Calories in French Fries
Updated July 2026 · Source: USDA FoodData Central
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Nutrition Facts
* % Daily Value based on a 2,000 kcal diet.
Vitamins & Minerals — per 100g
| Nutrient | Amount | % Daily Value | Bar |
|---|---|---|---|
| Potassium | 579mg | 12% | |
| Vitamin B6 | 0.32mg | 19% | |
| Niacin | 2.6mg | 16% | |
| Vitamin C | 9.7mg | 11% | |
| Phosphorus | 107mg | 9% | |
| Magnesium | 27mg | 6% | |
| Iron | 0.79mg | 4% | |
| Sodium | 210mg | 9% | |
| Zinc | 0.46mg | 4% | |
| Folate | 24µg | 6% |
Calories in French Fries by Weight
| Weight | Calories | Protein | Net Carbs | Fat |
|---|
Macronutrient Breakdown — per 100g
Fried in vegetable oil. McDonald's medium (117g): 320 kcal. Large (154g): 490 kcal. Air-fryer fries (~150 kcal/100g). GI ~75 — high. Acrylamide forms at high frying temperatures — a potential carcinogen. Potassium retained from potato (579mg/100g).
Key Nutrients
French Fries Nutrition Facts
The Frying Transformation
A raw potato has ~77 kcal/100g and 0.1g fat. Deep frying transforms it to ~312 kcal/100g and 15g fat — a 4× calorie increase. The oil absorbed during frying (approximately 8-12g per 100g of fried potato) accounts for the majority of the calorie difference. This means french fries are roughly 40-45% oil by calories, not potato. Air frying achieves similar texture at ~150 kcal/100g by using circulated hot air instead of oil immersion.
Acrylamide — Cancer Concern
When starchy foods are cooked at high temperatures (>120°C), a chemical reaction between asparagine (an amino acid) and sugars creates acrylamide — a compound classified as 'probably carcinogenic' (Group 2A) by IARC. French fries have among the highest acrylamide levels of any food. The WHO advises minimising high-temperature frying of starchy foods. Blanching potatoes before frying and lower frying temperatures (160°C vs 180°C) reduce acrylamide formation.
Retained Potato Nutrients
Despite frying, some potato nutrients survive: potassium (579mg/100g — 12% DV), vitamin B6 (19% DV), and some vitamin C (11% DV). These are genuine nutritional contributions that plain potato provides. However, the added fat and lost potato fiber (skin usually removed for commercial fries) significantly reduce the overall nutritional value compared to baked skin-on potato.
Portion Size Psychology
French fries are a textbook example of portion size psychology. Restaurant portions have grown substantially — a 1970s McDonald's regular serving was 65g (200 kcal); today's large is 154g (490 kcal). The 'side' has become a 490-calorie accompaniment. Ordering small fries, sharing, or substituting salad is the most effective strategy for reducing calorie intake from this category.
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Sources
Nutrition values from USDA FoodData Central. Not medical advice.