Pantry Staples
Diced Tomatoes (Canned) Conversion
Diced Tomatoes (Canned) weighs 240g per US cup.
| Amount | Grams | Ounces |
|---|---|---|
| 1 cup | 240.0 g | 8.47 oz |
| 1/2 cup | 120.0 g | 4.23 oz |
| 1/4 cup | 60.0 g | 2.12 oz |
| 1 tbsp | 15.0 g | 0.53 oz |
| 1 tsp | 5.0 g | 0.18 oz |
| 100 g | 100.0 g | 3.53 oz |
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Canned diced tomatoes weigh 240 grams per cup, including both the tomato pieces and the packing liquid they're canned in, since most recipes use both together rather than draining the liquid away.
Canned tomatoes are picked and canned at peak ripeness, often within hours of harvest, which is exactly why many cooks and recipe developers reach for canned diced tomatoes over fresh ones in an off-season sauce or stew — a fresh tomato in winter is typically picked underripe and shipped long distances, while a can preserves a tomato's flavor from the height of its actual growing season.
"Fire-roasted" diced tomatoes, a common variant, have been charred before canning to add a smoky depth that plain diced tomatoes don't have — a genuinely different flavor profile worth choosing deliberately rather than treating fire-roasted and standard diced tomatoes as interchangeable in a recipe where that smokiness would clash.
A wooden or plastic spoon, rather than metal, is sometimes preferred when stirring a simmering pot given the tomatoes' natural acidity.
The canning process itself, not the pantry temperature, is what gives diced tomatoes their multi-year shelf life — commercial canning heats them enough to destroy the enzymes and microorganisms that would otherwise cause spoilage, so the can just needs to stay sealed and undamaged.
A shakshuka, eggs poached directly in a spiced tomato sauce, is a popular way to use a can of diced tomatoes as the base for a quick, hearty breakfast or dinner.
San Marzano tomatoes, a specific Italian variety often used for premium canned diced or whole tomato products, are prized for a lower acidity and sweeter flavor than a standard commodity tomato, a genuine varietal difference reflected in their higher price.
Draining canned diced tomatoes before adding them to a dish that shouldn't turn watery, like a pizza topping or a dry-braised dish, is a simple technique worth using deliberately rather than dumping the can in with all its liquid by default.
How long does it last?
Storage & shelf life →
Frequently asked questions
Does the 240g figure include the canning liquid?
Yes — it reflects diced tomatoes with their packing liquid included, since most recipes use both together rather than draining the tomatoes first; draining would reduce the weight per cup somewhat.
Why do many cooks prefer canned tomatoes to fresh in cooked dishes?
Canned tomatoes are typically picked and processed at peak ripeness, often within hours, giving them a more consistent, developed flavor than an off-season fresh tomato that was likely picked underripe for shipping — a real quality advantage for cooked dishes outside tomato season.
What's the difference between fire-roasted and regular diced tomatoes?
Fire-roasted tomatoes are charred before canning, adding a smoky depth of flavor that plain diced tomatoes don't have — a genuinely different flavor profile, not just a marketing distinction, worth choosing deliberately based on the dish.
Can crushed tomatoes substitute for diced tomatoes?
It works in many recipes, though crushed tomatoes have a smoother, more sauce-like texture with no distinct tomato chunks, so a dish specifically wanting visible tomato pieces (like a chunky salsa or a rustic sauce) will look and feel different with crushed tomatoes instead.
Are canned tomatoes as nutritious as fresh?
Yes, generally — canning preserves most of a tomato's nutritional content well, and in some respects (like lycopene availability) canned and cooked tomatoes can even be more bioavailable than raw fresh tomatoes.