GMC Sierra Truck Bed Dimensions
What size is the bed on a 2026 GMC Sierra?
The 2026 GMC Sierra bed is 98.2 in (8.2 ft) long in the 8-ft Long Bed, with 50.6 in between the wheel wells and 89.1 cu ft of cargo volume.
Latest model year (2026):
The GMC Sierra bed measures 98.2 in (8.2 ft) long in the 8-ft Long Bed, or 69.9 in (5.8 ft) in the 5-ft 8-in Short Bed, with 50.6 in between the wheel wells and 89.1 cu ft of cargo volume.
GMC Sierra Bed Size — All Years
| Year | Bed | Length | Width | Between Wheel Wells | Depth | Volume |
|---|---|---|---|---|---|---|
| 2026Config 1 of 3 | 5-ft 8-in Short Bed | 69.9 in | 71.4 in | 50.6 in | 22.4 in | 62.9 cu ft |
| 2026Config 2 of 3 | 6-ft 6-in Standard Bed | 79.4 in | 71.4 in | 50.6 in | 22.4 in | 71.7 cu ft |
| 2026Config 3 of 3 | 8-ft Long Bed | 98.2 in | 71.4 in | 50.6 in | 22.4 in | 89.1 cu ft |
| 2025Config 1 of 3 | 5-ft 8-in Short Bed | 69.9 in | 71.4 in | 50.6 in | 22.4 in | 62.9 cu ft |
| 2025Config 2 of 3 | 6-ft 6-in Standard Bed | 79.4 in | 71.4 in | 50.6 in | 22.4 in | 71.7 cu ft |
| 2025Config 3 of 3 | 8-ft Long Bed | 98.2 in | 71.4 in | 50.6 in | 22.4 in | 89.1 cu ft |
| 2024Config 1 of 3 | 5-ft 8-in Short Bed | 69.9 in | 71.4 in | 50.6 in | 22.4 in | 62.9 cu ft |
| 2024Config 2 of 3 | 6-ft 6-in Standard Bed | 79.4 in | 71.4 in | 50.6 in | 22.4 in | 71.7 cu ft |
| 2024Config 3 of 3 | 8-ft Long Bed | 98.2 in | 71.4 in | 50.6 in | 22.4 in | 89.1 cu ft |
| 2023Config 1 of 3 | 5-ft 8-in Short Bed | 69.9 in | 71.4 in | 50.6 in | 22.4 in | 62.9 cu ft |
| 2023Config 2 of 3 | 6-ft 6-in Standard Bed | 79.4 in | 71.4 in | 50.6 in | 22.4 in | 71.7 cu ft |
| 2023Config 3 of 3 | 8-ft Long Bed | 98.2 in | 71.4 in | 50.6 in | 22.4 in | 89.1 cu ft |
| 2022Config 1 of 3 | 5-ft 8-in Short Bed | 69.9 in | 71.4 in | 50.6 in | 22.4 in | 62.9 cu ft |
| 2022Config 2 of 3 | 6-ft 6-in Standard Bed | 79.4 in | 71.4 in | 50.6 in | 22.4 in | 71.7 cu ft |
| 2022Config 3 of 3 | 8-ft Long Bed | 98.2 in | 71.4 in | 50.6 in | 22.4 in | 89.1 cu ft |
| 2021Config 1 of 3 | 5-ft 8-in Short Bed | 69.9 in | 71.4 in | 50.6 in | 22.4 in | 62.9 cu ft |
| 2021Config 2 of 3 | 6-ft 6-in Standard Bed | 79.4 in | 71.4 in | 50.6 in | 22.4 in | 71.7 cu ft |
| 2021Config 3 of 3 | 8-ft Long Bed | 98.2 in | 71.4 in | 50.6 in | 22.4 in | 89.1 cu ft |
| 2020Config 1 of 3 | 5-ft 8-in Short Bed | 69.9 in | 71.4 in | 50.6 in | 22.4 in | 62.9 cu ft |
| 2020Config 2 of 3 | 6-ft 6-in Standard Bed | 79.4 in | 71.4 in | 50.6 in | 22.4 in | 71.7 cu ft |
| 2020Config 3 of 3 | 8-ft Long Bed | 98.2 in | 71.4 in | 50.6 in | 22.4 in | 89.1 cu ft |
| 2019Config 1 of 3 | 5-ft 8-in Short Bed | 69.9 in | 71.4 in | 50.6 in | 22.4 in | 62.9 cu ft |
| 2019Config 2 of 3 | 6-ft 6-in Standard Bed | 79.4 in | 71.4 in | 50.6 in | 22.4 in | 71.7 cu ft |
| 2019Config 3 of 3 | 8-ft Long Bed | 98.2 in | 71.4 in | 50.6 in | 22.4 in | 89.1 cu ft |
| 2018Config 1 of 3 | 5-ft 8-in Short Bed | 69.3 in | 71.4 in | 50.6 in | 21 in | 53.4 cu ft |
| 2018Config 2 of 3 | 6-ft 6-in Standard Bed | 79.4 in | 71.4 in | 50.6 in | 21 in | 61 cu ft |
| 2018Config 3 of 3 | 8-ft Long Bed | 97.8 in | 71.4 in | 50.6 in | 21 in | 76.3 cu ft |
| 2017Config 1 of 3 | 5-ft 8-in Short Bed | 69.3 in | 71.4 in | 50.6 in | 21 in | 53.4 cu ft |
| 2017Config 2 of 3 | 6-ft 6-in Standard Bed | 79.4 in | 71.4 in | 50.6 in | 21 in | 61 cu ft |
| 2017Config 3 of 3 | 8-ft Long Bed | 97.8 in | 71.4 in | 50.6 in | 21 in | 76.3 cu ft |
| 2016Config 1 of 3 | 5-ft 8-in Short Bed | 69.3 in | 71.4 in | 50.6 in | 21 in | 53.4 cu ft |
| 2016Config 2 of 3 | 6-ft 6-in Standard Bed | 79.4 in | 71.4 in | 50.6 in | 21 in | 61 cu ft |
| 2016Config 3 of 3 | 8-ft Long Bed | 97.8 in | 71.4 in | 50.6 in | 21 in | 76.3 cu ft |
| 2015Config 1 of 3 | 5-ft 8-in Short Bed | 69.3 in | 71.4 in | 50.6 in | 21 in | 53.4 cu ft |
| 2015Config 2 of 3 | 6-ft 6-in Standard Bed | 79.4 in | 71.4 in | 50.6 in | 21 in | 61 cu ft |
