On average, four diced Roma tomatoes will equal one cup. One cup of diced Roma tomatoes contains 40 calories and 0 grams of fat.
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Approximately 6-7 pounds of tomatoes equal 3 quarts.
It depends on the size of the medium tomatoes, but on average, about 2 to 3 medium tomatoes would equal one pound.
Cups are a measurement for size where as ounces is weight. So the answer varies by brand and product. The best way to figure it out is to look at the back of the can and see the suggested serving sizes which is usually written in cup measurements. If looking to replace a can one and a quarter cups of diced fresh tomatoes and one cup of liquid will do the trick.
There are 8oz. in 1 cup, so that would make 96 oz. in 12 cups.
Approximately 8-10 fresh tomatoes would be equivalent to a 28 ounce can.