Ram · Heavy-duty 1-ton pickup
Ram 3500 bed size & length
Every Ram 3500 bed length in inches, generation by generation, from 2003–2026 — which cab each one comes with, and the tonneau cover size it takes.
2019–present · 5th gen (Ram 3500)
6.4 ft · 8 ft
2 beds offered
Lengths are the inside floor measurement for the generation shown. Brochure names round hard — always measure your own bed before ordering a cover.
Ram 3500 bed size by year
The same beds across the run on record — but inside lengths still shift slightly between generations.
| Years | Generation | Bed | Length | Inches | Cabs |
|---|---|---|---|---|---|
| 2019–present | 5th gen (Ram 3500) | 6.4 ft | 6'4" | 76.3" | Crew Cab, Mega Cab |
| 〃 | 8 ft | 8'0" | 98.3" | Regular Cab, Crew Cab | |
| 2010–2018 | 4th gen (Ram 3500) | 6.4 ft | 6'4" | 76.3" | Crew Cab, Mega Cab |
| 〃 | 8 ft | 8'0" | 98.3" | Regular Cab, Crew Cab | |
| 2003–2009 | 3rd gen (Dodge Ram 3500) | 6.4 ft | 6'4" | 76.3" | Regular Cab, Quad Cab, Mega Cab |
| 〃 | 8 ft | 8'0" | 98.3" | Regular Cab, Quad Cab |
What cover size a Ram 3500 takes
Tonneau covers are sold by bed category, not by exact inches. Here is where each Ram 3500 bed lands — and every other truck in the same category, in case you are cross-shopping a used cover.
Measuring a Ram 3500 bed properly
Two minutes with a tape beats any chart, including this one. Covers are cut to the inside of the bed, so that is what has to be measured.
- 1
Close the tailgate
Measure with the tailgate up and latched. A bed measured with the gate down reads roughly 20 inches long and every cover ordered off that number comes back.
- 2
Measure inside, along the floor
Run the tape on the bed floor from the front bulkhead to the inside face of the closed tailgate. Not along the top of the rails, and not down the outside of the body — both read longer than the bed actually is.
- 3
Measure over a spray-in liner
If the bed is sprayed, measure over the coating. That is the surface the cover sits on. A drop-in plastic liner is a different matter — if its lip wraps over the top of the rail, it sits between the bed and the cover's clamps.
- 4
Round to the nearest category
Your tape will read something like 76.3" rather than a clean number. Covers are sold in categories, so match the category and then confirm the fit against your exact year.
Ram 3500 bed size — frequently asked
What bed sizes does the Ram 3500 come in?
The 2019–present Ram 3500 is offered with 2 beds: 6.4 ft (76.3") and 8 ft (98.3"). That line-up has held across the model's run on record, though exact inside lengths still shift slightly between generations.
How long is the Ram 3500 bed in inches?
The 6.4 ft bed measures 76.3 inches along the floor, and it is the shortest of 2 on the current truck. Manufacturers round these in their brochures — a "5.5 ft" bed is rarely 66 inches exactly — so measure your own floor from the bulkhead to the closed tailgate before ordering anything cut to length.
How do I measure my Ram 3500 bed?
Measure inside the bed, along the floor, from the front bulkhead to the inside face of the closed tailgate. Do not measure the outside of the body, and do not include the tailgate when it is down. If a spray-in liner is fitted, measure over it, since that is the surface a cover clamps against.
What size tonneau cover fits a Ram 3500?
Covers are sold by bed category, and the Ram 3500 falls into these categories: 6.5 ft and 8 ft. Match the category to your own bed, then confirm the exact year and generation — bed rails, tie-down systems and cargo-management tracks change between generations even when the length does not.
Will a cover from a different Ram 3500 year fit mine?
Only if the bed length and the rail design both match. Length is the first check and the easiest to get right; the second is how the cover clamps, because a generation change often moves the rail profile or adds a factory cargo track. Check both before buying a used cover.
