How Many Calories in Popcorn?
FoodIdentifier.comOne cup of air-popped popcorn (8g) has about 31 calories. Per USDA FoodData Central, air-popped popcorn provides 387 kcal per 100g, 78g carbs, 14.5g protein, and 3.6g fiber. The preparation method changes everything: oil-popped is ~55 per cup, microwave bags 400–600 total, and movie-theater tubs can top 1,000 calories. These are standard USDA reference values.
🔬 Nutrition Facts — Per 1 Cup Air-Popped Popcorn (8g)
Source: USDA FoodData Central · 2026
🥗 Key Ingredients & Nutrients at a Glance
📊 Quick Facts
- •1 cup air-popped (8g): 31 calories | 6.2g carbs | 0.7g fiber | 1g protein
- •Per 100g (USDA): 387 kcal | 78g carbs | 14.5g protein | 3.6g fiber
- •3 cups air-popped (24g): ~93 calories — a full snack serving
- •Oil-popped: ~55 calories per cup — about 75% more than air-popped
- •Microwave bag (whole): 400–600 calories — check servings per bag
- •Movie theater small (6 cups): 400–600 calories
- •Movie theater large tub: 1,000–1,200 calories (CSPI 2009 analysis)
- •Glycemic Index: 55 (low–moderate) | Glycemic Load: ~3 per cup (low)
- •Whole grain: 100% — popcorn is a whole-grain food
- •Fiber per 100g: 3.6g — more than most snack crackers
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📸 Try Free Food ScannerCalories in Popcorn — Why the Preparation Method Changes Everything
Popcorn is a whole grain and one of the lowest-calorie snacks — if you air-pop it. One cup of air-popped popcorn (8g) has just 31 calories. Per USDA FoodData Central, air-popped popcorn provides 387 kcal per 100g, 78g of carbs, 14.5g of protein, and 3.6g of fiber. But the preparation method changes everything: oil-popped is about 55 calories per cup, microwave bags can total 400–600 calories, and movie-theater tubs can top 1,000 calories. Three cups of air-popped popcorn (93 cal) has fewer calories than a single ounce of potato chips (152 cal). These are generic USDA values — brands and venues vary widely.
Why Air-Popped Popcorn Is a Top Weight-Loss Snack
Air-popped popcorn has an energy density of just 3.87 calories per gram — but because it is so light and fluffy, a full cup weighs only 8g and has just 31 calories. You can eat 3 cups (93 cal) for fewer calories than a single ounce of potato chips (152 cal) or a small cookie (160 cal). Popcorn is also a 100% whole grain with 3.6g of fiber per 100g and 14.5g of protein per 100g — both of which make it filling. A 2012 study published in Nutrition Journal ranked popcorn as one of the most satiating foods per calorie, and a 2019 analysis in Antioxidants noted that popcorn has one of the highest polyphenol (antioxidant) levels of any snack food. The catch is the preparation: oil-popped, microwave, and movie-theater popcorn can have 3–10 times the calories of air-popped because of added oil and butter.
🍿 Full Nutrition Facts — Air-Popped Popcorn (Per 100g and Per Cup 8g)
Complete nutrition facts for air-popped popcorn, based on USDA FoodData Central reference values. Popcorn is a whole grain and a good source of fiber and polyphenol antioxidants.
| Nutrient | Per 100g | Per Cup (8g) | % Daily Value (per cup) |
|---|---|---|---|
| Calories | 387 kcal | 31 kcal | — |
| Protein | 12.9 g | 1.0 g | 2% |
| Total Carbohydrate | 78 g | 6.2 g | 2% |
| • Dietary Fiber | 14.5 g | 1.2 g | 4% |
| • Total Sugars | 0.9 g | 0.1 g | — |
| Total Fat | 4.5 g | 0.4 g | 1% |
| Sodium | 8 mg | 1 mg | 0% |
| Iron | 3.2 mg | 0.3 mg | 2% |
| Magnesium | 144 mg | 12 mg | 3% |
| Phosphorus | 360 mg | 29 mg | 4% |
| Manganese | 0.8 mg | 0.1 mg | 3% |
🍿 Popcorn Calories by Preparation — Air vs Oil vs Microwave vs Movie Theater
The preparation method is the single biggest factor in popcorn's calorie count. Air-popped is the USDA baseline; everything else adds oil, butter, or sugar. Note: microwave and movie-theater values vary widely by brand and venue. The ranges below are standard USDA-based estimates — always check the nutrition label or ask the venue.
