Tomato glycemic index
Tomato has a glycemic index of 23, which is low. A 120 g serving (1 medium tomato) has a glycemic load of <1 (low).
Also known as: tomatoes
- Serving120 g
- Available carbs3.2 g
- Fiber1.4 g
- Sugars3.2 g
- Protein1.1 g
- Calories22 kcal
Serving: 1 medium tomato.
What to know
Tomatoes are very low in carbohydrate, so their glycemic load is close to zero. Ketchup and sweetened pasta sauces are a different story because of the added sugar.
Glycemic load by portion size
GI stays the same whatever you eat, but glycemic load scales with the amount: eating twice as much doubles the effect on blood sugar.
| Amount | Available carbs | Glycemic load | |
|---|---|---|---|
| 50 g | 1.4 g | <1 | Low |
| 100 g | 2.7 g | <1 | Low |
| 120 g · 1 medium tomato | 3.2 g | <1 | Low |
| 240 g · double serving | 6.5 g | 1 | Low |
What the studies found
The value comes from a single published measurement in the International Tables of Glycemic Index (2021), so treat it as a guide.
Tomato compared with other vegetables & tubers
Similar low-GI foods
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Frequently asked questions
Is tomato low glycemic?
Yes. With a GI of 23, tomato is in the low range (55 or less).
What is the glycemic load of tomato?
A 120 g serving (1 medium tomato) has a glycemic load of <1, which is low. Glycemic load combines GI with the amount of carbohydrate in the portion: 10 or less is low, 11 to 19 medium and 20 or more high.
Can people with diabetes eat tomato?
With a GI of 23 and a low glycemic load per serving, tomato usually fits a diabetes-friendly diet in normal portions. Everyone responds differently, so talk to your doctor or dietitian about your plan.
How many carbs are in tomato?
A 120 g serving has about 4.7 g of total carbohydrate, including 1.4 g of fiber, leaving 3.2 g of available carbohydrate (the part that raises blood sugar). Per 100 g: 3.9 g of carbohydrate.
Nutrition facts
| per 100 g | Serving (120 g) | |
|---|---|---|
| Calories | 18 kcal | 22 kcal |
| Carbohydrates | 3.9 g | 4.7 g |
| Available carbs | 2.7 g | 3.2 g |
| Fiber | 1.2 g | 1.4 g |
| Sugars | 2.6 g | 3.2 g |
| Protein | 0.9 g | 1.1 g |
| Fat | 0.2 g | 0.2 g |
Source: USDA FoodData Central, Tomatoes, red, ripe, raw, year round average (SR Legacy, FDC 170457). Available carbohydrate = total carbohydrate minus fiber.
Sources: Atkinson FS, Brand-Miller JC, Foster-Powell K, Buyken AE, Goletzke J. International tables of glycemic index and glycemic load values 2021: a systematic review. Am J Clin Nutr. 2021;114(5):1625–1632. USDA FoodData Central. How we calculate each value: Methodology & sources.
Data last reviewed 2026-09-29.