How wide is a Ram 1500 bed between the wheel wells?

51.0 inches on a non-RamBox bed, per Ram's published specifications, with a maximum cargo width of 66.4 in. That is the widest of the four trucks this site covers. A RamBox bed is narrower, because the in-wall boxes take interior space.

What are the Ram 1500 bed dimensions with RamBox?

Narrower than the non-RamBox figures, because the storage boxes occupy space inside the bed walls, and with an interrupted rail profile because the lids sit in the rail line. Parts are listed as RamBox or non-RamBox and are not interchangeable — filter on that first.

How long is the Ram 1500 5'7 bed at the floor?

67.4 inches, with 53.8 cu ft of cargo volume and 21.4 in of depth. The 6'4" bed is 76.3 in at the floor, 61.5 cu ft and 21.5 in deep.

What is the Ram 1500's bed rail width?

UWS publishes the exterior bed rail width — outside to outside across the rail tops — as about 66 inches, the widest of the four trucks here. That is the figure crossover tool box fitment is built around.

Does a Ram 1500 Classic have different bed dimensions?

Close enough that dimensions are not what distinguishes them, which is the trap. The new body style and the Classic take different covers, liners and some racks because of the rail and body profile. Check the badging before ordering.

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Ram 1500 bed dimensions

Every published figure in one table, cited — and an honest account of what RamBox does to them.

By Mike M.Updated October 2026

DECKED Drawer System — Ram 1500/2500/3500, 6'6" bed (Classic) — Ram 1500 bed dimensions — Featured here: the DECKED DECKED Drawer System — Ram 1500/2500/3500, 6'6" bed (Classic).

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How we know:Spec-verifiedOwner-report-verifiedWhat these mean

Ram 1500 published cargo box dimensions, non-RamBox. Exterior rail width from UWS's bed width guide.
	5'7" bed	6'4" bed
Length at floor	67.4 in	76.3 in
Width between wheelhouses	51.0 in	51.0 in
Maximum cargo width	66.4 in	66.4 in
Cargo box depth	21.4 in	21.5 in
Cargo volume	53.8 cu ft	61.5 cu ft
Exterior bed rail width	about 66 in	about 66 in

Which number matters for which product

Exterior bed rail width (about 66 in). The crossover tool box figure, and the widest of the four trucks here. See what size tool box fits a Ram 1500.
Width between wheelhouses (51.0 in). Chests, drawer modules and slides. The most generous figure of these four trucks.
Maximum cargo width (66.4 in). The widest interior point, which is what a cargo bar spans. A 44-74 in bar is the right range.
Length at floor. Drawer systems and slides, exactly. 67.4 in and 76.3 in are the numbers to order against.

What RamBox changes

RamBox is a pair of lockable storage boxes built into the bed walls. The figures above are for a bed without it. With RamBox fitted, two things change and both matter for accessory fitment.

Usable interior width is reduced. The boxes occupy space inside the walls, so the maximum cargo width is narrower than the non-RamBox figure.
The rail profile is interrupted. The box lids sit in the rail line, which changes what a tonneau cover seals to and what a tool box clamp has to grip.
Parts are listed separately. “RamBox” and “no RamBox” are two different fitments across covers, liners, drawer systems and racks. They are not interchangeable and a non-RamBox part on a RamBox bed will not fit.

The 2019 Classic split

From 2019, Ram sold the new-body-style 1500 and the previous-generation Classic alongside each other, exactly as Chevrolet did with the Silverado. They take different covers, liners and some racks. Check the tailgate badging and your VIN.

The measurement to take yourself

Measure the exterior bed rail width outside-to-outside across the top of the rails nearest the cab, tape taut. Measure the wheelhouse width with whatever liner is actually in the bed — a drop-in liner costs you most of an inch each side, which on a 51.0 inch span is still comfortable for a 48 inch slide but worth knowing.

Gear sized to these dimensions

DECKEDSpec-verified

DECKED Drawer System — Ram 1500/2500/3500, 6'6" bed (Classic)

Best for: Ram beds, including the 6'6" classic

Our score8.8/10

$1,699.99at Amazon

Price as of October 5, 2026. #ad

The Ram fitment. Worth calling out because Ram's RamBox option changes the usable bed width, and a drawer system that does not account for it will not drop in — check which bed you have before ordering.

Who should skip it. Not compatible with a RamBox bed. That is a genuinely different bed, not a trim difference.

Build: 9.4
Capacity: 8.4
Install: 8.6
Day-to-day access: 9.8
Value: 7.0

What works

Covers the long-serving Ram 6'6" bed
Same sealed-drawer design as the rest of the range
Fits the heavy-duty Ram beds as well as the 1500

What does not

Not for RamBox beds
Premium price
Heavy

Published specifications

Fitment: Ram 1500/2500/3500, 6'6" bed, Classic Edition
Drawers: 2 full-length
Install: No drilling
Published capacity: Not published

Figures from the Manufacturer listing.

