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Calories per Serving Calculator

Already know a recipe's total calories, or want to build it from the ingredients? Split it into servings, slices or cookies, or weigh the finished dish and get the calories in the exact portion on your plate. Add a calorie budget to get the portion that fits it.

1. The whole recipe

Add the ingredients, or type the recipe total if you already know it. A typed total replaces the ingredient sum.

Paste an ingredient list instead

One ingredient per line, for example "2 cups flour", "1 tbsp olive oil" or "2 eggs"

Or: total calories of the whole recipe (kcal)

2. How you split it

Servings, slices or pieces

Optional: finished weight of the whole dish (g)

Optional: weight of my portion (g)

Optional: my calorie budget for this meal (kcal)

Quick answer: one batch of chocolate chip cookies, split four ways

The same dough gives very different numbers per cookie depending on how big you scoop them. Whole batch: 5,672 kcal from the USDA values (ingredients in the worked example below).

Batch cut into	kcal each	Protein g	Carbs g	Fat g
24 cookies	236	2.3	30.9	12.6
36 cookies	158	1.6	20.6	8.4
48 cookies	118	1.2	15.4	6.3
60 cookies	95	0.9	12.4	5.0

How to split a recipe's calories

A recipe has one total. What changes is how you cut it. There are three ways, and the calculator does all three:

By count. Calories per serving = total ÷ number of servings. Good for cookies, muffins and anything you portion with a scoop or a tin.
By weight. Weigh the finished dish. Calories per gram = total ÷ finished weight. Your portion = its weight × calories per gram. This is the reliable way for casseroles, soups, cakes cut by eye and anything else where pieces differ.
By budget. If you want a set number of calories, portion weight = budget ÷ calories per gram. Weigh that much onto the plate.

Formulas

kcal per serving = recipe kcal ÷ servings kcal per gram = recipe kcal ÷ finished weight (g) kcal in my portion = portion weight (g) × kcal per gram portion for budget = budget kcal ÷ kcal per gram

Worked example 1: cookies by the piece

Ingredient	Grams	kcal
2 1/4 cups all-purpose flour	281.3	1,024
1 cup butter	227.0	1,634
3/4 cup sugar	150.0	602
3/4 cup brown sugar	165.0	627
2 large eggs	100.0	144
1 tsp vanilla	4.3	12
1 tsp baking soda	4.5	0
1 tsp salt	2.0	0
2 cups chocolate chips	340.0	1,629
Whole batch	1,274	5,672

Scooped into 36 cookies, each has 5,672 ÷ 36 = 158 kcal. Scooped into 24 larger cookies, each has 236 kcal. Baking drives off water but no calories, so the batch total stays the same even though the baked cookies weigh less than the raw dough. This recipe is loaded in the calculator above.

Worked example 2: a pasta bake by weight

A pasta bake made with 6 cups cooked pasta, 450 g browned ground beef, 4 medium tomatoes, 1 medium onion, 2 cups shredded mozzarella, 2 tbsp olive oil adds up to 3,297 kcal from the USDA values. Suppose the baked dish weighs 2,000 g on your scale (weigh the empty dish first and subtract it). Then each gram has 3,297 ÷ 2,000 = 1.65 kcal, and 100 g has 165 kcal.

A 350 g portion holds 350 × 1.65 = 577 kcal. For a 500 kcal budget, weigh out 500 ÷ 1.65 = 303 g. Cutting the dish into 6 “equal” squares by eye would give 549 kcal each on paper, but the corner and middle pieces never weigh the same.

Why weight beats counting

Hand-cut slices and scooped portions vary. If one slice of a cake cut into 12 is 20% bigger than average, it carries 20% more calories than the per-serving number says. A kitchen scale removes that error. The finished weight also captures what happened in the oven: a reduced sauce or a well-baked loaf weighs less but has the same calories, so each gram carries more.

Getting the total right

The split can only be as good as the total. Count every fat and topping, use the cooked or raw value that matches the weight you entered, and weigh flour rather than scooping it. The step-by-step guide how to calculate calories in a recipe explains each step. For the full nutrition panel per serving, use the recipe nutrition calculator.

Frequently asked questions

How do I calculate calories per serving?

Divide the recipe's total calories by the number of servings. If the servings are not equal, weigh the finished dish, divide the total by its weight to get calories per gram, and multiply by the weight of your portion.

How many calories are in one slice?

Divide the whole cake, loaf or pie by the number of slices you cut. For uneven slices, weigh the whole item and your slice and use the weight method.

Why does my cooked dish weigh less than the ingredients?

Water evaporates during cooking and baking. The calories stay, so calories per gram go up. Always divide by the finished weight, not the raw weight.

What portion fits a 400 or 500 calorie meal?

Enter the budget in the calculator with the finished weight. It divides the budget by the calories per gram and tells you how many grams to put on the plate.

Can I use a total from another app or a label?

Yes. Type it in the total calories field. The calculator then ignores the ingredient rows and only splits the number you typed. Macros are shown only when the ingredients are used.

Sources

USDA FoodData Central: nutrient values per 100 g and household cup and spoon weights. Each ingredient row links to its record in the ingredient reference table.
USDA FoodData Central (SR Legacy) portion weights for whole items: large egg 50 g, large egg white 33 g, medium banana 118 g, medium apple 182 g, garlic clove 3 g, medium onion 110 g, medium carrot 61 g, medium tomato 123 g, medium bell pepper 119 g.
USDA Agricultural Research Service, cooking yields: how much weight foods lose or gain when they are cooked.
FAO, Food energy: methods of analysis and conversion factors (2003), chapter 3: the Atwater general factors of 4 kcal per gram of protein and carbohydrate and 9 kcal per gram of fat.

Estimates for home cooking, not medical or dietary advice. Brands, cuts and cooking methods change the real values.