| 2015Config 3 of 3 | 8-ft Long Bed | 97.8 in | 71.4 in | 50.6 in | 21 in | 76.3 cu ft |
Manufacturer specification data sourced from Manufacturer specifications, last verified August 12, 2026. Always confirm against the owner's manual or door-jamb placard before towing or buying tires — figures vary by cab, bed, axle ratio, and options.
GMC Sierra data analysis
Longest bed: 98.2 inches
The longest GMC Sierra bed measures 98.2 in — 8.2 ft, the 8-ft Long Bed. The short bed drops to 69.3 in — 28.9 in shorter, more than two feet of usable floor. Cab choice usually forces this decision, not preference. Width at the rails is 71.4 in, depth 22.4 in. That puts the GMC Sierra second of 17 pickups we hold data for. The cohort median is 74 in, so this vehicle sits 24.2 in above the middle of the field. Immediately behind: the Ford F-350 at 98.1 in. Chevrolet Silverado matches it exactly — that figure is a segment convention, not an engineering ceiling. Peak cargo volume is 89.1 cu ft — about the load space of a large cargo van's floor.
Does a 4x8 sheet fit flat
Yes, with room to spare: 50.6 in between the wheel wells against a 48 in sheet, so plywood and drywall lie flat and still leave 2.6 in of slack. Length is not the constraint: 98.2 in takes a full 8 ft sheet with the tailgate closed. Bedside tie-down rails and toolboxes eat into these figures too — the published width is bare metal to bare metal.
Configurations covered
36 bed configurations across 2015–2026, one row per bed and cab combination. Beds on file: 5-ft 8-in Short Bed, 6-ft 6-in Standard Bed, 8-ft Long Bed. The longest bed is rarely orderable with the largest cab. Figures are manufacturer specifications as filed — nominal inside dimensions, not measurements we took. Sources for these 36 rows: manufacturer filings, covering 12 model years.
How GMC Sierra bed length varies
Across 36 configurations recorded for the 2015 through 2026 GMC Sierra, bed length runs from 69.3 inches to 98.2 inches. The strongest figure belongs to the 2019 GMC Sierra (8-ft Long Bed) at 98.2 inches, and the weakest to the 2018 car (5-ft 8-in Short Bed) at 69.3 inches — a spread of 42%. A gap that wide means the model year and configuration you buy matter more than the nameplate does: quoting a single number for the GMC Sierra would be misleading.
What changed for 2026
Average bed length for the 2026 GMC Sierra is 82.5 inches, against 82.5 inches for the 2025 car — it held flat. A carry-over year like this usually means no powertrain or structural change, so an older example is the cheaper way into the same specification.
Configurations behind these GMC Sierra numbers
The 2015 through 2026 GMC Sierra entries here cover the variants 5-ft 8-in Short Bed, 6-ft 6-in Standard Bed and 8-ft Long Bed. 2026 is the busiest model year in the record with 3 separate measured configurations, which is why a single quoted bed length figure for that year is rarely the one that matches the car in front of you. Match the row to the exact drivetrain, body style and engine on the window sticker or VIN before relying on the number, and use the comparison links below to see how those same configurations line up against rival models.
Frequently Asked Questions About Sierra Bed Size
How long is the GMC Sierra bed?
The GMC Sierra bed measures 98.2 inches (8.2 ft) at the floor in the 8-ft Long Bed. Shorter bed configurations are listed year by year in the table above.
Will a 4x8 sheet of plywood fit in a GMC Sierra?
The GMC Sierra measures 50.6 inches between the wheel wells, so a 48-inch sheet lies flat between them. With the tailgate down and the load properly flagged, an 8-foot sheet will overhang on any short bed.
How much cargo volume does the GMC Sierra bed have?
Cargo volume is about 89.1 cubic feet with a 22.4-inch bed depth. Volume is measured to the top of the bed rails, so a level load will be less.