What Is a Number 2 Can Volume? (Cup Capacity Chart)

A U.S. No. 2 can has a nominal capacity of 2½ U.S. cups, equal to 20 fluid ounces, 1¼ pints, or about 591 milliliters. The number names a can-size class; it does not promise a specific food weight, drained amount, or exact usable volume. For a recipe, check the net quantity on the label and measure the contents when accuracy matters.

A can label can turn a simple recipe into a guessing game. One recipe says “one No. 2 can,” while another lists cups or ounces. The key is to separate the can’s size name from the amount of a particular food inside it. They are related, but they are not interchangeable measures.

The chart and steps below show how to convert a No. 2 can, when to trust the label, and how to handle anything left over. The examples are kitchen scenarios, not claims that every can of a given food contains the same amount.

Number 2 Can Capacity and Measurement

A U.S. No. 2 can is a nominal food-can size with a customary capacity of 2½ U.S. cups. That is 20 U.S. fluid ounces, 1¼ U.S. pints, or about 591 milliliters. Treat these as volume equivalents, not as a guaranteed weight or exact fill level for every product.

A U.S. fluid ounce measures volume. An ounce used for food weight measures mass. Those units are not equal for all foods: 20 fluid ounces of liquid and 20 ounces by weight of beans, fruit, or sauce can be different amounts.

“Nominal” means the stated figure is a standard reference, not a promise that every package contains precisely that amount in a form you can pour into a measuring cup. The can may hold solids and packing liquid, and the amount you use may depend on whether you drain it.

Why No. 2 does not mean a fixed weight

The No. 2 label identifies a can-size class, not a particular food quantity by weight. Food density, how it is packed, and the amount of liquid around it affect net and drained weights. Can dimensions can also vary by manufacturer and format, so measuring the outside is not a reliable way to find usable contents.

For exact recipe work, start with the printed net quantity. If the recipe calls for drained food, the drained weight or a measured drained volume may matter more than the can’s nominal size. If the recipe names a No. 2 can but the product label gives a different quantity, do not assume that the can number resolves the difference.

A No. 2 can is also not a cookware rating. Terms such as induction-compatible, oven-safe, cladding, and heat retention describe cookware, not the volume class of a food can.

Converting Can Contents for Recipes

For a volume-based recipe, use 2½ U.S. cups as the No. 2 can’s nominal equivalent. Then check whether the recipe means the contents as packed, drained solids, or liquid alone. That distinction can change the amount you add, even when the can carries the same size designation.

Use this sequence:

1. Read the label. Find the printed net quantity if the recipe needs a precise amount. A net weight is not automatically a volume measurement.
2. Check the recipe wording. “Undrained” means include the packing liquid; “drained” means remove it before measuring or weighing.
3. Measure the right part. For a volume substitution, measure 2½ cups only when that is what the recipe calls for. Drain or keep the liquid as directed.
4. Adjust only with a reason. If the label’s quantity or drained amount differs from what the recipe needs, use a measuring cup or scale rather than guessing from the can number.

Two recipe examples

Example: canned fruit for a dessert. If a recipe calls for one No. 2 can of fruit, first check whether it says to drain the fruit. Measuring 2½ cups of fruit with syrup included will not give the same amount of fruit solids as draining it and measuring again.

Example: soup or sauce. If the recipe needs a set volume of liquid, measure the liquid rather than relying on the can number. If it calls for a can of a named product, use the label and recipe together to decide whether the packing liquid belongs in the pot.

These examples show why “one can” is useful shorthand but not a precise substitute for every measurement. Follow the recipe’s instructions about draining and measure when the difference could affect the result.

Safe Storage and Handling After Opening

Once opened, a food can is packaging, not the best container for storing leftovers. Transfer unused food to a clean, covered, food-safe container and refrigerate it promptly. Follow the food label and suitable food-safety guidance for storage time, since safe keeping depends on the food and how it has been handled.

