How many calories are in a banana? By size
Quick answer: a medium banana (about 7 to 8 inches long) has roughly 105 calories. Per 100 grams of peeled banana, the USDA lists about 89 calories.
Banana calories by size
The USDA gives standard weights for peeled bananas of different lengths. Multiply the weight by 0.89 calories per gram and you get the numbers below.
| Size | Length | Weight (peeled) | Calories |
|---|---|---|---|
| Extra small | under 6 in | 81 g | 72 |
| Small | 6 to 6.9 in | 101 g | 90 |
| Medium | 7 to 7.9 in | 118 g | 105 |
| Large | 8 to 8.9 in | 136 g | 121 |
| Extra large | 9 in or longer | 152 g | 135 |
The weights are for the edible part only. A banana weighed with its peel is heavier, so weigh the fruit after peeling if you want an accurate figure.
What else is in a medium banana?
Using the USDA values per 100 g, a medium banana (118 g) gives about:
- Carbohydrates: 27 g, of which around 14 g are natural sugars
- Fiber: about 3 g
- Protein: about 1.3 g
- Fat: under 0.5 g
- Potassium: about 420 mg
Almost all of a banana’s calories come from carbohydrate, which is why it is a popular pre-workout snack.
Do ripe bananas have more calories?
Not meaningfully. As a banana ripens, starch turns into sugar, so it tastes sweeter, but the total calorie count stays close to the same. Ripeness changes how the carbohydrate is made up, not how much energy the fruit holds.
How to count a banana in a recipe
If a recipe says “1 cup mashed banana”, that is about 225 g, or roughly 200 calories. For anything else, weigh the peeled banana and multiply by 0.89. You can convert grams to ounces with our grams to ounces converter.
Frequently asked questions
Is a banana a lot of sugar? A medium banana has around 14 g of sugar. That is natural sugar that comes packaged with fiber and potassium. If you are managing blood sugar for a medical reason, ask your clinician how fruit fits your plan.
How many calories are in half a banana? About 50 calories for half of a medium banana.
See the full breakdown on our banana nutrition facts page, or read how calories are calculated.