Diced Tomatoes
One US cup of diced tomatoes weighs between 240 and 260 grams (8.5 to 9.2 ounces), depending on the brand or product and which source measured it. That range is the answer; a single number would not be. Every figure behind it is below, with the method each source used.
Also called canned diced tomatoes, chopped tomatoes, canned chopped tomatoes, diced tomatoes in juice, petite diced tomatoes.
Most sites print one number for a cup of diced tomatoes. This page prints 240 to 260 grams, because that is what USDA SR Legacy "Tomatoes, red, ripe, canned, packed in tomato juice" (FDC 170051), USDA SR Legacy "Tomatoes, red, ripe, canned, packed in tomato juice, no salt added" (FDC 170138), Hunt's Diced Tomatoes (producer label), Red Gold Diced Tomatoes (producer label), Del Monte Diced Tomatoes (producer label) and Muir Glen Organic Diced Tomatoes (producer label) actually measured, and it names the method behind every figure rather than picking a favourite.
Two or more sources measured this kind of product and still disagree, by 8.3%. That is more than this site will average over, so all the figures stand and none is chosen. Sources span 240-260 g per cup, an 8.3% spread, over the 5% liquid tolerance. USDA's juice-packed records and the Hunt's and Red Gold labels measure 240-242 g; the Del Monte and Muir Glen labels give 252-260 g. Federal rules let canned tomatoes be packed in tomato juice or in puree or paste, and a heavier packing liquid weighs more per cup, so no single figure fits every can.
| Volume | Grams | Ounces |
|---|---|---|
| 1 cup | 240–260 g | 8.5–9.2 oz |
| 3/4 cup | 180–195 g | 6.3–6.9 oz |
| 2/3 cup | 160–173.3 g | 5.6–6.1 oz |
| 1/2 cup | 120–130 g | 4.2–4.6 oz |
| 1/3 cup | 80–86.7 g | 2.8–3.1 oz |
| 1/4 cup | 60–65 g | 2.1–2.3 oz |
| 1 tablespoon | 15–16.3 g | 0.53–0.57 oz |
| 1 teaspoon | 5–5.4 g | 0.18–0.19 oz |
| Filling the cup | 1 cup | Source |
|---|---|---|
| Standard, canned, undrained, poured and leveled | 240 g8.5 oz | USDA SR Legacy "Tomatoes, red, ripe, canned, packed in tomato juice" (FDC 170051) |
| Standard, canned, undrained, poured and leveled | 240 g8.5 oz | USDA SR Legacy "Tomatoes, red, ripe, canned, packed in tomato juice, no salt added" (FDC 170138) |
| Standard, canned, undrained, poured and leveled | 242 g8.5 oz | Hunt's Diced Tomatoes (producer label) |
| Standard, canned, undrained, poured and leveled | 242 g8.5 oz | Red Gold Diced Tomatoes (producer label) |
| Standard, canned, undrained, poured and leveled | 252 g8.9 oz | Del Monte Diced Tomatoes (producer label) |
| Standard, canned, undrained, poured and leveled | 260 g9.2 oz | Muir Glen Organic Diced Tomatoes (producer label) |
Diced Tomatoes ounces to grams and cups
| Weight | Grams | US cups |
|---|---|---|
| 1 oz | 28.3 g | 0.11–0.12 |
| 4 oz | 113.4 g | 0.44–0.47 |
| 8 oz | 226.8 g | 0.87–0.95 |
| 16 oz (1 lb) | 453.6 g | 1.74–1.89 |
Compared side by side
Tomato paste, puree, sauces, canned tomatoes, juice and ketchup compared: cup weights side by side, the source behind each, and why they differ.
Why this page publishes a range
A US cup of canned diced tomatoes, undrained, weighs 240 to 260 g (8.5 to 9.2 oz), depending on the brand. USDA and two brands measure 240-242 g, two other brands 252-260 g, and the 8% spread is too wide to publish one figure, so this entry publishes the range.
Diced tomatoes are tomato pieces canned in a packing liquid. The US standard for canned tomatoes (21 CFR 155.190) recognises whole, diced, sliced and wedge styles, and allows them to be packed in tomato juice or in tomato puree, pulp or paste. It also requires the drained tomatoes to fill at least half the can's capacity. So a can of diced tomatoes is part solid pieces and part liquid, and the liquid can be thin juice or something closer to puree.