If you plan to heat the contents, transfer them to suitable cookware first. Do not heat food in its can unless the packaging explicitly says it is designed for that use. Follow the package and recipe instructions for heating; the No. 2 designation gives no guidance about oven or stovetop safety.

For perishable food, a widely used food-safety rule is to refrigerate it within two hours, or within one hour when the surrounding temperature is above 90°F (32°C). Keep the refrigerator at or below 40°F (4°C). If the package gives more specific directions, use those instructions.

A practical sequence is:

• Open the can with a clean opener and utensil.
• Set aside the amount needed for the recipe.
• Move leftovers to a covered, food-safe container.
• Label or note the date if you may not remember when you opened it.
• Refrigerate promptly and follow food-specific storage guidance.

Serving and Portioning

A 2½-cup nominal volume can help with planning, but it does not define a standard number of servings. Serving size depends on the food, the recipe, and how it is served. Use the recipe’s yield or measure the prepared food to estimate portions instead of assuming that one No. 2 can feeds a fixed number of people.

For a simple portion estimate, divide the amount you actually plan to serve by the number of portions needed. For example, if a recipe uses the full nominal 2½ cups and divides it evenly among five servings, that is ½ cup per serving. This arithmetic does not account for ingredients added to the recipe or liquid left behind.

These are arithmetic examples, not suggested serving sizes. If you drain the food, the amount of solids may be less than 2½ cups. Measure the part you intend to serve for a more useful estimate.

The most reliable habit is to keep three quantities separate: the can’s nominal volume, the label’s net quantity, and the amount you actually use. This avoids treating a size name as an exact recipe measure.

Frequently Asked Questions

These quick answers clarify the most common No. 2 can conversions and measurement limits. Use the nominal capacity for a general volume estimate, but check the package and recipe whenever weight, drained contents, or exact quantities matter.

How many cups are in a No. 2 can?

A U.S. No. 2 can has a nominal capacity of 2½ U.S. cups. That equals 20 U.S. fluid ounces or about 591 milliliters. The actual amount of usable food can differ if the product contains packing liquid or the recipe calls for drained solids.

Is a No. 2 can the same as a 20-ounce can?

It is equivalent to 20 U.S. fluid ounces as a nominal volume. But “20 ounces” on a food label may refer to net weight, not fluid volume. Check the unit and wording before substituting, especially when a recipe depends on an exact amount.

How many milliliters are in a No. 2 can?

The nominal equivalent is about 591 milliliters, or 0.591 liters. This conversion uses U.S. cups and U.S. fluid ounces. It describes the can-size reference, not necessarily the precise volume of drained food in a specific package.

Does a No. 2 can always have the same net weight?

No. The size number does not set a universal net weight. Different foods have different densities, and packing liquid affects the amount and weight of solids. Read the product label when the recipe specifies weight or when precision matters.

Should I drain a No. 2 can before measuring?

Drain it only when the recipe says to drain it or when you need the solids alone. If the recipe calls for the liquid too, retain it. Drained food and food measured with its liquid are different quantities, even from the same can.

Is a No. 2 can the same as a No. 2½ can?

No. They are different can-size designations. Do not treat the numbers as interchangeable or assume a recipe written for one will work with the other. Check the package’s net quantity and measure the contents needed for your recipe.

Can I use the can’s dimensions to calculate its capacity?

That is not a dependable method. Dimensions can vary by manufacturer and format, and the outside shape does not tell you the usable amount of food. Use the nominal conversion for a general estimate and the label or a measuring tool for exact quantities.

Can I store leftovers in the opened can?

Transfer leftovers to a clean, covered, food-safe container and refrigerate them promptly. Do not use the opened can as the storage container. Follow the food label and food-specific storage guidance for how long the leftovers can be kept.

Can I heat food in a No. 2 can?

Do not heat food in its can unless the packaging explicitly states that it is designed for that use. Transfer the contents to suitable cookware and follow the food label and recipe instructions. The No. 2 size name does not indicate heating safety.

(This article was written by one of our staff writers, Julian R. Hayes. Visit our Meet the Team page.)