A medium apple contains about 25 grams of total carbohydrates. That includes 19 grams of naturally occurring sugar and 3 grams of fiber, leaving roughly 22 grams of net carbs (total carbs minus fiber). At around 95 calories, apples are one of the more carb-dense fruits, but they come with a fiber and nutrient profile that changes how your body actually processes those carbs.
Carbs by Apple Size
The “medium apple” used in most nutrition references weighs about 182 to 200 grams, roughly 3 inches in diameter. That’s the apple you’d grab from a grocery store bin without thinking twice. But apples vary a lot in size, and the carb count scales accordingly.
A small apple (about 150 grams) has closer to 20 grams of total carbs, while a large apple (around 240 grams) can push past 30 grams. If you’re tracking carbs precisely, weighing your apple matters more than guessing the size category. Per 100 grams of raw apple with skin, you’re looking at about 11 to 14 grams of carbohydrates depending on variety.
How Sugar Varies by Variety
Not all apples are created equal when it comes to sugar. Sweeter varieties carry noticeably more fructose and glucose than tart ones. Per 100 grams of fruit, here’s how popular varieties compare:
- Granny Smith: about 2.3 g fructose and 1.1 g glucose, making it one of the lowest-sugar options
- Braeburn: about 3.6 g fructose and 2.9 g glucose
- Golden Delicious: about 5.2 g fructose and 2.0 g glucose
- Royal Gala: about 6.9 g fructose and 2.3 g glucose
- Fuji: about 7.7 g fructose and 3.3 g glucose
That means a Fuji apple can contain more than three times the fructose of a Granny Smith of the same weight. If you’re choosing apples specifically for lower sugar content, tart green varieties are your best bet. The difference across a whole medium apple can easily be 5 to 8 grams of sugar.
Fiber Breakdown: Soluble vs. Insoluble
The 3 grams of fiber in a medium apple split into two types. Per 100 grams of Red Delicious with skin, USDA research measured about 0.67 grams of soluble fiber and 1.54 grams of insoluble fiber.
Soluble fiber dissolves in water and forms a gel-like substance in your gut. This is the type that helps slow sugar absorption and can contribute to steadier blood sugar after eating. Insoluble fiber adds bulk and keeps things moving through your digestive system. Both types are concentrated in the skin, which is one reason eating the peel matters. A peeled apple loses a meaningful share of its fiber content. One comparison found a medium apple with peel provides 4.2 grams of fiber, while a cup of apple juice retains only 0.5 grams.
How Apples Affect Blood Sugar
Despite containing 19 grams of sugar, apples have a glycemic index of 39, which falls in the low category (anything under 55 is considered low). The glycemic load, which accounts for actual portion size, is just 6 per medium apple. That’s remarkably low for a fruit with this much natural sugar.
The fiber, water content, and plant compounds in whole apples slow down digestion enough that the sugar enters your bloodstream gradually rather than in a spike. This is a completely different metabolic experience from drinking apple juice, where the fiber has been stripped out and the sugars hit your system much faster.
Apples on Low-Carb and Keto Diets
With about 22 net carbs, a single medium apple takes up a large chunk of a typical keto daily carb budget, which usually sits between 20 and 50 grams. At 11.4 grams of net carbs per 100 grams, apples are listed among higher-carb fruits in most ketogenic diet guides.
If you’re on a strict keto diet, a whole apple could use up your entire day’s carb allowance. A half apple or a small apple is more workable if you’re on a moderate low-carb plan of 50 to 100 grams per day. For standard diets without carb restrictions, the carbs in an apple are a non-issue, and the fiber, vitamins, and slow sugar release make it one of the better snack choices available.
Whole Apple vs. Apple Juice
Processing dramatically changes the carb picture. A cup of unsweetened apple juice contains roughly the same amount of sugar as a whole medium apple but delivers almost none of the fiber: 0.5 grams versus 4.2 grams. Without that fiber to slow absorption, the fructose and glucose in juice behave more like added sugar in your body, producing a faster blood sugar response. The calories from juice also tend to be less satiating, so you’re more likely to eat again sooner. If carb quality matters to you, eating the whole fruit with the skin on is the clear winner over any processed form.