alone. First confirm whether the truck is a RAM 1500 Classic/DS or newer-body RAM 1500/DT, then check the cab, measured bed length, RamBox and tailgate configuration.
RAM 1500 Bed Size: Quick Answer
Official RAM specifications commonly describe the following box lengths:
| Nominal Bed Size | Published Floor Length | Approximate Metric Length | Common Configuration |
|---|---|---|---|
| 5'7" box | 67.4 inches | 1,711 mm | Commonly found with Crew Cab configurations |
| 6'4" box | 76.3 inches | 1,937 mm | Found with Quad Cab and selected Crew Cab configurations |
| 8' box | 98.3 inches | 2,497 mm | Available on selected previous-generation Regular Cab trucks |
The dimensions above are reference measurements found in official RAM specifications for specific model years and configurations. They should not be treated as proof that a particular accessory fits every RAM 1500 with the same nominal bed length.
Key Takeaways
- A nominal 5'7" bed is commonly listed at approximately 67.4 inches long at the floor with the tailgate closed.
- A nominal 6'4" bed is commonly listed at approximately 76.3 inches long.
- Selected previous-generation Regular Cab models were available with an approximately 98.3-inch 8' bed.
- Cab style helps narrow the possibilities, but it does not replace measuring the actual truck.
- RAM 1500 Classic/DS and newer-body RAM 1500/DT accessories should not be assumed interchangeable.
- RamBox and Multi-Function Tailgate equipment can affect accessory selection.
RAM 1500 Bed Dimensions
The following comparison uses published dimensions from the official 2018 RAM 1500 brochure and the official 2019 redesigned RAM 1500 brochure.
| Measurement | 5'7" Box | 6'4" Box | 8' Box |
|---|---|---|---|
| Nominal description | 5 feet 7 inches | 6 feet 4 inches | 8 feet |
| Length at floor, tailgate closed | 67.4 in | 76.3 in | 98.3 in on referenced previous-generation configuration |
| Cargo width, wall to wall | 66.4 in | 66.4 in | 66.4 in on referenced previous-generation configuration |
| Width between wheel housings | 51.0 in | 51.0 in | 51.0 in on referenced previous-generation configuration |
| Newer DT box depth | Approximately 21.4 in | Approximately 21.5 in | Not listed for the referenced DT configuration |
| Newer DT tailgate opening width | Approximately 60.0 in | Approximately 60.0 in | Not listed for the referenced DT configuration |
Measurement note: Published dimensions may be rounded, and model-year or equipment differences may exist. Measure the actual vehicle and follow the accessory manufacturer’s application information before ordering.
Sources:
RAM 1500 Bed Size by Cab Configuration
Cab style and bed length are related, but they are not the same specification. Do not assume that every Crew Cab, Quad Cab or Regular Cab has one universal bed size.
RAM 1500 Crew Cab Bed Size
RAM 1500 Crew Cab trucks are commonly found with:
- 5'7" box
- 6'4" box on selected configurations
The Crew Cab generally provides more rear-passenger space than the Quad Cab. Depending on the model year and configuration, the additional cab length may be paired with a shorter bed or a longer overall wheelbase.
RAM 1500 Quad Cab Bed Size
RAM 1500 Quad Cab configurations are commonly associated with the 6'4" box. The Quad Cab has smaller rear-door and rear-seat dimensions than the Crew Cab, but the exact configuration should still be confirmed from the truck and official model-year information.
For a detailed cab comparison, see the RAM 1500 Quad Cab vs Crew Cab guide.
RAM 1500 Regular Cab Bed Size
Selected previous-generation RAM 1500 Regular Cab trucks were offered with:
- 6'4" box
- 8' box
Regular Cab and 8' box availability varies by model year. Always verify the exact truck before selecting an accessory.
| Cab Style | Common Bed Options | Important Check |
|---|---|---|
| Crew Cab | 5'7" or selected 6'4" configurations | Measure the bed; do not assume every Crew Cab has a 5'7" box |
| Quad Cab | Commonly 6'4" | Confirm model year and body generation |
| Regular Cab | Selected 6'4" or 8' configurations | Check previous-generation availability and actual length |
Does DS or DT Affect RAM 1500 Bed Accessory Fitment?
