How Big Is a GMC Sierra Bed?

2026 GMC Sierra 1500 pickup with its cargo box in view at Coulter Buick GMC Phoenix
GMC Sierra Truck Bed Guide

Box lengths, dimensions, and cargo volume for the Sierra 1500, 2500HD, and 3500HD, from the truck team at Coulter Buick GMC Phoenix.

Quick Answer

A GMC Sierra bed runs from 5'8" to 8'2" depending on the model and cab. The Sierra 1500 offers a Short (5'8"), Standard (6'6"), or Long (8'2") box with 62.9 to 89.1 cubic feet of cargo volume. The Sierra 2500HD and 3500HD offer a 6'8" Standard Box with 69.5 cubic feet and a Long Box of 8'1" to 8'2" with about 83.5 cubic feet.

Shopping for a new pickup and wondering exactly how much room you'll have to work with? At Coulter Buick GMC Phoenix, that's one of the first questions Phoenix truck shoppers ask, and it's a smart one to ask early. A Sierra bed that's too small turns a simple hardware run into two trips, and one that's bigger than needed just eats up parking space. Here's a straightforward look at how the Sierra 1500, 2500HD, and 3500HD stack up.

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Key Takeaways

  • The Sierra 1500 offers three box lengths: Short (5'8"), Standard (6'6"), and Long (8'2").
  • Cargo volume on the Sierra 1500 ranges from 62.9 cubic feet in the Short Box up to 89.1 cubic feet in the Long Box.
  • The Sierra 2500HD and 3500HD share similar box lengths but trade cargo room for cab space depending on configuration.
  • Crew Cab HD trucks with a Standard Box hold less cargo volume than Regular or Double Cab trucks with a Long Box.
  • Picking the right box length comes down to balancing hauling needs against everyday maneuverability.
Light Duty

How Big Is the Sierra 1500 Bed?

Rear view of a 2026 GMC Sierra 1500 showing the cargo box and tailgate

The Sierra 1500 bed size ranges from 5'8" in the Short Box to 8'2" in the Long Box, with cargo volume ranging from 62.9 to 89.1 cubic feet, depending on the chosen configuration.

Cab style determines which box length is available. Crew Cab trucks pair with the Short or Standard Box, Double Cab models typically get the Standard Box, and Regular Cab trucks are the only way to get the Long Box. Weekend haulers moving mulch or furniture usually do fine with a Standard Box, while contractors hauling sheet goods or ladders tend to lean toward the Long Box for the extra length. Whichever length fits the driveway, the GMC Sierra 1500 bed size gives buyers real flexibility without stepping up to a heavy-duty truck.

Sierra 1500 Short Box

  • Length: 69.92 in (5'8")
  • Width: 71.4 in
  • Height: 22.4 in
  • Cargo volume: 62.9 cu ft

Sierra 1500 Standard Box

  • Length: 79.44 in (6'6")
  • Width: 71.4 in
  • Height: 22.4 in
  • Cargo volume: 71.7 cu ft

Sierra 1500 Long Box

  • Length: 98.2 in (8'2")
  • Width: 71.4 in
  • Height: 22.4 in
  • Cargo volume: 89.1 cu ft
Heavy Duty

How Big Is the GMC 2500 Bed?

Rear view of a 2026 GMC Sierra 2500HD heavy-duty pickup and its cargo box

The GMC 2500 bed size comes in two lengths: a 6'8" Standard Box and an 8'1" Long Box, with cargo volume of roughly 70 and 84 cubic feet, respectively.

Sierra 2500HD trucks trade a bit of the 1500's variety for added strength: heavier-gauge steel, a sturdier frame, and higher payload ratings. The Standard Box suits Crew Cab buyers who want rear-seat room for the family or crew, while the Long Box, available on Regular and Double Cab models, is built for towing trailers, hauling equipment, or carrying oversized loads on job sites around Phoenix.

Sierra 2500HD Standard Box

  • Length: 82.25 in (6'8")
  • Width: 71.4 in
  • Height: 21.0 in
  • Cargo volume: 69.50 cu ft

Sierra 2500HD Long Box

  • Length: 98.27 in (8'1")
  • Width: 71.4 in
  • Height: 21.0 in
  • Cargo volume: approx. 83.5 cu ft
Heavy Duty

What About the Sierra 3500HD Box?

