Ammo Can Dimensions: Size ,Height & Storage CAPACITY (2026)

This guide breaks down exact ammo can dimensions for every standard military size, explains why the numbers shift between sellers, and answers the exact questions shooters and preppers type into Google.

Ammo Can Dimensions Chart (All Sizes)

These figures follow MIL-DTL-3060F, the military specification that governs steel ammo box construction in the United States.

Steel gauge thickness runs between 0.9mm and 1.2mm depending on can size. Thicker steel means more rigidity, but also more space lost between the outer shell and the usable interior.

50 Cal Ammo Can Dimensions

The .50 cal ammo can, officially the M2A1, is the most recognized ammo storage box in America.

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How Tall Is a 50 Cal Ammo Can?

A 50 cal ammo can stands 7.5 inches tall on the outside. Inside, usable height drops to about 6.81 inches once you account for the gasket seal and the lid’s internal lip.

That missing inch isn’t wasted space, it’s the rubber gasket doing its job.

50 Cal vs Fat 50: What’s the Real Difference?

The Fat 50, model PA108, shares the same 12-inch length as the standard 50 cal but adds extra width and height. Standard 50 cal width sits at 6.09 inches.

The Fat 50 jumps to 7.5 inches. That difference exists for one reason: linked .50 caliber belt ammunition needs more lateral room than loose rounds.

How Many Rounds Fit in a 50 Cal Ammo Can?

Interior volume on a standard 50 cal can works out to roughly 0.29 cubic feet. Loaded loose, that space holds approximately 800 rounds of 5.56x45mm or 400 rounds of 7.62x51mm.

30 Cal Ammo Can Size

The .30 cal ammo can, model M19A1, is the compact sibling in the ammo can family. It’s the size most people grab when portability matters more than volume.

30 Cal Exterior and Interior Dimensions

The 30 cal can measures 11 inches long, 3.75 inches wide, and 7 inches tall externally. Internal usable space drops to 10.19 × 3.63 × 6.69 inches.

Empty weight sits at just 4 to 5 pounds, the lightest of any standard military ammo can. The narrow 3.75-inch width is the giveaway feature. It was built to hold stacked rifle clips, not bulky belted rounds.

40mm and 20mm Ammo Can Dimensions: Large Format

These large-format cans were built for grenade launcher rounds and autocannon ammunition, but civilians now use them for bulk tool storage and long-term gear caches.

What Are the Dimensions of a 40mm Ammo Can?

The 40mm ammo can, designated M548 by some manufacturers and M116A2 by others, measures 18 inches long, 7 inches wide, and 10 inches tall. This naming overlap causes real confusion online, since two different model numbers are often used to describe nearly identical boxes.

Interior space comes out to 17 × 6.5 × 9.5 inches, originally sized to hold linked 40mm grenade cartridges for the Mk 19 grenade launcher.

What Are the Dimensions of a 20mm Ammo Can?

The 20mm heavy ammo can measures 18.6 inches long, 8.5 inches wide, and 14.6 inches tall externally, with 17.25 × 7.5 × 14 inches of usable interior. Empty weight runs 19 to 20 pounds, making this the heaviest format most civilians will encounter.

For shelf planning, a 20mm can needs at least 15.5 inches of vertical clearance to allow the lid to swing fully open without hitting a shelf above it.

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Ammo Can Stacking, Storage and Shelf Space Planning

Vertical clearance is the most overlooked number in any ammo can purchase. Add roughly 1 inch above each can’s listed height to account for handle clearance during lifting. A 50 cal can at 7.5 inches tall needs 8.5 inches minimum of shelf space to remove and replace without forcing the handle against the shelf above.

Stacking height depends on can size and latch strength. For loaded 50 cal cans, three-high is the practical safe limit. Stack beyond that and the bottom can’s latch and handle assembly absorbs structural stress it wasn’t designed for over long periods.

Steel gauge plays a direct role here too. Cans built with 1.2mm steel resist denting under stacked weight far better than thinner 0.9mm versions. Cheaper imported cans sometimes drop below 0.9mm, and that thinner wall shows up fast as warping once cans are stacked for months at a time.

Mounting ammo cans inside vehicles. Off-road and overlanding communities frequently bolt a 50 cal or 30 cal can into a truck bed or center console as rugged, lockable storage. For this setup, measure handle swing clearance separately from can height, since the handle needs to fold flat or lift freely depending on mounting orientation. A can bolted too close to a wheel well or seat bracket will jam the latch mechanism over time.

FAQs

What are the dimensions of a 20mm ammo can?

The 20mm heavy ammo can measures 18.6 inches long, 8.5 inches wide, and 14.6 inches tall externally. Interior usable space is 17.25 × 7.5 × 14 inches. Empty weight runs 19 to 20 pounds.

What are the dimensions of a 40mm ammo can?

The 40mm ammo can measures 18 inches long, 7 inches wide, and 10 inches tall externally. Interior space is 17 × 6.5 × 9.5 inches. It was originally built for linked 40mm grenade cartridges.

What size is a 30 cal ammo can?

The 30 cal ammo can, model M19A1, measures 11 inches long, 3.75 inches wide, and 7 inches tall externally. It weighs 4 to 5 pounds empty, the lightest standard ammo can size.

How tall is a 50 cal ammo can?

A standard 50 cal ammo can stands 7.5 inches tall externally. Usable interior height drops to roughly 6.81 inches due to the rubber gasket seal and lid lip.

Use the interactive Can Dimension Calculator below to calculate can height, diameter, capacity, and volume in seconds.

Can Dimension Calculator

James Walker

James Walker is a content researcher and writer specializing in dimensions, measurements, size comparisons, and conversion topics. He creates clear, practical, and easy-to-understand guides that help readers visualize and understand real-world measurements.