How Many Carbohydrates Are In Tomatoes? | Carb Counts

One medium tomato has about 4.8 grams of carbs, with much of that coming from water, fiber, and natural sugar.

Tomatoes are one of the easier foods to count. They taste sweet, but they’re still mostly water. That keeps the carb count modest compared with bread, rice, potatoes, fruit juice, or sweet sauces.

The number changes with size, ripeness, variety, and prep. A cherry tomato may barely move your log. A cup of chopped tomato counts more. Paste and thick sauce climb faster because much of the water has been cooked out.

How Many Carbohydrates Are In Tomatoes? By Serving

A medium raw tomato has about 4.8 grams of total carbohydrate. A small tomato has about 3.5 grams. A large tomato has about 7 grams. For quick counting, treating one medium tomato as a 5-gram carb item works well.

That number is total carbs, not net carbs. Total carbs include fiber. Net carbs usually means total carbs minus fiber, so a medium tomato lands near 3.3 grams of net carbs. Labels in the United States show total carbohydrate, so total carbs are the safer number when you’re matching a food log to a package.

Why Serving Size Changes The Count

Tomatoes don’t all weigh the same. A dense beefsteak tomato can be twice the size of a small salad tomato. Grape tomatoes and cherry tomatoes are easier to count by piece, but chopped tomato is better measured by cup or by grams.

For raw red tomatoes, 100 grams is the clean baseline. That amount has 3.89 grams of total carbohydrate and 1.2 grams of fiber in USDA FoodData Central tomato data. Once you know that, the math is simple: more tomato weight means more carbs.

What Counts As Carbs In Tomatoes?

The carbohydrate in tomatoes comes from natural sugars, tiny traces of starch, and fiber. The sweet taste mostly comes from glucose and fructose. The fiber sits in the flesh, peel, and seeds, which is why whole tomato feels more filling than strained juice.

Fiber is still counted inside total carbohydrate on a label. The FDA lists total carbohydrate and dietary fiber among required Nutrition Facts label lines, and its Daily Value table sets total carbohydrate at 275 grams per day for a 2,000-calorie label pattern.

Total Carbs Vs. Net Carbs

Total carbs include every carb gram in the tomato. Net carbs subtract fiber. So, a medium tomato with about 4.8 grams total carbs and about 1.5 grams fiber lands near 3.3 grams net carbs.

The gap is small, but it can matter when meals are counted tightly. Pick one method and stick with it. Switching between total and net carbs makes your daily numbers messy.

Raw, Cooked, And Canned Tomatoes

Cooking does not add carbs by itself. The carb count rises per spoonful when water leaves the pan. That is why simmered sauce tastes richer and reads higher per cup than diced raw tomato.

Canned tomatoes are often close to raw tomatoes when the can contains tomatoes and juice only. The label is the judge. Watch for added sugar in jarred pasta sauce, ketchup, barbecue-style sauces, and sweet tomato chutneys.

Tomato Carbs In Common Portions And Prep Styles

Use this table as a practical reference. Values are rounded from the raw 100-gram baseline when needed, so brand labels may vary. Canned and cooked items can shift with added sugar, salt, oil, or water loss.

Tomato Amount Or Product	Total Carbs	Useful Note
1 cherry tomato, about 17 g	0.7 g	Small bite for salads, snacks, and skewers.
1 small tomato, about 91 g	3.5 g	Fits easily beside eggs, tuna, or cottage cheese.
1 medium tomato, about 123 g	4.8 g	A common whole-tomato serving for sandwiches.
1 large tomato, about 182 g	7.1 g	Better counted when carbs are tracked closely.
1 cup chopped raw tomato, about 180 g	7.0 g	Good for salsa, salads, bowls, and omelets.
100 g raw red tomato	3.9 g	Clean reference point for kitchen scale math.
1 tablespoon tomato paste	Near 3 g	Concentrated, so small amounts add up sooner.
1/2 cup tomato sauce	Often 7-10 g	Check labels for added sugar and serving size.

Are Tomatoes Low-Carb Friendly?

Yes, tomatoes can fit low-carb meals in normal portions. The American Diabetes Association lists tomato among common non-starchy vegetables, and its non-starchy vegetable list places tomato with lower-carb vegetable choices.

That does not make every tomato product low-carb. Fresh tomato slices, pico de gallo, and plain canned tomatoes are easy to count. Sweet sauce, ketchup, and paste-heavy recipes need closer label reading.

Simple Ways To Keep Tomato Carbs In Check

• Use fresh tomato for volume, then add herbs, lemon, vinegar, pepper, or chili for bite.
• Pick canned tomatoes with no added sugar when making soup or sauce.
• Measure paste by the tablespoon instead of scooping from the tube or can.
• Pair tomatoes with protein or fat, like eggs, fish, chicken, beans, cheese, or olive oil.
• Count sauce by the serving on the label, not by the jar.

Good Tomato Choices For Different Meals

The right tomato choice depends on what you’re making. Fresh tomatoes give the most plate volume for the carb count. Paste gives the strongest flavor in the smallest space. Sauce sits between those two, but labels can swing widely.

Meal Goal	Tomato Pick	Why It Works
Lowest carb volume	Fresh slices or chopped raw tomato	High water content keeps the serving light.
Bold flavor with measured carbs	Tomato paste by tablespoon	Strong taste, but easy to overpour.
Meal prep	No-sugar-added canned diced tomatoes	Stable pantry item with simple label math.
Salads and snacks	Cherry or grape tomatoes	Easy portions with less cutting.
Pasta night	Unsweetened marinara, measured	Works when the serving size stays honest.

How To Count Tomatoes In Your Meal

If you don’t want to weigh every tomato, use a simple shortcut. Count a medium tomato as 5 grams total carbs. Count a cup of chopped raw tomato as 7 grams. Count a cherry tomato as under 1 gram. Those numbers are close enough for day-to-day tracking.

When Accuracy Matters More

A kitchen scale helps when you’re working with a strict carb target. Weigh the edible tomato portion, then use 3.9 grams of total carbs per 100 grams. For net carbs, subtract 1.2 grams of fiber per 100 grams.

For packaged tomato foods, don’t rely on color or thickness. Read total carbohydrate, dietary fiber, added sugars, and serving size. Two sauces can look alike, yet one may carry more sugar per half cup.

Final Takeaway On Tomato Carbs

Tomatoes are a low-carb vegetable for most plates, especially when eaten raw or canned without added sugar. A medium tomato has about 4.8 grams of total carbs, while a cup of chopped tomato has about 7 grams.

The biggest carb jumps come from concentration and sweeteners. Fresh tomatoes, plain canned tomatoes, and measured sauce portions give you flavor without turning a meal into a carb-heavy one. For daily tracking, the simple 5-gram medium-tomato estimate works well; for strict plans, weigh the tomato and run the 100-gram math.