GMA pallet: Sizes and types

GMA pallets play a key role in global logistics, namely across supply chains linked to the US market. They support efficient transportation, storage, and material handling across multiple industries. As one of the world’s most widely adopted pallet formats, they help streamline logistics operations in increasingly interconnected supply chains.

In this post, we explain what a GMA pallet is, outline its standard dimensions, and look at the different types based on their construction, material, and intended application. We’ll also compare them with Euro pallets.

What is a GMA pallet?

The GMA pallet is the standard unit load across the US, Canada, and parts of Latin America. Its origins can be traced back to the Consumer Brands Association (formerly the Grocery Manufacturers Association, or GMA), which promoted the adoption of this format to streamline the movement of goods. GMA pallets are also known as universal, ISO, American, and US pallets.

One of the defining features of the GMA pallet is its standard size of 48" x 40" (1,219 x 1,016 mm). The advantage of working with this unit load in the US is its compatibility with the vast majority of warehouses, distribution centers, and manufacturing facilities.

Why has it become the industry standard? The answer lies in its extensive adoption across the logistics sector, which has encouraged the development of storage systems, forklifts, and transportation solutions designed around its dimensions.

As a result, GMA pallets are widely used throughout global supply chains, exports to the Americas, and logistics environments where standardization is essential for safe, efficient load handling.

What are the dimensions of a GMA pallet?

Although the GMA pallet is the most popular format in the US, it’s not the only one in the North American market. Several standard sizes are utilized depending on the industry, including food and beverage, automotive, military, chemical, and pharmaceutical applications.

Standard GMA pallet dimensions

A standard GMA pallet measures 48" x 40" (1,219 x 1,016 mm). These dimensions provide a usable surface area of approximately 13.3 ft² (1.23 m²).

Other GMA pallet sizes

Alongside the standard GMA format, other pallet sizes can be found in specific industries. For example, 42" x 42" pallets are common in the beverage industry, while 48" x 48" pallets are often utilized in the chemical sector. Other formats, such as 48" x 42" and 40" x 40" pallets, are designed to meet particular storage, transportation, and product requirements. The right choice is determined by the type of load, the material handling equipment employed, and the needs of each operation.

When evaluating GMA pallet capacity, both storage volume and transportation efficiency are important considerations. For instance, when working with 16" x 12" (400 x 300 mm) boxes, nine boxes can be arranged on each layer of a conventional pallet. Likewise, a standard trailer can accommodate 26 to 30 GMA pallets, depending on the load configuration and overall weight.

What types of GMA pallets are there?

GMA pallets can be classified according to their material, construction, and intended application.

By material

GMA pallets are manufactured from a range of materials. Wood pallets are by far the most widespread thanks to their strength, affordability, and repairability. This makes them the preferred choice for logistics and distribution. Plastic pallets are also extensively used. As these carriers are lightweight, hygienic and easy to clean, they’re highly valued in the food and pharmaceutical industries.

More demanding industrial environments often rely on metal pallets, which offer exceptional durability and high load capacity. Lastly, corrugated pallets provide a lightweight, recyclable, and cost-effective alternative. They’re mainly intended for exports or single-use shipments.

By construction: Stringer, block, and reinforced pallets

GMA pallets are available in different structural designs. Across North America, stringer pallets are the most popular. They feature a simpler, more economical design with three or more longitudinal stringers (solid parallel boards) that support the top deckboards.

Block pallets, by contrast, feature a series of blocks typically arranged in a 3 x 3 grid. This design allows for four-way entry, making these pallets more versatile while delivering better performance in automated warehouses.

Reinforced GMA pallets are another option. These can be either stringer or block designs but incorporate additional features, such as thicker deckboards or structural reinforcements, to increase their load capacity and withstand more demanding operating conditions.

By entry type: 2-way and 4-way

GMA pallets can also be classified according to the number of entry points — that is, the sides from which forklift forks can handle them.

