Lentils are one of the most affordable sources of plant protein and fiber, but their calorie numbers can be confusing because raw and cooked lentils are very different. One cup of dry lentils weighs about 192 g and contains over 650 calories, while one cup of boiled lentils weighs about 198 g and contains only around 230 calories. This Lentil Calories Per Serving Calculator clears up the confusion in seconds.
Choose whether your lentils are raw/dry or cooked, enter the amount and the number of servings, and the calculator will estimate total calories, calories per serving, and the protein, carbohydrate, fiber, and fat content for each portion. It works for meal prep, recipe scaling, and everyday calorie tracking.
The estimates are based on standard USDA nutrition data for mature seed lentils, so you can trust the numbers for green, brown, and red varieties.
Enter your lentil amount, choose dry or cooked, and this tool will estimate calories and macros per serving.
How to Use This Tool
First decide how you are measuring your lentils. Raw or dry lentils have almost no water, so they are calorie-dense: roughly 352 kcal per 100 g. Cooked lentils absorb water during boiling, so the same 100 g portion weighs more physically but supplies fewer calories — about 116 kcal per 100 g.
Choose Raw / dry or Cooked from the dropdown, enter the total amount you plan to prepare or eat, and select the unit that matches your recipe: cups, grams, or ounces. Then enter the number of servings you want to split the batch into. Press Calculate to see total calories, calories per serving, weight per serving, and the main macronutrients for each portion.
- Use the preset pills for common measurements like “1 cup dry” or “100 g cooked”.
- For meal prep, enter the whole batch size and the number of containers you are filling.
- For a single bowl, set servings to 1.
How the Calculation Works
The calculator uses USDA nutrient values for mature seed lentils. The core formula is simple:
Calories = weight in grams × (calories per 100 g ÷ 100)
For raw lentils, the per-100 g values are about 352 kcal, 24.6 g protein, 63.4 g carbohydrate, 10.7 g fiber, and 1.1 g fat. For boiled lentils, the values are about 116 kcal, 9.0 g protein, 20.1 g carbohydrate, 7.9 g fiber, and 0.4 g fat.
To convert volume to weight, the tool applies these approximations:
- 1 dry cup of lentils ≈ 192 g
- 1 cooked cup of lentils ≈ 198 g
- 1 ounce = 28.35 g
Once the amount is converted to grams, the calculator multiplies by the appropriate calorie factor and divides by the number of servings. Macros are calculated the same way. These values are consistent with the USDA FoodData Central reference database.
Worked Examples
Example 1: Dry lentil batch. You measure 2 dry cups of lentils and want 4 servings. Weight: 2 × 192 = 384 g. Total calories: 384 × 3.52 = 1351 kcal. Per serving: 1351 ÷ 4 = 338 kcal. Each serving also has roughly 23.6 g protein, 60.9 g carbs, and 10.3 g fiber.
Example 2: Cooked lentils from a pot. You have 1.5 cooked cups and plan 3 servings. Weight: 1.5 × 198 = 297 g. Total calories: 297 × 1.16 = 345 kcal. Per serving: 345 ÷ 3 = 115 kcal, with about 8.9 g protein and 6.1 g fiber per serving.
Example 3: Gram-based single serving. You eat 150 g of cooked lentils. Calories: 150 × 1.16 = 174 kcal. Protein: 150 × 0.09 = 13.5 g. Fiber: 150 × 0.079 = 11.9 g.
Reference Table: Dry vs Cooked Lentils
The table below summarizes typical nutrient values per 100 g. Notice how much of the difference comes from water content.
| Nutrient (per 100 g) | Raw / Dry | Cooked |
|---|---|---|
| Calories | 352 kcal | 116 kcal |
| Protein | 24.6 g | 9.0 g |
| Carbohydrate | 63.4 g | 20.1 g |
| Fiber | 10.7 g | 7.9 g |
| Fat | 1.1 g | 0.4 g |
| Water | 8.3 g | 69.9 g |
Common Mistakes to Avoid
- Mixing dry and cooked measurements. If a recipe says “1 cup lentils” it usually means dry, while leftovers are measured cooked. The calorie difference is huge.
- Forgetting that lentils absorb water. One dry cup becomes roughly 2 to 2.5 cooked cups. The total calories in the batch stay the same, but the volume and weight change.
- Ignoring added fat. A spoonful of olive oil, butter, or bacon fat can add 50–120 kcal per serving. This calculator assumes plain lentils with no added oil.
- Using a kitchen scale is always more accurate than cups, especially for dry lentils. Compacted cups can vary by 10% or more.
Frequently Asked Questions
Why do cooked lentils have fewer calories per 100 g than raw lentils? Because cooking adds water. The calories from the lentils themselves do not disappear; they are just spread across a heavier, waterlogged product. One dry cup and the cooked lentils made from it contain roughly the same total calories.
Are red, green, and brown lentils nutritionally different? Slightly, but not by much. Most common lentil varieties have similar calorie, protein, and fiber profiles. This calculator uses representative averages that work well for meal planning.
How much protein is in a serving of lentils? A 100 g serving of cooked lentils provides about 9 g of protein, while a 100 g serving of dry lentils provides about 24.6 g. For a protein-focused breakdown, see the lentil protein per 100 g calculator.
Can I use ounces? Yes, the calculator converts ounces to grams automatically. If you prefer an ounce-focused tool, try the lentil calories per ounce calculator.
How do these numbers compare with my daily targets? Use the totals alongside your personal calorie and macro goals. The nutrition target calculator can help you set daily calories, protein, carbs, and fat ranges.