Tomato Calories & Nutrition Facts
Rich in lycopene antioxidant that reduces cancer risk and supports heart health.
Quick answer
How many calories are in Tomato?
Tomato has 18 calories per 100g. A 1 medium whole (2-3/5" dia) (123g) has about 22 calories. It is a low-calorie food, with most calories coming from carbs.
Start with your portion
Turn Tomato into a daily plan
Practical Portion Guide for Tomato
| Portion | Calories | Protein | Carbs | Net carbs | Fat |
|---|---|---|---|---|---|
| 1 medium whole (2-3/5" dia) (123g) | 22 kcal | 1.1g | 4.8g | 3.3g | 0.2g |
| 1 cup cherry tomatoes (149g) | 27 kcal | 1.3g | 5.8g | 4.0g | 0.3g |
| 1 cup, chopped or sliced (180g) | 32 kcal | 1.6g | 7.0g | 4.9g | 0.4g |
| 100g USDA reference | 18 kcal | 0.9g | 3.9g | 2.7g | 0.2g |
Use gram-based portions when precision matters, especially during weight loss or macro tracking.
% Daily Value: 1 medium whole (2-3/5" dia) (123g) vs 100g
Percent Daily Values use the FDA reference amounts for adults (protein 50g, fiber 28g, carbohydrate 275g, fat 78g, sodium 2,300mg, cholesterol 300mg, potassium 4,700mg). The FDA label guide treats 20% DV or more per serving as high and 5% DV or less as low. Potassium comes from USDA FoodData Central FDC ID 170457 (Tomatoes, red, ripe, raw, year round average); the other values are this page's 100g reference scaled to the portion.
| Nutrient | Per 100g | % DV | 1 medium whole (2-3/5" dia) (123g) | % DV |
|---|---|---|---|---|
| Protein | 0.9g | 2% | 1.1g | 2% |
| Dietary fiber | 1.2g | 4% | 1.5g | 5% |
| Total carbohydrate | 3.9g | 1% | 4.8g | 2% |
| Total fat | 0.2g | 0% | 0.2g | 0% |
| Sodium | 5mg | 0% | 6mg | 0% |
| Cholesterol | 0mg | 0% | 0mg | 0% |
| Potassium (USDA) | 237mg | 5% | 292mg | 6% |
Source: FDA Daily Values (21 CFR 101.9), checked September 17, 2026. USDA record: FDC ID 170457.
Serving Size Calculator
Macros Breakdown (per 100g)
Diet Suitability
Glycemic Index: 30 (Low)
How Tomato Fits Into a Diet
Tomato can fit a balanced diet when portioned against your calorie and macro targets.
Build meals around protein, fiber, and minimally processed ingredients to make the portion more filling.
Preparation method, brand, and added ingredients can change the final nutrition values.
Plan Around Tomato
Zero-Calorie Foods Guide
Use low-calorie vegetables like Tomato to increase meal volume.
Calorie Deficit Calculator
Estimate the daily calorie target that turns low-calorie foods into a real plan.
Keto Diet Guide
Check how low-carb foods like Tomato fit within a ketogenic day.
Calorie Calculator
Calculate your daily intake target before choosing serving sizes.
Compare Tomato With Similar Vegetables
Use this comparison when choosing a serving. Calories alone do not tell the full story: protein, fiber, fat, sodium, and realistic portion size determine whether a food fits your plan.
| Food | Calories | Protein | Carbs | Fat | Fiber |
|---|---|---|---|---|---|
| Tomato | 18 kcal | 0.9g | 3.9g | 0.2g | 1.2g |
| Broccoli | 34 kcal | 2.8g | 7g | 0.4g | 2.6g |
| Spinach | 23 kcal | 2.9g | 3.6g | 0.4g | 2.2g |
| Carrot | 41 kcal | 0.9g | 10g | 0.2g | 2.8g |
| Cucumber | 15 kcal | 0.7g | 3.6g | 0.1g | 0.5g |
| Sweet Potato | 86 kcal | 1.6g | 20g | 0.1g | 3g |
All comparison values use each food's 100-unit reference so foods can be compared on the same basis.
Vitamins & Minerals
Vitamins
Minerals
Complete Nutrition Facts (per 100g)
% DV = percent of the FDA Daily Value for a 2,000-calorie diet, per 100g. Total sugars have no Daily Value; the FDA value applies to added sugars only.
Methodology & Nutrition Data Sources
How we calculate nutrition data for Tomato: Calorie and macronutrient values are standardized reference profiles, generally based on USDA FoodData Central entries where available, then scaled to the serving you choose. Entries may come from different FDC data types or releases, and brand or preparation differences can change the numbers.
- Calorie and macronutrient data sourced from the USDA FoodData Central , the federal food composition database used as the main reference where a matching entry exists.
- Daily Value context: for % DV comparisons, use the FDA Daily Value reference amounts for a 2,000 calorie diet (21 CFR 101.9).
