A medium order of french fries from a major fast-food chain contains roughly 320 to 360 calories. That number shifts significantly depending on where you order, what size you pick, and how the fries are cooked. A small order can come in under 230 calories, while a large can push past 500.
Calories at Major Fast-Food Chains
For a standard medium or “regular” order, the calorie counts at popular chains are closer than you might expect. McDonald’s medium fries come in at 320 calories with 15 grams of fat and 43 grams of carbs. Burger King’s medium fries land at 360 calories with 16 grams of fat. In-N-Out’s regular order also hits 360 calories, though with notably less sodium at just 150 milligrams compared to Burger King’s 360 milligrams.
Per 100 grams, fast-food fries generally fall between 280 and 323 calories, with 12 to 15 grams of fat. The variation comes down to the oil used, how long the fries sit in the fryer, and whether they’re coated in any seasoning or starch before cooking.
How Serving Size Changes the Picture
Serving size is where calorie counts really diverge. Using McDonald’s as a reference point, since their portions are among the most standardized in the industry: a small order weighs about 68 grams and contains roughly 230 calories. A medium weighs 147 grams at around 320 calories. A large weighs 176 grams and lands near 400 calories. The old “super size” option, no longer widely available, weighed 198 grams and packed over 500 calories.
That means upgrading from a small to a large nearly doubles your calorie intake for what feels like a modest increase in the container size. If you’re splitting fries at the table or watching your intake, a small order is legitimately a different food decision than a large one.
Deep Fried vs. Air Fried
Cooking method is the single biggest lever for cutting calories in french fries. A serving of deep-fried fries contains around 471 calories, while the same serving made in an air fryer drops to about 176 calories. That’s a 63% reduction, driven almost entirely by the amount of oil the potatoes absorb during cooking.
Deep frying submerges the potato in oil at high heat, and the moisture escaping from the potato gets replaced by fat. Air fryers circulate hot air to crisp the surface, using little to no added oil. The texture is slightly different, with air-fried fries being drier and crunchier on the outside, but the calorie savings are substantial. Oven-baked fries fall somewhere in between, depending on how much oil you toss them with before roasting.
What the Fat and Carbs Look Like
French fries get their calories from two main sources: fat from the frying oil and carbohydrates from the potato itself. In a typical fast-food serving, fat accounts for about 40 to 45% of the total calories, with carbs making up most of the rest. Protein is minimal, usually around 3 to 4 grams per serving.
The type of fat matters too. Most major chains have moved away from trans fats, with current levels sitting at nearly zero (0.05 to 0.06 grams per 100 grams). The fat profile now leans toward polyunsaturated and monounsaturated fats from vegetable oils, though the exact breakdown varies by restaurant. Saturated fat in a medium order typically stays between 2 and 3 grams.
Sodium Can Add Up Fast
Calories tend to get the most attention, but sodium is where french fries can quietly do the most damage. A large order of fries can contain over 1,600 milligrams of sodium, which is 70% of the recommended daily limit in a single side dish. Even a medium order at most chains delivers 260 to 450 milligrams.
If you’re pairing fries with a burger or sandwich that already contains several hundred milligrams of sodium, a large fry order can push your entire meal past the full daily recommendation of 2,300 milligrams.
Don’t Forget the Dipping Sauce
The fries themselves are only part of the calorie equation. A standard two-tablespoon serving of ranch dressing adds 129 calories, nearly all from fat. Ketchup is lighter at roughly 30 to 40 calories per two tablespoons, mostly from sugar. Mayonnaise-based sauces and cheese dips typically fall in the 80 to 150 calorie range per portion.
Most people use more than one portion of sauce per order of fries, especially with a medium or large. Two servings of ranch adds 258 calories to your fries, which on its own is more than a small order of fries contains. If you’re trying to keep the total reasonable, ketchup is the lowest-calorie option by a wide margin, or you can skip the sauce entirely and rely on salt and seasoning for flavor.
Homemade Fries: Your Lowest-Calorie Option
Making fries at home gives you the most control over calories. Start with a medium russet potato (about 150 grams), which contains roughly 110 calories on its own before any cooking fat is added. Toss the cut potatoes with one tablespoon of oil (about 120 calories) and bake or air fry them, and you end up with a generous portion for around 230 to 250 calories total. That’s comparable to a fast-food small order but with significantly more food on your plate, less sodium, and no mystery ingredients.
The trick to crispy homemade fries is soaking the cut potatoes in cold water for 30 minutes before cooking. This removes surface starch, which helps them brown and crisp without needing extra oil. A light coating of cornstarch before air frying can mimic the crunch of a deep-fried version while keeping calories low.