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Calories in Tomato

Q: How many calories in a tomato?

Tomatoes contain 18 calories per 100g. A medium tomato (123g) has 22 calories. A large tomato (182g) has 33 calories. A cup of chopped tomatoes (180g) has 32 calories. Use the slider above for any weight.

Updated July 2026 · Reviewed by CaloriesCalc Team · Source: USDA FoodData Central

kcal

per 100g

3.89

Carbs

0.88

Protein

0.2

Fat

1.2

Fiber

kcal per medium tomato (123g)

kcal per large tomato (182g)

kcal per oz (28g)

✔ Very low calorie — 18 kcal/100g✔ Rich in lycopene✔ Good vitamin C✔ Fat free✔ Gluten free✔ Vegan

Tomato nutrition facts and calories per 100g

🔴Rich in lycopene — most bioavailable when cooked

🛡Good vitamin C — 13.7mg per 100g

⚡Potassium — 237mg per 100g

💧95% water — very hydrating

🔥Only 18 kcal per 100g

❤️Linked to reduced prostate cancer risk

🍅 Calculate Calories for Any Tomato Weight

Weight100g

Nutrition Facts

Per 100g (raw tomato)

* % Daily Value based on a 2,000 kcal diet.

Quick summary: Tomatoes contain just 18 calories per 100g — one of the lowest of any food. They are the richest dietary source of lycopene, a carotenoid linked to 35% lower prostate cancer risk in large studies. Lycopene bioavailability is 2–3× higher from cooked tomatoes. With only 2.7g of net carbs, tomatoes are suitable for keto, diabetic, and virtually all dietary patterns.

Vitamins & Minerals — per 100g

Nutrient	Amount	% Daily Value
Lycopene	2573 µg	—
Vitamin C	13.7 mg	15%
Potassium	237 mg	5%
Vitamin K	7.9 µg	7%
Vitamin A (RAE)	42 µg	5%
Folate (B9)	15 µg	4%
Vitamin B6	0.08 mg	5%
Magnesium	11 mg	3%
Phosphorus	24 mg	2%
Calcium	10 mg	1%

Calories in Tomato by Weight

Weight	Calories	Carbs	Protein	Fat

Calories in Different Tomato Servings

Serving	Weight	Calories	Carbs	Net Carbs	Fat
1 cherry tomato	17g	3 kcal	0.7g	0.6g	0.0g
⭐ 1 medium tomato	123g	22 kcal	4.8g	3.3g	0.2g
1 large tomato	182g	33 kcal	7.1g	4.9g	0.4g
1 cup chopped	180g	32 kcal	7.0g	4.8g	0.4g
1 oz	28g	5 kcal	1.1g	0.8g	0.1g

Macronutrient Breakdown — per 100g

Carbohydrates3.89g · 78% of calories

Protein0.88g · 20% of calories

Fat0.2g · 10% of calories

Fiber1.2g (included in carbs)

Tomato is 95% water — one of the highest water content vegetables. Net carbs are 2.7g per 100g — extremely low. This makes tomato suitable for almost any dietary pattern including keto.

Micronutrient Highlights

🔴

Lycopene

2573 µg

Carotenoid

Most powerful dietary antioxidant for prostate health

🛡

Vitamin C

13.7 mg

15% Daily Value

Immune support and collagen synthesis

⚡

Potassium

237 mg

5% Daily Value

Blood pressure and heart function

👁

Vitamin A (RAE)

42 µg

5% Daily Value

Vision and immune function

🌿

Fiber

1.2 g

4% Daily Value

Digestive health

🔬

Vitamin K

7.9 µg

7% Daily Value

Blood clotting and bone health

Tomato Health Benefits & Nutrition

Lycopene — Cancer-Fighting Antioxidant

Tomatoes are the richest dietary source of lycopene — a carotenoid with powerful antioxidant properties. A landmark Harvard study of 47,000 men found that eating tomato-based foods more than twice weekly reduced prostate cancer risk by 35%. Crucially, lycopene is significantly more bioavailable from cooked tomatoes than raw — heating breaks down cell walls and concentrates lycopene, while fat further increases absorption. Tomato sauce, paste, and sun-dried tomatoes have 3–5× more lycopene than fresh tomatoes.

Heart Health

Tomatoes are strongly associated with cardiovascular protection. Lycopene reduces LDL oxidation — the key step in arterial plaque formation. A meta-analysis of 21 studies found that high tomato intake was associated with 14% lower cardiovascular disease risk. The combination of lycopene, potassium, vitamin C, and flavonoids (quercetin, kaempferol) provides multi-pathway cardiovascular protection.

Vitamin C and Skin Health

A medium tomato provides 17mg of vitamin C — 19% of the daily requirement. Vitamin C is essential for collagen synthesis and photoprotection. Tomatoes also contain beta-carotene and lycopene, both of which provide UV photoprotection when consumed regularly. Studies show high tomato consumption measurably reduces UV-induced skin reddening.

Blood Sugar Friendly

With only 18 kcal per 100g and 2.7g of net carbs, tomatoes have an extremely low glycemic index (~15). Chromium in tomatoes helps regulate blood sugar, and naringenin — a flavonoid found in tomatoes — has shown anti-diabetic properties in research. Tomatoes are one of the few foods freely consumed on virtually all therapeutic diets including keto, diabetic, and weight loss protocols.

Tomato vs Other Vegetables — Calorie Comparison

Is Tomato Suitable for Your Diet?

✅

Weight loss

Excellent — only 18 kcal/100g

✅

Keto

Yes — 2.7g net carbs

✅

Vegan

Yes

✅

Paleo

Yes

✅

Gluten-free

Yes

✅

Diabetic

Yes — GI ~15

✅

Low-FODMAP

Yes

✅

Mediterranean

Core ingredient

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Frequently Asked Questions

How many calories in a tomato?

Tomatoes contain 18 calories per 100g. A medium tomato (123g) has 22 calories. A large tomato (182g) has 33 calories. A cup of chopped tomatoes (180g) has 32 calories. Use the slider above for any weight.

Is tomato a fruit or vegetable?

Botanically, tomato is a fruit (it develops from a flower and contains seeds). Culinarily and legally, it is classified as a vegetable in most countries. The US Supreme Court ruled in 1893 that tomatoes are vegetables for trade purposes. For nutrition purposes, it makes no difference.

Are cooked tomatoes healthier than raw?

For lycopene — yes. Cooking breaks down cell walls, making lycopene 2–3× more bioavailable. Eating tomatoes with fat (olive oil) further increases lycopene absorption by 4×. For vitamin C — raw is better, as heat degrades some vitamin C. Overall, both raw and cooked tomatoes are excellent; variety is ideal.

Is tomato keto?

Yes. Tomatoes have only 2.7g of net carbs per 100g and 18 kcal. A medium tomato has just 3.3g of net carbs, making them compatible with ketogenic diets in normal serving sizes.

How much lycopene is in a tomato?

A medium raw tomato contains approximately 3,165µg of lycopene. Cooked tomato products are much higher: tomato paste has ~42,000µg/100g, tomato sauce ~15,000µg/100g. Eating tomato-based cooked foods provides substantially more bioavailable lycopene than fresh tomatoes.

Do tomatoes lower blood pressure?

Evidence suggests yes. A 2006 study found that tomato extract supplementation reduced systolic blood pressure by 10 mmHg in hypertensive patients. The effect is attributed to lycopene reducing oxidative stress in blood vessel walls, combined with potassium's natriuretic effect. Regular tomato consumption is associated with lower blood pressure in population studies.

Sources

Nutrition values sourced from USDA FoodData Central. Not medical advice.