A cup of green grapes (about 92 grams) contains roughly 62 calories, making them one of the lower-calorie fruits you can snack on. A single grape weighs around 5 grams and has about 3 calories, so even a generous handful won’t set you back much.
Calories and Nutrition Per Serving
The exact calorie count depends on how you measure. A loosely filled one-cup serving (92 g) comes to about 62 calories, while a more tightly packed cup closer to 150 grams lands around 110 calories. That’s a big enough gap to matter if you’re tracking, so weighing your portion gives you the most accurate number. Per 100 grams, green grapes contain approximately 67 calories.
Almost all of those calories come from carbohydrates. A 92-gram cup has about 16 grams of carbs, with 15 grams of that being natural sugar (mostly glucose and fructose) and 1 gram of fiber. There’s virtually no fat or protein. Green grapes are also about 81% water by weight, which is part of why they feel refreshing and why the calorie density stays low.
Green Grapes vs. Red Grapes
Nutritionally, green and red grapes are nearly identical. The USDA groups them together in the same database entry because the calorie, sugar, and fiber numbers don’t meaningfully differ between colors. If you prefer green Thompson Seedless over red Flame or Crimson varieties, you’re not gaining or losing any caloric advantage either way.
The real difference between the two is in their antioxidant profiles. Red and purple grapes get their color from anthocyanins, a class of plant pigments with well-studied anti-inflammatory properties. Green grapes lack anthocyanins but contain their own mix of protective compounds, including luteolin, kaempferol, quercetin, and isorhamnetin. So neither color is “better.” They just offer slightly different plant nutrients for roughly the same calorie cost.
How Green Grapes Fit Into Your Diet
Because grapes are high in natural sugar and low in fiber, they digest quickly. That makes them a solid pre-workout snack or a quick energy source, but less ideal if you’re trying to stay full for hours. Pairing a cup of grapes with a small handful of nuts or a piece of cheese adds fat and protein, slowing digestion and keeping you satisfied longer.
For context, a cup of green grapes has fewer calories than a medium banana (about 105) and roughly the same as a cup of blueberries (about 85). Compared to dried fruit, the difference is dramatic: a cup of raisins packs over 400 calories because the water has been removed, concentrating the sugar. Choosing fresh grapes over dried is one of the simplest calorie swaps in a snack routine.
If you’re watching carbohydrate intake specifically, those 15 to 25 grams of sugar per cup (depending on portion size) are worth noting. Grapes rank moderate on the glycemic index, typically around 53 to 59, meaning they raise blood sugar at a moderate pace rather than spiking it sharply.
Antioxidants in Green Grapes
Green grapes contain a range of flavonoids that act as antioxidants in the body. Per 100 grams, USDA data shows about 6.6 mg of luteolin, 4.3 mg of kaempferol, 1.8 mg of isorhamnetin, and 1.6 mg of quercetin. These compounds help neutralize free radicals and reduce oxidative stress at the cellular level.
Research on grape polyphenols broadly (including those from green varieties) has identified several ways they support cardiovascular health. They help prevent the oxidation of LDL cholesterol, a key early step in artery plaque formation. They also improve the flexibility of blood vessel walls, support healthy blood pressure, and reduce the tendency of blood platelets to clump together. These effects have been observed in experimental studies and are part of why grapes, grape juice, and wine have long been associated with heart health in population research.
Portion Sizes at a Glance
- 1 grape (about 5 g): 3 calories
- 10 grapes (about 50 g): 34 calories
- 1 cup, loosely filled (92 g): 62 calories
- 1 cup, packed (about 150 g): 110 calories
- 1 pound (454 g): roughly 306 calories
Grapes are easy to overeat because they’re small, sweet, and require no preparation. If portion control matters to you, pulling a serving into a bowl rather than eating straight from the bag gives you a visual check on how much you’re consuming.