A cup of sliced strawberries (about 168 grams) contains roughly 7 to 8 grams of sugar, making them one of the lowest-sugar fruits you can eat. For comparison, a cup of grapes has around 23 grams and a cup of mango about 22 grams. Strawberries sit closer to raspberries and blackberries on the sugar spectrum.
Sugar Content by Serving Size
Per 100 grams of raw strawberries, you’re looking at about 4.9 grams of sugar and 7.7 grams of total carbohydrates. A single medium strawberry (around 12 grams) has less than a gram of sugar. Here’s how the common portions break down:
- 1 medium strawberry (12g): about 0.6g sugar
- 1 cup whole strawberries (144g): about 7g sugar
- 1 cup sliced strawberries (168g): about 8g sugar
That cup of sliced strawberries also delivers about 3 grams of dietary fiber and only around 53 calories. The fiber content is worth noting because it slows how quickly your body absorbs the sugar, which helps prevent a sharp spike in blood glucose.
What Types of Sugar Are in Strawberries
Not all fruit sugars are identical, and the mix in strawberries is a bit unusual. Research published in the Journal of the American Society for Horticultural Science measured the breakdown in ripe strawberries at roughly 1.5% fructose, 1.2% glucose, and 0.6% sucrose by weight. That means fructose makes up the largest share, followed closely by glucose, with sucrose (ordinary table sugar) contributing the smallest portion.
This matters because fructose and glucose are simple sugars your body can absorb directly, while sucrose needs to be split into those two components first. The relatively low sucrose content is one reason strawberries taste bright and tangy rather than syrupy sweet like a banana or fig.
Why Some Strawberries Taste Sweeter
If you’ve ever eaten a bland, pale strawberry in January and a deeply red one in June, you already know sugar content varies. Several factors influence how much sugar ends up in the fruit.
Ripeness is the biggest variable. Sugars accumulate steadily as a strawberry moves from green to white to red. A fully ripe, deep-red berry has significantly more sugar than one picked early. Research in plant science has shown that sucrose plays a direct role in triggering ripening itself, accelerating the coloring process and pushing the fruit toward its sweetest state. A strawberry picked before it finishes this cycle never reaches its full sugar potential, because unlike bananas, strawberries don’t continue ripening much after harvest.
Variety matters too. Some cultivars are bred for sweetness, others for firmness and shelf life (which is why supermarket strawberries often disappoint compared to farmers’ market or homegrown ones). Growing conditions like sunlight, temperature, and soil also affect sugar accumulation. Berries that ripen during warm, sunny stretches tend to be sweeter.
Glycemic Index and Blood Sugar Effects
Strawberries have a glycemic index (GI) of about 40, which falls in the low category (anything under 55 is considered low). For context, white bread scores around 75 and watermelon about 76. A low GI means the sugar in strawberries enters your bloodstream gradually rather than all at once.
The glycemic load, which accounts for how much sugar is actually in a realistic serving, is even more reassuring. Because a cup of strawberries contains only about 8 grams of sugar total, the glycemic load per serving lands around 1 to 3, which is very low. You’d need to eat several cups in one sitting before strawberries would meaningfully move your blood sugar.
Strawberries on Diabetes and Low-Carb Diets
A cup of fresh strawberries contains approximately 15 grams of total carbohydrates, which is roughly one carb serving in most diabetes meal planning systems. If you use insulin with meals, those carbs count toward your total and your dose should reflect them, just as with any other food.
Pairing strawberries with a source of protein or fat further blunts the blood sugar response. Eating them with a handful of nuts, mixing them into Greek yogurt, or adding them to a salad with cheese are all practical ways to slow absorption.
For ketogenic diets, strawberries are one of the more compatible fruits. Subtracting the 3 grams of fiber from the 15 grams of total carbs in a cup gives you about 12 grams of net carbs. A half-cup serving, which is a reasonable snack portion, comes in around 6 grams of net carbs, making it easier to fit within a typical daily limit of 20 to 50 grams.
Fresh vs. Frozen vs. Dried
Fresh and frozen strawberries (with no added sugar) have virtually identical sugar content. Freezing doesn’t change the nutritional profile in any meaningful way, so buying frozen is a perfectly good option, especially outside of strawberry season when fresh ones are picked early and shipped long distances.
Dried strawberries are a different story. Removing the water concentrates everything, including sugar. A quarter-cup of dried strawberries can contain 25 to 30 grams of sugar, and many commercial brands add extra sugar or juice concentrate during processing. If you’re watching your intake, always check the label on dried varieties. Freeze-dried strawberries without added sugar are a better option, though they’re still more calorie-dense by volume than fresh.