Calories in Sweet potato

Data reviewed 2026-09-08 against USDA FoodData Central (SR Legacy).

A 100 g serving of sweet potato has about 90 kcal, with 2 g of protein, 20.7 g of carbohydrate (3.3 g of that fibre) and 0.2 g of fat. The table below gives the full breakdown and the most common portion sizes.

Nutrition per 100 g

NutrientPer 100 g
Calories90 kcal
Protein2 g
Carbohydrate20.7 g
Fibre3.3 g
Sugars6.5 g
Fat0.2 g
Saturated fat0.1 g
Sodium36 mg
Cholesterol0 mg

Common portions

PortionWeightCalories
cup200 g180 kcal
large180 g162 kcal
medium (2" dia, 5" long, raw)114 g103 kcal
small60 g54 kcal

Log sweet potato in a recipe

To see how sweet potato affects a whole dish, drop it into the recipe calorie calculator with the rest of your ingredients — it totals calories, protein, carbs and net carbs for the recipe, per serving and per 100 g. The methodology shows the exact arithmetic.

Frequently asked questions

How many calories are in sweet potato?

About 90 kcal per 100 g. Portion calories depend on how much you use — see the portions table above for common amounts.

How much protein is in sweet potato?

Sweet potato has roughly 2 g of protein per 100 g.

Is sweet potato keto-friendly?

Its net carbs are about 17.4 g per 100 g (total carbs 20.7 g minus 3.3 g fibre). Whether it fits your day depends on portion size and your carb target.

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