- Dietary reference intakes (DRI) for vitamins and minerals are available in the National Academies Dietary Reference Intake tables for further reading; this page does not calculate DRI percentages.
- Glycemic index values are approximate listed values; GI varies by variety, ripeness, and preparation, so compare with the Harvard Health Glycemic Index Reference and the University of Sydney GI database.
- Dietary guidelines context from the HHS/USDA Dietary Guidelines for Americans 2020–2025 , the federal evidence-based nutrition guidance.
Authoritative nutrition data sources:
- USDA FoodData Central, comprehensive food composition database
- FDA Nutrition Facts Label rules, % Daily Value methodology
- NIH Office of Dietary Supplements, vitamin and mineral research
- CDC Nutrition, Public Health Guidance, chronic disease and diet
- HHS/USDA Dietary Guidelines 2020–2025, federal nutrition recommendations
- Harvard T.H. Chan School of Public Health, The Nutrition Source, evidence-based dietary guidance
Nutrition Disclaimer: Calorie and nutrient values are generally based on USDA reference data and may vary by brand, preparation method, ripeness, and cooking technique. These values are for informational purposes only and should not replace personalized dietary advice from a registered dietitian. Individuals with medical conditions should consult a healthcare provider before making significant dietary changes.
Reviewed by Priya Lindqvist · Last updated September 17, 2026 · Values may not reflect the newest USDA FoodData Central release
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Frequently Asked Questions
How many calories are in 1 medium whole (2-3/5" dia) Tomato?
1 medium whole (2-3/5" dia) (123g) of Tomato has about 22 calories, 1.1g protein, 4.8g carbohydrates, 1.5g fiber, and 0.2g fat. The 123g portion weight is the USDA FoodData Central household measure for FDC ID 170457 (Tomatoes, red, ripe, raw, year round average), scaled from the 100g reference values.
Is Tomato high in protein?
Tomato has 0.9g protein per 100g, which is 2% of the 50g FDA Daily Value. 1 medium whole (2-3/5" dia) (123g) supplies about 1.1g, or 2% DV. Under the FDA label guide (20% DV or more per serving is high, 5% or less is low), that serving counts as a low-protein serving.
Is Tomato a good source of potassium?
USDA FoodData Central lists 237mg potassium per 100g for Tomatoes, red, ripe, raw, year round average (FDC ID 170457), which is 5% of the 4,700mg Daily Value. 1 medium whole (2-3/5" dia) (123g) provides about 292mg, or 6% DV.
How many calories are in Tomato?
Tomato contains 18 calories per 100g serving. Using general 4-4-9 calorie factors, that is roughly 4 calories from protein, 16 calories from carbohydrates, and 2 calories from fat; these estimates may not add up exactly to the listed total.
Is Tomato good for weight loss?
Yes, Tomato is excellent for weight loss with only 18 calories per 100g. It is low in calories and can help you feel satisfied while maintaining a calorie deficit.
How much protein is in Tomato?
Tomato contains 0.9g of protein per 100g. This is a relatively low protein food; consider pairing it with higher protein sources.
What serving size should I track for Tomato?
Track Tomato by grams when precision matters. A practical starting point is 1 medium whole (2-3/5" dia) (123g), which is about 22 calories. For packaged, restaurant, fried, sauced, or sweetened versions, use the product label because brand formulas can differ from the plain reference.
Is Tomato keto-friendly?
Yes, Tomato is keto-friendly with only 3.9g of carbohydrates per 100g. It fits well within the typical keto macro limits of 20-50g net carbs per day.
Is Tomato good for diabetics?
Tomato may fit a diabetes meal plan with a listed glycemic index of 30, but the useful decision is the actual portion, total carbohydrates, added sugar, and the rest of the meal. People using diabetes medication should follow personalized clinical guidance.
What vitamins and minerals are in Tomato?
Calorique's food profile lists vitamins C, K, A, B6, Folate and minerals including Potassium, Manganese for Tomato. These are general highlights, not measured amounts or a "good source" rating; check USDA FoodData Central or the product label for exact micronutrient values.
Where does Calorique get nutrition data for Tomato?
Calorique standardizes Tomato nutrition values per 100g using USDA FoodData Central reference fields where available, then scales the data into realistic serving sizes. FDA Nutrition Facts methodology and authoritative nutrition references are used for context. This page was last reviewed September 17, 2026.
Related Calculators
Broccoli
34 cal · 2.8g protein per 100g
Spinach
23 cal · 2.9g protein per 100g
Carrot
41 cal · 0.9g protein per 100g
Cucumber
15 cal · 0.7g protein per 100g
Sweet Potato
86 cal · 1.6g protein per 100g
Bell Pepper (Red)
31 cal · 1g protein per 100g
Kale
49 cal · 4.3g protein per 100g
Cauliflower
25 cal · 1.9g protein per 100g