USDA SR Legacy "Tomatoes, red, ripe, canned, packed in tomato juice" (FDC 170051) publishes 1 cup = 240 g and 1 tablespoon = 15 g, which agree with each other at 1.014 g/mL; the no-salt-added record (FDC 170138) is identical. Hunt's and Red Gold labels list half a cup at 121 g, 242 g per cup, within 1% of USDA. Del Monte lists half a cup at 126 g (252 g per cup) and Muir Glen Organic at 130 g (260 g per cup).
The physics explains the split. Tomato pieces and thin tomato juice are both mostly water, so a cup of pieces in juice weighs only a little more than a cup of water, which is what USDA's 1.014 g/mL describes. A packing liquid with more tomato solids is denser: tomato puree weighs 250 g per cup and paste 262 g. A can packed in a heavier liquid therefore weighs more per cup, and 252-260 g is what a thicker packing medium predicts. Brands do not print their packing liquid's solids content, which is why this entry names the range rather than guessing which can is in your cupboard.
USDA's stewed tomatoes record (FDC 170052) is a different product, cooked with onion, celery and pepper, at 255 g per cup; it is not used here.
Practical guidance: a standard 14.5-oz can holds 411 g, which is about 1 2/3 cups undrained. Drained, most of that is tomato: in Red Gold's foodservice specification 68 of every 102 ounces remain after draining, about two thirds, so if the same ratio holds for a retail can, a drained 14.5-oz can gives roughly 275 g of tomato pieces. When a recipe says "one can, drained", weighing the drained tomatoes is far more reliable than measuring them by the cup, because chunks leave gaps that liquid no longer fills.
King Arthur's ingredient weight chart has no row for diced or canned tomatoes. Its only tomato rows are tomato paste, a figure this site rejects, and dry-pack sun-dried tomatoes. The tomato products comparison page shows diced tomatoes beside paste, puree, sauce, crushed tomatoes and ketchup.
Sources
Standard, canned, undrained, poured and leveled — no single figure published
Sources span 240-260 g per cup, an 8.3% spread, over the 5% liquid tolerance. USDA's juice-packed records and the Hunt's and Red Gold labels measure 240-242 g; the Del Monte and Muir Glen labels give 252-260 g. Federal rules let canned tomatoes be packed in tomato juice or in puree or paste, and a heavier packing liquid weighs more per cup, so no single figure fits every can.
- USDA SR Legacy "Tomatoes, red, ripe, canned, packed in tomato juice" (FDC 170051)240 g per cup8.5 ozUSDA Standard Release publishes 1 cup = 240 g and 1 tbsp = 15 g, both giving density 1.014 g/mL. Covers canned tomato pieces in juice, undrained.
- USDA SR Legacy "Tomatoes, red, ripe, canned, packed in tomato juice, no salt added" (FDC 170138)240 g per cup8.5 ozUSDA Standard Release publishes 1 cup = 240 g, 1/2 cup = 120 g and 1 tbsp = 15 g, density 1.014 g/mL. Same figure as the salted record.
- Hunt's Diced Tomatoes (producer label)242 g per cup8.5 ozRetail nutrition label, 14.5-oz can: 1/2 cup (121 g), extrapolating to 242 g per US cup and density 1.023 g/mL.
- Red Gold Diced Tomatoes (producer label)242 g per cup8.5 ozRetail nutrition label, 14.5-oz can: 1/2 cup (121 g), extrapolating to 242 g per US cup and density 1.023 g/mL. Red Gold's foodservice 1-inch diced specification lists the same serving and a drained weight of 68 oz per 102-oz can.
- Del Monte Diced Tomatoes (producer label)252 g per cup8.9 ozRetail nutrition label, 14.5-oz can: 1/2 cup (126 g), extrapolating to 252 g per US cup and density 1.065 g/mL.
- Muir Glen Organic Diced Tomatoes (producer label)260 g per cup9.2 ozBrand nutrition panel: 1/2 cup (130 g), extrapolating to 260 g per US cup and density 1.099 g/mL. The heaviest figure found.
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