Two-way pallets can only be accessed from two opposite sides, offering less flexibility during warehouse operations. On the other hand, 4-way pallets allow fork entry from all four sides, making them easier to handle and better suited to facilities with high inventory turnover.

In many cases, a pallet’s construction determines its entry type. By and large, stringer models are 2-way, and block pallets are 4-way. However, a pallet’s design doesn’t always dictate how it’s accessed; although less common, 4-way stringer pallets do exist.

GMA pallet weight and capacity

The weight and load capacity of a GMA pallet can vary considerably in line with its dimensions, construction (stringer or block), material, and intended application (static, dynamic, or racked loads).

As a rule, a standard wood GMA pallet weighs 33–49 lb (15–22 kg) unloaded. Reinforced or higher-quality models can reach 55–66 lb (25–30 kg).

In terms of load capacity, standard GMA pallets generally support 2,000–2,800 lb (900–1,270 kg) under dynamic loading conditions and 2,500–4,600 lb (1,100–2,100 kg) under static loads, when the pallet remains stationary on the floor. These figures are intended as a general guide and may vary based on the pallet’s design and operating conditions.

When GMA pallets are stored on racks, their load capacity hinges largely on the support configuration and the storage setup. For this reason, the manufacturer’s specifications should always be consulted before placing pallets in rack systems.

GMA pallet height and maximum load height

A standard 48" x 40" GMA pallet is typically 5.5–6" (140–150 mm) high, although the exact height varies according to its design and the material from which it’s made.

There is no single maximum load height, as this is subject to the type of goods being stored, their stability, and the storage and transportation conditions. In most cases, the combined height of the GMA pallet and its load is 4–5.2' (1.2–1.6 m).

GMA pallets are also subject to stacking limitations. In the US, for example, OSHA regulations require materials to be stored securely and at a safe height to minimize the risk of slipping, falling, or collapse. The maximum stacking height is determined by factors such as packaging strength and load distribution.

Differences between a GMA pallet and a Euro pallet

The main difference between these two pallet types lies in their dimensions. At 48" x 40" (1,219 x 1,016 mm), GMA pallets are similar in length to Euro pallets (1,200 x 800 mm) but considerably wider. Their nearly square shape contrasts with the more rectangular proportions of the Euro pallet. The larger footprint of the GMA pallet can also provide greater stability for certain types of loads, such as liquids and high-volume palletized goods.

The two formats also differ in terms of standardization. GMA pallets follow widely adopted US industrial standards, most notably the GMA specification. The Euro pallet, standardized throughout Europe, are managed by the European Pallet Association (EPAL) in accordance with EU regulations. For a more detailed comparison, read our article on the differences between Euro pallets and US pallets.

The GMA pallet in warehouse operations

Knowing the size and characteristics of the pallets to be handled in a logistics facility is key to achieving efficiency. This is vital when implementing solutions such as Interlake Mecalux’s autonomous mobile robots (AMRs) and 3D Automated Pallet Shuttle, as pallet size influences racking configuration, material flows, and overall logistics operations.

Although warehouses can accommodate both GMA and Euro pallets, most standardize on a single format. Selective pallet racking can often be adapted to store both, although this may reduce storage capacity. Conversely, automated warehouses normally operate with a single pallet type to minimize disruptions and maximize performance. Interlake Mecalux’s storage solutions can accommodate different pallet formats — including the GMA pallet — thanks to configurable rack levels, load capacities, and system layouts.

GMA pallet: A cornerstone of international logistics

The GMA pallet is a key element in global logistics operations, especially across the US, Canada, and Latin America. Its standard dimensions, strength, and versatility make it a reliable solution for numerous industries. However, choosing the right pallet also means considering factors such as load capacity, stacking height, and compatibility with storage systems. Understanding these characteristics — as well as the differences between GMA and Euro pallets — is imperative for streamlining logistics operations.