Yes. A similar nominal bed length does not guarantee that an accessory designed for a RAM 1500 Classic/DS will fit a newer-body RAM 1500/DT.
Possible differences include:
- Bed-rail geometry
- Front bed-wall shape
- Tailgate shape
- Stake-pocket position
- Clamp location
- Accessory mounting clearance
- RamBox configuration
- Multi-Function Tailgate configuration
If the platform is uncertain, read the RAM 1500 DS vs DT identification guide before measuring or ordering.
How to Measure a RAM 1500 Truck Bed
Use a rigid or locking tape measure and record the result in both inches and feet. Measure more than once before selecting a bed accessory.
Tools Needed
- Tape measure long enough to span the bed
- Paper or mobile device for recording dimensions
- Flashlight for checking labels and rail details
- Second person if the tape cannot be held securely
Step 1: Close the Tailgate
Park the truck on a level surface and close the tailgate completely. Remove loose cargo that may interfere with the tape measure.
Step 2: Measure the Inside Floor Length
Measure from the inside face of the bulkhead—the wall directly behind the cab—to the inside face of the closed tailgate.
Keep the tape:
- Straight
- Level with the bed floor
- Centered or positioned where trim will not distort the reading
- Clear of cargo dividers and loose accessories
Step 3: Compare the Measurement With the Nominal Size
| Measured Length | Likely Nominal Description | Next Check |
|---|---|---|
| Approximately 67 inches | 5'7" box | Verify DS/DT, RamBox and accessory application |
| Approximately 76 inches | 6'4" box | Verify DS/DT, cab and accessory application |
| Approximately 98 inches | 8' box | Verify Regular Cab and model-year application |
A measurement does not need to equal the nominal name exactly. Manufacturers commonly round the description to 5'7", 6'4" or 8'.
Step 4: Check for RamBox
A RAM 1500 with RamBox has integrated storage compartments along the bed sides. RamBox can change the usable bed shape, rail design and accessory mounting requirements.
Do not order a standard-bed tonneau cover simply because the floor length matches. Confirm that the cover specifically supports the truck’s RamBox configuration.
See the RAM 1500 tonneau cover with RamBox fitment guide for additional checks.
Step 5: Check the Tailgate Configuration
Determine whether the truck uses a conventional tailgate or an available Multi-Function Tailgate. Some covers or mounting systems may have application exclusions related to tailgate equipment.
Step 6: Inspect Existing Bed Accessories
Record any equipment that may affect installation:
- Bed liner
- Bed-rail caps
- Cargo-management rails
- Toolbox
- Rack system
- Bed divider
- Aftermarket side rails
These items may occupy the same mounting area required by a tonneau cover or cargo system.
Nominal Bed Size vs Actual Measurement
The product name normally uses a rounded nominal dimension, while the actual bed floor may measure differently.
| Type of Measurement | Example | How It Is Used |
|---|---|---|
| Nominal size | 5'7" | Common product and vehicle description |
| Published floor length | 67.4 inches | Manufacturer specification for a defined configuration |
| Owner measurement | May vary slightly | Confirms which nominal category the truck likely uses |
| Accessory application | Year, model, body and bed-specific | Final basis for product selection |
Do not reject a 5'7" product because the bed measures approximately 67.4 inches. Conversely, do not assume every accessory labeled 5'7" fits every RAM 1500 with a bed in that measurement range.
Which Parts Depend on RAM 1500 Bed Size?
Tonneau Covers
Tonneau cover fitment may depend on:
- Model year
- RAM 1500 Classic/DS or RAM 1500 DT
- Bed length
- RamBox
- Multi-Function Tailgate
- Mounting-rail compatibility
Bed Mats
Bed mats may differ by:
- Bed length
- Bed-floor shape
- Wheel-housing contours
- RamBox or standard-bed design
- Model generation
Bed Liners
Drop-in liners require closer dimensional and contour matching than universal protective mats. Confirm all product exclusions.
Toolboxes and Cargo Systems
Measure the available width and rail area. RamBox, cargo rails, tonneau covers and existing racks may compete for the same installation space.
