If a recipe calls for fresh tomatoes but you have a can in the pantry, the useful starting point is the package label. The can’s weight does not tell you exactly how many tomatoes went into it.
There is no fixed number of tomatoes in a 14.5 oz or 28 oz can. Fruit size, tomato form and packing liquid affect the contents. For cooking, check the net weight and whether the recipe needs the whole contents or drained tomatoes, rather than converting the can into a guessed fruit count.
The FDA explains that net quantity usually includes packing liquid. It excludes the container itself, but it is not necessarily the weight of tomato flesh alone.
- Benefits Of Choosing Canned Tomatoes Over Fresh Ones
- How Are Fresh Tomatoes Canned?
- Are Canned Tomatoes Better Than Fresh Tomatoes?
- How To Substitute Canned Tomatoes For Fresh Ones?
- How Many Tomatoes Are In A Can Of Diced Tomatoes?
- How Many Tomatoes Are In A Can Of Crushed Tomatoes?
- How Many Tomatoes Are In A Can Of Tomato Paste?
Benefits Of Choosing Canned Tomatoes Over Fresh Ones
Canned tomatoes are convenient when you need tomatoes for a cooked dish and don’t have fresh ones available. Whole peeled tomatoes can be chopped or crushed, while diced and crushed products save some preparation.
Unopened, shelf-stable cans can stay in a cool, dry cupboard according to their label instructions. That convenience ends once you open the can.
After opening, cover and refrigerate unused tomatoes promptly at 40°F (4°C) or below. Follow the product’s storage directions. For example, Colavita tells users of its whole peeled tomatoes to refrigerate them in a suitable food container and use them within three days.
The FDA advises refrigerating food that needs refrigeration within two hours, or within one hour when the temperature is above 90°F (32°C). Don’t treat an opened can like an unopened pantry item.
How Are Fresh Tomatoes Canned?
Commercial canned tomatoes are heat-processed before or after the container is sealed. The U.S. canned-tomato standard allows different tomato forms and packing media, so there is no single recipe that describes every brand.
Read the ingredient list to see whether the tomatoes are packed in juice or puree and whether salt, seasonings, citric acid or calcium chloride have been added. Citric acid adjusts acidity, while calcium chloride can help keep the tomatoes firm.
Heat processing can change texture and nutrients. Utah State University Extension notes that some vitamins are lost during heating, so canned tomatoes should not be described as retaining every property of fresh, raw tomatoes.
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Are Canned Tomatoes Better Than Fresh Tomatoes?
The better choice depends on what you are making. Canned tomatoes are useful in sauces, soups and stews, but their processed texture will not duplicate fresh tomato slices in every dish.
Whole peeled tomatoes give you flexibility because you can chop, crush or blend them. Diced tomatoes provide pieces, while crushed tomatoes give a more sauce-like consistency. Cento’s guide to tomato forms describes these different uses.
Choose the form and ingredients that suit the recipe. A diced or crushed label is not, by itself, evidence that the product was made from inferior leftover tomatoes. There is no need to assume that whole tomatoes are always the better choice.
How To Substitute Canned Tomatoes For Fresh Ones?

For an ordinary cooked dish, first check how the recipe measures its tomatoes. A weight of drained tomatoes is different from the weight of a can that includes juice.
For example, Colavita lists one whole peeled tomato product as 400 g net weight and 240 g drained weight. These are two measurements of the same product. Neither tells you how many fresh tomatoes to buy, and the drained proportion is not a rule for other brands.
If the recipe gives a canned-tomato size and form, match those. If it asks for cups, measure the contents in the condition specified by the recipe, including whether to drain them. If it asks for a drained weight, drain and weigh the tomatoes.
If a fresh-tomato recipe gives no canned substitution, choose a version of the recipe that specifies canned tomatoes when you need a predictable result. Adding an entire can also adds its packing liquid, so a guessed fruit count can change the consistency of the dish.
These suggestions are for ordinary cooking. For home canning, follow a research-based preservation recipe rather than adapting the tomato form or proportions from this guide.
How Many Tomatoes Are In A Can Of Diced Tomatoes?
You cannot reliably work out the number of whole tomatoes from the weight of a diced product. The can contains cut pieces and may also contain juice or puree, so measure what your recipe actually calls for.
Check the ingredients if you want the pieces to soften into a sauce. Some products contain calcium chloride to help them keep their shape. It is not exclusive to diced tomatoes: Muir Glen lists it in both its diced and whole peeled tomatoes.
This does not mean that every diced product contains the additive or takes a fixed amount of extra cooking time. Choose the product for the texture you want, rather than assuming that smaller pieces will always break down faster.
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How Many Tomatoes Are In A Can Of Crushed Tomatoes?
Crushed tomatoes contain smaller pieces in a more sauce-like mixture. The amount of puree, texture and seasoning vary by product, so read the label rather than assuming that every can has the same consistency.
A 28 oz Red Gold crushed tomato product, for example, lists tomatoes, tomato puree and citric acid. Its 28 oz net weight is 1 lb 12 oz, not two pounds of fresh tomato flesh.
If you need a cup measurement, measure the product. A rounded serving count on a nutrition label is not an exact measured yield, and it cannot establish that a can was made from ten plum tomatoes.
How Many Tomatoes Are In A Can Of Tomato Paste?
Tomato paste is concentrated, so it serves a different purpose from whole, diced or crushed tomatoes. For example, Muir Glen offers a 6 oz paste made from cooked-down tomatoes, but the package weight does not tell you how many individual fruits were used.
Use paste when the recipe needs concentrated tomato flavor or a thicker tomato base. It does not supply the same amount of liquid or the same texture as fresh tomatoes or a can of diced tomatoes.
There is no reliable all-purpose rule that one tablespoon of paste replaces two tablespoons of strained canned tomatoes. Follow a recipe’s specific substitution instructions, including any added liquid, instead of treating the products as equal volumes.

