How many cans fit in a cooler? Take the printed number and halve it

The short arithmetic

A 12 oz beverage can displaces roughly three quarters of a quart once you account for the air between stacked cylinders. Across the coolers on this site, measured volume divided by published can count lands between 1.3 and 1.6 cans per quart, and 1.4 is a safe working figure for a cooler packed to the lid with nothing else in it.

Nobody uses a cooler that way. The moment you add ice, the count halves, because ice and cans compete for the same cubic inches. YETI builds that into its published numbers: it rates the Tundra 45 at 28 cans at a 2:1 ice-to-can ratio where another brand would print 60 for the same box. Both numbers are honest; they answer different questions.

Cans by cooler size

Published counts are the makers' own except where marked measured, which are OutdoorGearLab's. The realistic column is the published figure halved for a 2:1 ice-to-can load — the same ratio YETI uses in its own specifications. It is arithmetic, not a test result.

Why you halve the number

Cans do not need to be surrounded by ice to stay cold; they need the air and water around them to stay near freezing. In practice that takes roughly as much ice by volume as there is contents, which is where the 2:1 convention comes from. Go lighter on ice and you have more cans that warm up by hour six. Go heavier and you get a cooler that holds temperature for days with fewer drinks in it. Our packing guide covers the order the layers go in.

One exception is worth knowing: if the cans go in already refrigerator-cold and the cooler was pre-chilled overnight, you can run closer to a 3:1 contents-to-ice load for a single day out. That is how you get near the printed number without the drinks going warm — but it only works for one day, and only if nothing went in warm.

Shape beats quarts

Two 45-quart coolers can hold different numbers of cans depending on their interior shape, which is why the published counts in the table scatter. Cans stack in neat layers, so what matters is whether an exact number of 4.8-inch layers fits the interior height, and whether the floor is a whole number of cans wide.

The RTIC 65's interior is 26 × 13 × 12 inches — two and a half can layers deep, so the top layer is partly wasted unless you lay that row on its side. The YETI Roadie 24's 13.25-inch interior height takes two upright layers with room for ice over them, which is why it punches above its 20 measured quarts at 32 cans. For food rather than drinks, the number to look at is interior length, which is covered in what size cooler do I need. Every published interior and exterior measurement on this site is collected in cooler dimensions and sizes, including how many inches of each cooler's length go into the foam rather than the cans.

How much ice that leaves room for

Makers publish this too, and it is the cleanest way to sanity-check a can count. RTIC rates the 45 Ultra-Tough at either 60 cans or 41 lb of ice, and the 65 at either 84 cans or 58 lb of ice. Those are the two extremes of the same box. A real load of half cans and half ice sits in the middle: about 30 cans and 20 lb for the 45, about 42 cans and 29 lb for the 65.

If you would rather not carry that much water, ice packs change the arithmetic: a sheet pack is flatter than cubed ice and wastes less of the interior. The measured comparison is in best ice packs for coolers, and the ratios are in how many ice packs do I need.