Rear view of a 2026 GMC Sierra 3500HD work truck showing the Long Box

The Sierra 3500HD shares its box dimensions with the 2500HD, but the available GMC truck box length still depends on cab choice, and that trade-off is worth understanding before ordering.

Crew Cab 3500HD trucks are limited to the 6'8" Standard Box, which comes in at 69.5 cubic feet, a bit less than the 2500HD's equivalent due to the larger cab eating into overall length. Buyers who need the full 8-foot Long Box (83.5 cubic feet of cargo room) will want a Regular or Double Cab configuration, common on dually work trucks and flatbed conversions.

Sierra 3500HD Standard Box (Crew Cab)

  • Length: 82.25 in (6'8")
  • Width: 71.4 in
  • Height: 21.0 in
  • Cargo volume: 69.5 cu ft

Sierra 3500HD Long Box

  • Length: 98.22–98.27 in (8'1"–8'2")
  • Width: 71.4 in
  • Height: 21.0 in
  • Cargo volume: 83.5 cu ft
Side-by-Side

GMC Sierra Bed Size Chart

This GMC Sierra bed size chart lines up every box option side by side, making it easy to compare length and cargo volume across the lineup at a glance.

Model
Box Option
Box Length
Cargo Volume
Sierra 1500
Short Box
5'8" (69.92 in)
62.9 cu ft
Sierra 1500
Standard Box
6'6" (79.44 in)
71.7 cu ft
Sierra 1500
Long Box
8'2" (98.2 in)
89.1 cu ft
Sierra 2500HD
Standard Box
6'8" (82.25 in)
69.5 cu ft
Sierra 2500HD
Long Box
8'1" (98.27 in)
83.5 cu ft
Sierra 3500HD
Standard Box (Crew Cab)
6'8" (82.25 in)
69.5 cu ft
Sierra 3500HD
Long Box
8'1"–8'2"
83.5 cu ft

The Bottom Line on Sierra Bed Sizes

There's no single "right" bed size; it comes down to what's actually getting hauled. A Short Box Sierra 1500 handles daily errands and weekend projects with ease, while a Long Box HD truck is built for job sites and heavy trailers. Understanding the Sierra bed lineup ahead of time makes it much easier to walk onto the lot at Coulter Buick GMC Phoenix already knowing which configuration fits.

GMC Sierra pickup lineup available at Coulter Buick GMC Phoenix

Find Your Sierra at Coulter Buick GMC Phoenix

Ready to see these bed sizes in person? Our team at Coulter Buick GMC Phoenix can walk through the Short, Standard, and Long Box Sierra trucks currently on the lot and help match one to how it'll actually be used.

Questions

FAQ

How long is a Sierra 1500 short bed?

The Sierra 1500 Short Box measures 69.92 inches, or 5'8", and it's only available on Crew Cab models.

Can the Sierra 1500 tow with a Short Box?

Yes. Box length doesn't affect towing capacity, which is determined by the engine, axle, and hitch setup rather than bed size.

Which Sierra bed is best for hauling a full sheet of plywood?

A Standard or Long Box lays a 4x8 sheet flat with the tailgate up; the Short Box requires the tailgate down or the sheet angled.

Does box length affect payload capacity?

Not directly: payload is set by the truck's suspension, frame, and axle ratings, though longer boxes are often paired with configurations that carry higher payload ratings.

Which GMC Sierra bed has the most cargo volume?

The Sierra 1500 Long Box leads the lineup with 89.1 cubic feet of cargo volume. It measures 98.2 inches (8'2") and comes on Regular Cab models.

Can you get a Long Box on a Sierra Crew Cab?

Not in the configurations covered here. Crew Cab Sierra 1500 trucks pair with the Short or Standard Box, and Crew Cab 3500HD trucks are limited to the 6'8" Standard Box. The Long Box is a Regular Cab setup on the Sierra 1500 and a Regular or Double Cab setup on the 2500HD and 3500HD.

How wide is a GMC Sierra truck bed?

Every Sierra box listed on this page measures 71.4 inches wide. Box height is 22.4 inches on the Sierra 1500 and 21.0 inches on the Sierra 2500HD and 3500HD.

What size bed comes on a Sierra 2500HD Crew Cab?

Crew Cab 2500HD buyers typically go with the 6'8" Standard Box, which measures 82.25 inches long and holds 69.5 cubic feet of cargo.