Ever wonder how many calories are in a single slice of potato? This calculator converts a whole potato's weight into precise per-slice calories, so you can portion snacks, side dishes, and sheet-pan dinners without guesswork. Just enter the potato weight (or pick a size preset), set how many slices you plan to cut, choose the cooking method, and the tool does the rest.
Whether you're tracking calories for weight management, building a balanced meal, or simply curious about the difference between boiled, baked, and roasted potatoes, this tool gives you a clear answer in seconds. It also breaks down carbs, protein, and fat per slice, making it a handy companion for macronutrient tracking and healthy eating plans.
Potato nutrition varies with variety, cooking method, and whether the skin is kept on, so the results are useful estimates based on USDA reference data rather than lab-grade precision.
🥔 Potato Calories Per Slice Calculator
Step-by-Step Guide
This calculator is built around the simple idea that total potato calories can be divided by the number of slices you cut. Follow these steps:
- Weigh your potato. Use a kitchen scale for the most accurate result. If you don't have one, choose Small (about 120 g), Medium (210 g), or Large (330 g) using the preset buttons.
- Enter how many slices you plan to cut. For even portions, aim for similar thickness — about 1 cm (3/8 inch) is a typical medium slice.
- Select the cooking method. Boiled and baked potatoes stay close to 77–93 kcal per 100 g, while roasted potatoes are higher because oil and fats are usually added.
- Enter how many slices you'll actually eat. This is your portion, and it may be different from the total slices in the potato.
- Press Calculate. The result area shows per-slice calories, the full potato total, your portion total, and a macronutrient breakdown.
You can use the result immediately for a food diary or an app like MyFitnessPal or Cronometer.
Calorie & Macro Reference
The following values are averages from USDA FoodData Central for common potato preparations without added toppings. They are the basis of the calculator's estimates.
| Method | Calories / 100 g | Carbs | Protein | Fat |
|---|---|---|---|---|
| Raw | 77 kcal | 17.5 g | 2.0 g | 0.1 g |
| Boiled | 87 kcal | 20.1 g | 1.7 g | 0.1 g |
| Baked (with skin) | 93 kcal | 21.1 g | 2.5 g | 0.1 g |
| Roasted | 142 kcal | 21.4 g | 2.6 g | 5.0 g |
Remember that adding butter, oil, cheese, sour cream, or salt changes the calorie and micronutrient profile. The default serving in this tool is plain potato, either with or without skin depending on the method. Source: USDA FoodData Central.
Worked Example
Example: A 240 g baked potato cut into 8 slices.
Step 1: 240 ÷ 8 = 30 g per slice.
Step 2: 30 × 93 ÷ 100 = 27.9 kcal per slice.
If you eat 3 slices: 27.9 × 3 = 83.7 kcal.
Try another example: a 180 g boiled potato cut into 6 slices gives 30 g per slice and 30 × 87 ÷ 100 = 26.1 kcal per slice. If you eat all 6 slices, that's 156.6 kcal — an excellent low-calorie side dish for a meal.
Tips for More Consistent Tracking
- Weigh before cooking. Potatoes lose water when baked or roasted, so a cooked 200 g potato isn't the same as a raw 200 g potato. For matching the values above, choose the method that matches your cooked state.
- Keep slice thickness even. Thin slices will naturally be lower in calories per slice; thick wedges will be higher. If you cut irregular pieces, weighing each slice is more exact.
- Account for added fats. Roasted potatoes cooked in 1–2 tablespoons of oil gain roughly 120–240 kcal for the whole batch, so distribute that across your portion.
- Use the “slices per potato” field honestly. If you cut a 300 g potato into 6 thick wedges, each wedge weighs 50 g; if you cut it into 12 thin chips, each is 25 g.
- For meal prep, multiply per-slice calories by batch quantities and divide by number of servings to scale recipes.
Frequently Asked Questions
Is a medium potato really 210 g?
A medium baking potato typically weighs 170–250 g, depending on variety and moisture content. The 210 g preset is a reasonable middle estimate. Weighing your actual potato is always better.
Why are roasted potatoes higher in calories than boiled potatoes?
Roasted potatoes usually contain added fat (oil or butter) and lose water during cooking, which concentrates calories. The 142 kcal per 100 g figure assumes some oil; plain oven-baked chunks without oil would be closer to baked potato values.
Should I track raw or cooked weight?
It depends on the nutrition data you're using. This calculator uses per-100 g values for the selected cooked state (except raw). If you weigh raw, choose “Raw”; if you weigh after cooking, choose the corresponding method. Consistency matters more than precision.
Does this work for sweet potatoes?
Not exactly. Sweet potatoes have a different nutrient profile (about 86 kcal per 100 g when baked, with more sugar and vitamin A). This calculator is designed for white, russet, Yukon Gold, and similar potato varieties.