Lentils are one of the most satisfying, budget-friendly plant proteins around, but their calorie count changes dramatically depending on whether you weigh them dry or cooked. Dry, uncooked lentils pack roughly 100 calories per ounce, while cooked lentils deliver only about 33 calories per ounce because they absorb water. That difference is easy to overlook, and it often leads to guesswork when tracking a meal.
This Lentil Calories Per Ounce Calculator takes the guesswork out of portion tracking. Select raw or cooked, enter a weight in ounces or grams, and the tool returns total calories, calories per ounce, and a full macronutrient breakdown: protein, carbohydrates, fiber, and fat. An optional serving multiplier makes batch cooking and meal prep faster.
Nutrition reference values come from the USDA FoodData Central database for common green and brown lentils, so the results are realistic estimates you can use for calorie tracking, vegetarian meal planning, and recipe nutrition labels.
🧮 Lentil Calorie Calculator
Estimate calories and macros for raw or cooked lentils, in ounces or grams.
Step-by-Step Guide
Use the calculator as a daily food log helper or as a meal prep planner.
- Choose the lentil state. Select Raw / Dry when using uncooked lentils straight from the bag or package. Select Cooked / Boiled when using lentils that have been simmered in water with no added oil or butter.
- Enter the weight. Type an amount in ounces or grams, or tap a preset. The unit dropdown switches between ounces and grams without changing the portion logic.
- Set servings, if needed. Enter 2 to see the total for double the batch, 4 for quadruple, and so on.
- Calculate. The result shows the total calories, calories per ounce, and a macro breakdown for the amount you entered.
🧪 The Math Behind the Calories
The calculator uses energy and macronutrient values from the USDA FoodData Central reference database for raw lentils and boiled lentils without salt. The core idea is simple: USDA nutrition data is expressed per 100 grams, so the tool converts the weight you enter into grams and scales those numbers.
For raw lentils, 100 g contains about 352 kcal, 24.6 g protein, 63.4 g carbohydrates, 10.7 g fiber, and 1.1 g fat. Because 1 ounce equals 28.35 g, each ounce provides roughly 352 × 0.2835 = 99.8 kcal. For cooked lentils, 100 g contains about 116 kcal, 9.0 g protein, 20.1 g carbohydrates, 7.9 g fiber, and 0.4 g fat, so each ounce provides roughly 116 × 0.2835 = 32.9 kcal. Any weight in ounces can be converted to grams first and then scaled from the 100 g benchmark.
Raw data is available through the USDA FoodData Central portal if you want to compare specific varieties.
Worked Examples
Example 1: 3 oz raw lentils
3 oz × 28.35 = 85.05 g. Since raw lentils provide 352 kcal per 100 g, total calories are 85.05 / 100 × 352 = 299.4 kcal. Protein comes out at about 20.9 g, carbs 53.9 g, and fiber 9.1 g.
Example 2: 8 oz cooked lentils
8 oz × 28.35 = 226.8 g. Cooked lentils provide 116 kcal per 100 g, so total calories are 226.8 / 100 × 116 = 263.1 kcal. That is roughly one heaping cup of cooked lentils, with about 20.4 g protein and 17.9 g fiber.
📊 Reference Data
Typical values for common green and brown lentils, rounded to one decimal place.
| Nutrient | Raw per 100 g | Raw per oz | Cooked per 100 g | Cooked per oz |
|---|---|---|---|---|
| Calories | 352 kcal | 99.8 kcal | 116 kcal | 32.9 kcal |
| Protein | 24.6 g | 7.0 g | 9.0 g | 2.6 g |
| Carbohydrates | 63.4 g | 18.0 g | 20.1 g | 5.7 g |
| Fiber | 10.7 g | 3.0 g | 7.9 g | 2.2 g |
| Fat | 1.1 g | 0.3 g | 0.4 g | 0.1 g |
Portion Planning Tips & Common Mistakes
Tracking lentils gets tricky because the same bag can be weighed raw or cooked, and the numbers are not interchangeable. Raw lentils absorb roughly 2 to 3 times their weight in water. That means 100 g of dry lentils becomes about 250 g of cooked lentils. If you compare 100 g raw and 100 g cooked, you are effectively comparing different amounts of food.
If you regularly track other starchy sides, the rice calorie calculator uses a similar raw-versus-cooked principle and can help you compare portions. For a broader look at legumes in a healthy diet, see the Harvard T.H. Chan School of Public Health lentil feature.
- A standard 1/2 cup serving of cooked lentils weighs about 100 g and provides around 116 kcal.
- A 1/4 cup of dry lentils weighs about 50 g and provides roughly 176 kcal.
- When adding oil, broth, or cured meats, add those calories separately.
Frequently Asked Questions
Why do cooked lentils show fewer calories per ounce?
When lentils are boiled, they absorb water and gain weight without gaining meaningful calories. The same 100 g portion after cooking contains fewer dry lentil solids, so its calorie density drops from about 352 kcal per 100 g to about 116 kcal per 100 g.
Should I weigh my lentils raw or cooked?
For the most consistent tracking, weigh raw lentils before cooking. Package nutrition labels are almost always based on dry weight. If you are logging a plate of leftovers, weigh the cooked portion and choose the cooked setting.
Do red and yellow lentils have the same calories?
They are very close. This calculator uses values for common green and brown lentils, but most lentil varieties fall in the range of 340-360 kcal per 100 g dry and about 110-120 kcal per 100 g cooked.
How many ounces are in a serving of lentils?
A typical 1/2 cup cooked portion weighs about 3.5 oz and contains about 115 kcal. A full cup of cooked lentils weighs about 7 oz and provides roughly 230 kcal.
Does this calculator include oil or seasoning?
No. The values assume plain boiled lentils with no added fat or seasonings. Add oil, butter, ghee, or coconut milk separately if you use them.