How Much Sugar In a Tomato? | Sweetness In Plain Numbers

A medium raw tomato has about 3 grams of natural sugar, while 100 grams of tomato has about 2.6 grams.

Tomatoes taste sweet enough to notice, yet they’re still one of the lower-sugar foods in the produce aisle. That’s why this question comes up so often. People want a straight number, not a vague “it depends.”

Here’s the simple answer: a raw tomato is not sugar-heavy. A standard medium tomato lands at roughly 3 grams of sugar, and smaller or larger tomatoes move that number up or down. The sweetness you taste comes from natural sugars already in the fruit, not from added sweeteners.

That last part matters. On the FDA page on added sugars, naturally occurring sugars in fruits and vegetables are treated differently from sugars added during processing. So when you eat a plain tomato, you’re getting natural sugar, not added sugar.

How Much Sugar In a Tomato? Portion Sizes That Matter

The number changes with size, variety, and how much you actually eat. A slice on a burger is one thing. A bowl of cherry tomatoes is another. That’s why portion size tells a better story than a single one-line number.

Using values based on USDA FoodData Central tomato entries, raw tomato averages about 2.6 grams of sugar per 100 grams. From there, you can scale the number to match what’s on your plate.

A few quick takeaways help put that in context:

• One thick tomato slice has well under 1 gram of sugar.
• One medium whole tomato is usually around 3 grams.
• One cup of chopped tomato often lands near 4 grams.
• Cherry and grape tomatoes stay low per piece, though the total climbs fast if you snack on a lot of them.

That means tomatoes can taste sweet without pushing your sugar intake very far. Their water content is high, so the sugar is spread through a food that is light, juicy, and low in calories.

Why Tomatoes Can Taste Sweeter Than The Number Suggests

Taste doesn’t always match the label in your head. Tomatoes carry acidity along with sugar, and that balance changes how sweet they seem. A ripe summer tomato can taste richer than a supermarket tomato even when the sugar gap is small.

Variety also changes the feel of sweetness. Cherry tomatoes often seem sweeter because they pack flavor into a smaller bite. Beefsteak tomatoes can taste milder and juicier. Roma tomatoes may feel denser and less sweet when raw, though they often taste richer once cooked down.

Ripeness matters too. A green or under-ripe tomato usually tastes sharper. As it ripens, the sugar becomes easier to notice. So if two people give two different answers about sweetness, they may both be right for the tomato they ate.

Sugar In Common Tomato Serving Sizes

If you want a number you can use while cooking, meal planning, or tracking food, this table gives a clearer range than a one-size-fits-all answer.

Tomato serving	Approximate amount	Sugar
1 thin slice	15 g	0.4 g
1 thick slice	25 g	0.7 g
1 plum or Roma tomato	60 g	1.6 g
1 small tomato	90 g	2.4 g
1 medium tomato	120 g	3.1 g
1 large tomato	180 g	4.7 g
1 cup chopped tomato	150 g	3.9 g
5 cherry tomatoes	85 g	2.2 g

Those numbers are close enough for everyday use. Real tomatoes vary by variety, growing conditions, ripeness, and water content, so the total is never pinned to one perfect figure. Still, the range stays modest.

What This Means If You Track Sugar

If you count sugar grams, tomatoes usually fit with ease. Even a full medium tomato gives you only a few grams. That’s a lot different from juice, soda, sweetened yogurt, or dessert.

If you follow a lower-carb way of eating, tomatoes still tend to work well in normal portions. The sugar is there, sure, but it comes along with fiber, water, and a low calorie load. For most people, the amount in sliced tomatoes, salads, salsa, or omelets is small enough that it barely moves the day’s total.

That said, portions can sneak up when tomatoes are concentrated. A couple slices on a sandwich are tiny in sugar terms. A big bowl of roasted cherry tomatoes, or a thick reduction made from several cups, stacks the grams faster because you’re eating more tomato in less space.

Fresh Tomatoes Vs Tomato Products

The plain raw tomato is one thing. Processed tomato foods can be another story. Some are still close to the original food. Others pick up extra sugar during processing.

That’s where labels matter. The FDA Daily Value page lists 50 grams as the Daily Value for added sugars on a 2,000-calorie diet. Raw tomatoes do not come with added sugar. Ketchup, sweet pasta sauce, barbecue sauce, and some canned products may.

So if your real question is “Will tomatoes raise my sugar intake much?” the answer for fresh tomatoes is usually no. If your real question is “Will tomato-based foods do that?” then you need to check the label or recipe.

Tomato food	What changes	Sugar note
Raw tomato	High water content	Natural sugar stays low
Cherry tomatoes	Smaller, denser flavor	Low per piece, easy to eat many
Canned tomatoes	Close to fresh if plain	Check label for added sugar
Tomato sauce	More concentrated	Natural sugar per spoonful may rise
Pasta sauce	Seasoned product	Some jars include added sugar
Ketchup	Condiment, not plain tomato	Often much sweeter

Does Cooking Change The Sugar In Tomatoes?

Cooking doesn’t dump sugar into a tomato by itself. What it often does is remove water. Once water cooks off, the tomato tastes sweeter and richer because the flavor is more concentrated.

That can fool your taste buds. A spoonful of tomato paste feels sweeter than a slice of fresh tomato, even if the food started from the same raw ingredient. You’re just getting more tomato in a smaller bite.

If sugar content matters to you, think in total amount eaten, not sweetness alone. A roasted tray of tomatoes may taste sweeter than a salad, though the total still comes from the tomatoes you used.

Best Way To Think About Tomato Sugar

The cleanest way to answer this topic is to separate fresh tomatoes from sweetened tomato products. Fresh tomatoes are low in sugar. A medium one gives you around 3 grams, which is a small amount for a whole food that brings plenty of volume and flavor.

That makes tomatoes easy to fit into salads, sandwiches, wraps, eggs, grain bowls, and cooked dishes. If you’re choosing between a tomato and a sweet snack, the gap is huge. If you’re choosing between a plain tomato and ketchup, read the label because they’re not playing the same game.

So yes, tomatoes contain sugar. They just don’t contain much of it. For most people, the bigger question isn’t the tomato itself. It’s what gets mixed with it in sauces, bottled dressings, and condiments.