Fits

Ram 1500, 2500 and 3500 with the 6'6" bed, Classic Edition

Does not fit

RamBox-equipped beds
5'7" Ram beds — separate listing

WeatherTechSpec-verified

WeatherTech FloorLiner — Ram 1500, 1st and 2nd Row

Best for: The deepest tray and the best edge

Our score8.8/10

$241.90at Amazon

Price as of October 5, 2026. #ad

Laser-measured, high-wall liners for the Ram 1500 in a first and second row set. The reason WeatherTech still wins is the wall height at the door sill — that edge is what stops meltwater running onto the carpet instead of into the tray.

Who should skip it. They are the most expensive liners you can buy and the hard surface is noisier underfoot than a softer TPE mat.

Material: 9.2
Fit: 9.6
Cleanability: 9.4
Comfort: 7.4
Value: 7.0

What works

Highest sill walls in the category — water stays in the tray
Laser-measured fit around every bracket and bolt
Hoses out and goes straight back in
Holds resale value and transfers to a buyer

What does not

Most expensive option
Harder and noisier underfoot than TPE
Fitment is specific — confirm cab and year

Published specifications

Fitment: Ram 1500 — first and second row
Type: Laser-measured high-wall FloorLiner
Part numbers: 4418771 / 441421
Material: Not published

Figures from the Manufacturer listing.

Fits

Ram 1500 in the listed application — verify cab and model year

Does not fit

Other trucks
Anyone wanting a soft underfoot feel

GatorOwner-report-verified

Gator Soft Roll-Up with Gear Straps — Ram 1500 (2019-2026)

Best for: Budget roll-up for a Ram

Our score7.8/10

$219.99at Amazon

Price as of October 5, 2026. #ad

A vinyl roll-up with gear straps for the new-body Ram 1500 at a budget price. The straps matter more than they sound: they are what stops the rolled bundle flapping at highway speed.

Who should skip it. Low-profile flush fit means the rails have to be straight and undamaged. On a bed with a dented rail you will chase leaks.

Protection: 7.0
Weather seal: 7.0
Install: 9.4
Durability: 6.8
Value: 9.2

What works

Cheap
Gear straps keep the roll secure at speed
Low-profile flush mount looks factory

What does not

Vinyl durability
Needs straight rails to seal
No load capacity

Published specifications

Fitment: Ram 1500 2019-2026, new body style
Type: Soft roll-up with gear straps
Part number: 138693
Published load rating: Not published

Figures from the Manufacturer listing.

Fits

Ram 1500, 2019-2026, new body style

Does not fit

Ram 1500 Classic (2019-2024) — separate listing
RamBox beds

Questions people actually ask

How wide is a Ram 1500 bed between the wheel wells?: 51.0 inches on a non-RamBox bed, per Ram's published specifications, with a maximum cargo width of 66.4 in. That is the widest of the four trucks this site covers. A RamBox bed is narrower, because the in-wall boxes take interior space.
What are the Ram 1500 bed dimensions with RamBox?: Narrower than the non-RamBox figures, because the storage boxes occupy space inside the bed walls, and with an interrupted rail profile because the lids sit in the rail line. Parts are listed as RamBox or non-RamBox and are not interchangeable — filter on that first.
How long is the Ram 1500 5'7 bed at the floor?: 67.4 inches, with 53.8 cu ft of cargo volume and 21.4 in of depth. The 6'4" bed is 76.3 in at the floor, 61.5 cu ft and 21.5 in deep.
What is the Ram 1500's bed rail width?: UWS publishes the exterior bed rail width — outside to outside across the rail tops — as about 66 inches, the widest of the four trucks here. That is the figure crossover tool box fitment is built around.
Does a Ram 1500 Classic have different bed dimensions?: Close enough that dimensions are not what distinguishes them, which is the trap. The new body style and the Classic take different covers, liners and some racks because of the rail and body profile. Check the badging before ordering.

Sources

Ram 1500 accessories: what fits and what does not
Published Ram 1500 bed dimensions, the tool box size that fits, and the RamBox distinction that decides half the parts list.
What size tool box fits a Ram 1500?
The measurement, the size class, and the RamBox check that comes before either of them.
Truck bed dimensions chart
Exterior rail width, wheel-well width, bed length, depth and volume for all four trucks, cited to the manufacturer.
How to measure a truck bed for a tool box
The four measurements in order, what each one decides, and why the box is longer than your bed is wide.
The best tool boxes for a Ram 1500
Crossover, chest and topsider boxes for the Ram 1500, including the formats that work on a RamBox bed.

Last reviewed October 5, 2026. Think a figure here is wrong? Tell us at contact@toolboxandtruck.com and we will check it, fix it and date the correction — see our editorial policy.