how many carbs are in a banana

June 27, 2026

A medium banana has about 25–27 grams of carbs , depending on size and ripeness.

How Many Carbs Are in a Banana?

Quick Scoop

For a typical fresh banana:

Small banana (~6 inches): about 20–23 g carbs.

Medium banana (~7–8 inches): about 25–27 g carbs (around 24 g net carbs after fiber).

Large banana (9 inches or more): about 30–35 g carbs.

Most nutrition references and diabetes forums use “about 25–30 g” as the rule of thumb for an average banana.

Mini Breakdown: Why Numbers Differ

Carbs come mainly from natural sugars, starch, and fiber in the banana.

As a banana ripens, more starch turns into sugar, so it tastes sweeter but the total carbs stay in roughly the same range ; the balance of sugar vs. starch changes.

On labels and trackers, a 118 g medium banana is usually listed at about 27 g total carbs, 3 g fiber, and ~24 g net carbs.

If you count net carbs , subtract the fiber:
net carbs = total carbs − fiber.

Quick HTML Table (by Size)

html

<table>
  <thead>
    <tr>
      <th>Banana size</th>
      <th>Approx. weight</th>
      <th>Total carbs (g)</th>
      <th>Net carbs (g)</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td>Small (≈ 6 in)</td>
      <td>≈ 100 g</td>
      <td>20–23</td>
      <td>17–20</td>
    </tr>
    <tr>
      <td>Medium (7–8 in)</td>
      <td>≈ 118 g</td>
      <td>25–27</td>
      <td>22–24</td>
    </tr>
    <tr>
      <td>Large (≥ 9 in)</td>
      <td>≈ 135–150 g</td>
      <td>30–35</td>
      <td>26–31</td>
    </tr>
  </tbody>
</table>

Values are rounded from typical nutrition databases and health resources.

Forum & “Real Life” Talk

In diabetes and low‑carb forums, people usually:

Count 20–22 g for a small banana,
25–30 g for a regular one,
And agree that 30 g+ is realistic for a big, very ripe banana.

Some also point out that bananas can spike blood sugar quickly because of their glycemic index , even if the carb number doesn’t seem huge.

Quick TL;DR

Typical answer: a banana has about 25–27 g of carbs.
If it’s small , think ~20 g; if it’s big and ripe , think 30+ g.

Information gathered from public forums or data available on the internet and portrayed here.