2021 Ram 1500 bed size
The 2021 Ram 1500 was sold with 3 bed configurations: the 5'7" Box (Crew Cab) at 67.4 in long, the 6'4" Box (Crew Cab) at 76.3 in long, the 6'4" Box (Quad Cab) at 76.3 in long. Actual inches below — the advertised names round.
All configurations
Crew Cab — 5'7" Box
RamBox Cargo Management System available on this bed - RamBox-equipped beds have reduced usable width (RamBox cargo width 50.0 in per Ram spec sheet) and require RamBox-specific coversMultifunction Tailgate availablebox dimensions unchangedSold alongside previous-generation Ram 1500 Classic (DS) - verify generation before ordering
| Actual length | 67.4 in |
|---|---|
| Actual width (max) | 66.4 in |
| Width between wheelhouses | 51 in |
| Bed depth | 21.4 in |
| Generation | 5th generation DT (2019-2026) |
| Tonneau cover size class | 5 ft 7 in class |
What fits: tonneau covers in the 5 ft 7 in class class listed for the 2021 Ram 1500 Crew Cab with the 5'7" Box. Bed mats and liners cut to 67.4 in; a 4×8 sheet lies flat only if the load is under 51 in wide between the wheelhouses.
Shop 5 ft 7 in class tonneau covers for this truck on Amazon (As an Amazon Associate I earn from qualifying purchases.)
Sources: Ram 2021 Ram 1500 brochure - Canada (via DealerEProcess) (checked 2026-10-27). Last verified 2026-10-27. Found an error? Tell us — see our accuracy disclaimer.
Crew Cab — 6'4" Box
RamBox Cargo Management System available on this bed - RamBox-equipped beds have reduced usable width (RamBox cargo width 50.0 in per Ram spec sheet) and require RamBox-specific coversMultifunction Tailgate availablebox dimensions unchangedSold alongside previous-generation Ram 1500 Classic (DS) - verify generation before ordering
| Actual length | 76.3 in |
|---|---|
| Actual width (max) | 66.4 in |
| Width between wheelhouses | 51 in |
| Bed depth | 21.5 in |
| Generation | 5th generation DT (2019-2026) |
| Tonneau cover size class | 6 ft 4 in class |
What fits: tonneau covers in the 6 ft 4 in class class listed for the 2021 Ram 1500 Crew Cab with the 6'4" Box. Bed mats and liners cut to 76.3 in; a 4×8 sheet lies flat only if the load is under 51 in wide between the wheelhouses.
Shop 6 ft 4 in class tonneau covers for this truck on Amazon (As an Amazon Associate I earn from qualifying purchases.)
Sources: Ram 2021 Ram 1500 brochure - Canada (via DealerEProcess) (checked 2026-10-27). Last verified 2026-10-27. Found an error? Tell us — see our accuracy disclaimer.
Quad Cab — 6'4" Box
RamBox Cargo Management System available on this bed - RamBox-equipped beds have reduced usable width (RamBox cargo width 50.0 in per Ram spec sheet) and require RamBox-specific coversMultifunction Tailgate availablebox dimensions unchangedSold alongside previous-generation Ram 1500 Classic (DS) - verify generation before ordering
| Actual length | 76.3 in |
|---|---|
| Actual width (max) | 66.4 in |
| Width between wheelhouses | 51 in |
| Bed depth | 21.5 in |
| Generation | 5th generation DT (2019-2026) |
| Tonneau cover size class | 6 ft 4 in class |
What fits: tonneau covers in the 6 ft 4 in class class listed for the 2021 Ram 1500 Quad Cab with the 6'4" Box. Bed mats and liners cut to 76.3 in; a 4×8 sheet lies flat only if the load is under 51 in wide between the wheelhouses.
Shop 6 ft 4 in class tonneau covers for this truck on Amazon (As an Amazon Associate I earn from qualifying purchases.)
Sources: Ram 2021 Ram 1500 brochure - Canada (via DealerEProcess) (checked 2026-10-27). Last verified 2026-10-27. Found an error? Tell us — see our accuracy disclaimer.