A medium apple (182g) contains about 95 calories, with nearly all of those calories coming from natural sugars and carbohydrates. That makes apples one of the lowest-calorie whole fruits you can grab, and their high fiber content means those calories keep you fuller than you’d expect.
Calories by Apple Size
Apple calories scale predictably with size. A medium apple, roughly the size of a tennis ball, sits at 95 calories. Small apples (closer to 150g) land around 77 to 80 calories, while a large apple (about 240g) runs approximately 125 to 130 calories. These numbers apply to raw apples with the skin on, regardless of variety. A Fuji, Gala, Granny Smith, or Honeycrisp of the same weight will all be within a few calories of each other.
For quick mental math, apples contain roughly 52 calories per 100 grams. So if you weigh your fruit on a kitchen scale, just multiply the weight in grams by 0.52.
What Those Calories Are Made Of
Almost every calorie in an apple comes from sugar, but the type of sugar matters. A 200g apple contains roughly 20 to 25 grams of sugar total, broken down into three types: fructose makes up the largest share at about 6.5g per 100g of apple, followed by sucrose at roughly 4.75g per 100g, and glucose at around 1.5g per 100g. The fructose-to-glucose ratio sits close to 2:1.
Apples contain virtually no fat and only trace amounts of protein. A medium apple provides about 15 grams of available carbohydrates (the kind your body actually digests for energy) plus around 4.4 grams of fiber, which passes through without contributing significant calories.
Why Apples Don’t Spike Blood Sugar
Despite being almost pure sugar by calorie count, apples have a low glycemic index of 39 (out of 100) and a glycemic load of just 6 per medium fruit. Anything under 10 is considered low. This means eating an apple produces a slow, gentle rise in blood sugar rather than a sharp spike and crash.
The fiber in apples, particularly a soluble type called pectin, is responsible for this effect. Pectin forms a gel-like substance in your digestive tract that physically slows down how fast sugar gets absorbed. Research on pectin has shown it nearly doubles the time food takes to leave your stomach, increasing gastric emptying time from about 71 minutes to 116 minutes. That slower digestion keeps sugar from flooding your bloodstream all at once.
Apples and Fullness
At under 100 calories, a medium apple is surprisingly filling. The same pectin that slows sugar absorption also increases feelings of satiety. In studies on obese subjects, pectin significantly boosted self-reported fullness compared to other types of fiber. The mechanism is straightforward: soluble fiber slows the rate at which food moves through your gut, giving your body more time to register that you’ve eaten and to send the hormonal signals that tell your brain you’re satisfied.
This is one reason whole apples are a better choice than apple juice. A cup of apple juice contains about 114 calories with no fiber to slow absorption or trigger fullness. You’d drink it in 30 seconds and feel hungry again shortly after. A whole apple takes several minutes to chew and delivers enough fiber to keep you satisfied for much longer.
Does Peeling Change the Calories?
Peeling an apple doesn’t dramatically change its calorie count, since the skin is extremely thin and light. What you do lose is a significant portion of the nutrients and fiber. Up to one-third of an apple’s total fiber sits in and just beneath the skin. A peeled apple also contains dramatically less vitamin K (up to 332% less), vitamin A (142% less), and vitamin C (115% less) compared to one eaten with the skin on.
If you’re eating apples partly for the fiber and fullness benefits described above, keeping the skin on is worth it. The slight texture difference delivers a meaningful nutritional upgrade for essentially the same calorie cost.
Comparing Apples to Other Snacks
- Medium banana: about 105 calories, slightly more than an apple with less fiber
- Cup of grapes: about 104 calories, similar to an apple but easier to overeat
- Granola bar: typically 150 to 250 calories with added sugars
- Small bag of chips (1 oz): about 152 calories with almost no fiber
Calorie for calorie, apples deliver more volume, more chewing time, and more fiber than most portable snacks. That combination of low energy density and high satiety is why they consistently show up in weight management research as a useful between-meal option.