Truck Racks
A rack system may require specific stake pockets, rail clamps or tonneau-compatible brackets. Bed length is only one part of the fitment process.
RAM 1500 Bed Accessory Fitment Checklist
Complete this checklist before ordering:
- Model year
- RAM 1500 or RAM 1500 Classic
- DS or DT body
- Crew Cab, Quad Cab or Regular Cab
- Measured inside bed-floor length
- 5'7", 6'4" or 8' nominal box
- RamBox or standard bed
- Conventional or Multi-Function Tailgate
- Bed liner or rail caps
- Cargo rails, toolbox or rack
- Product-specific exclusions
Common RAM 1500 Bed Measurement Mistakes
Measuring the Outside of the Bed
Tonneau cover sizing normally uses the usable bed area, not the truck’s outside body length.
Measuring With the Tailgate Open
Use the inside face of the closed tailgate unless the product manufacturer provides a different instruction.
Rounding Before Recording the Measurement
Record the actual measurement first. Convert it to the nominal description afterward.
Assuming Every Crew Cab Has a 5'7" Bed
Selected Crew Cab configurations are available with a 6'4" box. Measure the vehicle.
Ignoring DS and DT
Two trucks with similar bed lengths may belong to different body generations and require different accessories.
Ignoring RamBox
A standard-bed cover should not be assumed to fit a RamBox truck.
Using Bed Length as the Only Fitment Field
Bed length identifies the general size category. It does not confirm the rail, tailgate or mounting configuration.
Frequently Asked Questions
Q: What bed sizes are available on a RAM 1500?
A: Common RAM 1500 box descriptions include 5'7" and 6'4". Selected previous-generation Regular Cab trucks were also available with an 8' box. Availability varies by generation, model year and cab configuration.
Q: How long is a RAM 1500 5'7" bed?
A: Official specifications for referenced configurations list a floor length of approximately 67.4 inches with the tailgate closed. The 5'7" description is a rounded nominal size.
Q: How long is a RAM 1500 6'4" bed?
A: Official RAM specifications commonly list the 6'4" box at approximately 76.3 inches long at the floor with the tailgate closed.
Q: How wide is a RAM 1500 bed?
A: The referenced official specifications list approximately 66.4 inches of cargo width and approximately 51.0 inches between the wheel housings. Verify the relevant model year and configuration before using these figures for fabrication or accessory installation.
Q: Does every RAM 1500 Crew Cab have a 5'7" bed?
A: No. Crew Cab trucks are commonly found with a 5'7" box, but selected configurations use a 6'4" box. Measure the actual bed before ordering.
Q: Does a RAM 1500 Quad Cab have a 6'4" bed?
A: The 6'4" box is a common Quad Cab configuration. Confirm the model year, body generation and actual measurement because product fitment should not be based on cab name alone.
Q: Will a RAM 1500 Classic bed cover fit a New Body RAM 1500?
A: Do not assume it will. RAM 1500 Classic/DS and newer-body RAM 1500/DT trucks may use different bed geometry or mounting details. Follow the cover manufacturer’s exact application.
Q: Does RamBox require a different tonneau cover?
A: A RamBox truck may require a cover and mounting system specifically designed for its integrated storage and bed rails. Confirm that the product explicitly supports RamBox.
Q: Can I determine bed size from the VIN?
A: A VIN decoder or build record may provide useful configuration information, but it may not supply every accessory-fitment detail. Confirm the result by measuring the bed and inspecting RamBox, tailgate and rail equipment.
Q: Why does my bed measurement not exactly equal 5'7" or 6'4"?
A: Those are nominal product descriptions. Published floor lengths are commonly approximately 67.4 inches and 76.3 inches for the corresponding configurations.
Measure First, Then Confirm Fitment
A correct bed-length measurement narrows the product selection, but it does not complete the fitment process. Confirm the model year, DS or DT body, cab, RamBox, tailgate and mounting requirements before ordering a tonneau cover, bed mat or cargo accessory.
If any detail is uncertain, send BDFHYK the model year, full vehicle name, VIN, measured bed length and clear photos of the bed rails and tailgate for a fitment review.