| Preparation | Per Cup | Per 100g | Per Typical Serving |
|---|---|---|---|
| Air-popped ★ | ~31 kcal | 387 kcal | 3 cups (24g): ~93 cal |
| Oil-popped (stove) | ~40–55 kcal | ~480–552 kcal | 3 cups: ~120–165 cal |
| Microwave (butter) | ~30–65 kcal | ~450–560 kcal | 1 bag (3.5 oz): ~400–550 cal |
| Microwave (light) | ~25–35 kcal | ~370–420 kcal | 1 bag: ~250–350 cal |
| Movie theater (small) | ~65–100 kcal | ~400–500 kcal | 6 cups: ~400–600 cal |
| Movie theater (large) | ~65–100 kcal | ~400–500 kcal | 16–20 cups: ~1,000–1,200 cal |
| Caramel corn | ~130 kcal | ~387 kcal | 1 cup (30g): ~130 cal |
Why the range? Microwave popcorn calorie counts depend on bag size, oil content, and added butter/sugar — a "light" bag can be 250 calories while a "movie theater butter" bag can be 600+. Movie-theater popcorn is popped in oil (often coconut) and topped with butter-flavored oil; a 2009 CSPI analysis found a large tub had 1,200 calories and 60g of saturated fat. For the lowest-calorie popcorn, air-pop it yourself — 31 calories per cup with no added fat. See also our glycemic index of popcorn page.
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📸 Scan Your Food Free🍿 Popcorn vs Potato Chips vs Pretzels — Full Comparison (Per 100g)
Per 100g, air-popped popcorn (387 cal) looks similar to potato chips (536 cal) and pretzels (383 cal). But the real story is per cup: popcorn is so light that a cup is 31 calories, while a cup of potato chips is about 152 calories and a cup of pretzels is about 110 calories. For the same volume of snack, air-popped popcorn has 3–5 times fewer calories. Popcorn also has more fiber (14.5g per 100g) than potato chips (4.8g) or pretzels (3.2g). For weight loss, air-popped popcorn wins on calories, fiber, and satiety per volume.
| Snack (per 100g) | Calories | Fat | Fiber | Protein |
|---|---|---|---|---|
| 🍿 Air-popped popcorn ★ | 387 kcal | 4.5 g | 14.5 g | 12.9 g |
| 🥔 Potato chips | 536 kcal | 34.6 g | 4.8 g | 7.0 g |
| 🥨 Pretzels | 383 kcal | 3.1 g | 3.2 g | 10.3 g |
Practical Tips for Eating Popcorn
- Air-pop it yourself: An air popper or a brown paper bag in the microwave (no oil) gives you 31 calories per cup. Three cups is 93 calories — a full snack for under 100 cal. Add your own salt or seasonings.
- Season without butter: Instead of butter (102 cal per tablespoon), try nutritional yeast (4 cal per tablespoon, 8g protein), smoked paprika, garlic powder, chili powder, or a light spray of olive oil. You get big flavor for almost no calories.
- Read microwave labels carefully: A "serving" on a microwave bag is often 1 cup, but a bag has 5–7 servings. Multiply calories per serving by servings per bag to get the real total. A "light" bag is 250–350 cal; a "movie theater butter" bag is 500–600 cal.
- Portion movie-theater popcorn: A small is 400–600 calories; a large tub is 1,000–1,200. Share a small, skip the buttery topping (100–130 cal per pump), or bring your own air-popped popcorn in a bag.
- Eat 3 cups as a snack: Three cups of air-popped popcorn (93 cal, 3.6g fiber, 3g protein) is one of the most filling snacks under 100 calories. It counts as roughly one whole-grain serving.
Popcorn and Weight Loss — Next Steps
Air-popped popcorn is one of the best weight-loss snacks — low in calories, high in fiber and whole grains, and one of the most satiating foods per calorie. Here's how to use it effectively:
- Use it as a high-volume, low-calorie snack: 3 cups of air-popped popcorn (93 cal) is the same calories as a single ounce of potato chips (152 cal) — but 3 times the volume and 3 times the fiber (3.6g vs 1.4g). For hunger between meals, air-popped popcorn is hard to beat.
- Replace chips and pretzels: A cup of air-popped popcorn (31 cal) has 5 times fewer calories than a cup of potato chips (152 cal) and 3.5 times fewer than a cup of pretzels (110 cal) — with more fiber per 100g than either.
- Skip the microwave and movie theater: A microwave bag (400–600 cal) and a movie-theater small (400–600 cal) have 4–6 times the calories of 3 cups of air-popped (93 cal). The difference is added oil and butter. Air-pop it yourself.
- Don't add butter or caramel: 1 tablespoon of butter adds 102 calories — tripling a 3-cup serving (93 → 195). Caramel corn has about 387 kcal per 100g with added sugar. Season with herbs, spices, or nutritional yeast instead.
For your daily calorie and protein targets, use the Calorie Calculator and Protein Calculator. This is not medical advice — talk to your doctor.
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Try Free Food Scanner →📋 Nutrition data based on USDA FoodData Central. Values may vary by brand, preparation method, and serving size. Not a substitute for professional medical or dietary advice. Always consult a registered dietitian for personalized nutrition guidance.