Meal Calorie Calculator
Calories from macros in a meal.
Enter your values
Enter the protein in g.
Enter the carbohydrate in g.
Enter the fat in g.
Enter the alcohol in g.
Results update instantly as you type — no submit needed. Your values are remembered on this device, and the shareable link reopens the calculator with exactly these numbers.
- Total calories
- 542 kcal
- From protein
- 140 kcal (26%)
- From carbs
- 240 kcal (44%)
- From fat
- 162 kcal (30%)
- From alcohol
- 0 kcal
Quick answer
Protein and carbs give 4 kcal per gram, fat 9 and alcohol 7 — adding them gives total meal calories.
kcal = 4P + 4C + 9F + 7A
At a glance
| What it does | Calories from macros in a meal. |
|---|---|
| Category | Health |
| Inputs needed | Protein, Carbohydrate, Fat, Alcohol |
| Main output | Total calories |
| Formula | kcal = 4P + 4C + 9F + 7A |
| Cost | Free — no sign-up, no download |
How to use the Meal Calorie Calculator
- 1Read the macros from the nutrition label.
- 2Enter grams of each macronutrient.
- 3Read total calories and the split.
Inputs explained
- Protein(g)
- Enter the protein in g.
- Carbohydrate(g)
- Enter the carbohydrate in g.
- Fat(g)
- Enter the fat in g.
- Alcohol(g)
- Enter the alcohol in g.
Worked example
Using the values the calculator loads with:
Inputs
- Protein35 g
- Carbohydrate60 g
- Fat18 g
- Alcohol0 g
Results
- Total calories542 kcal
- From protein140 kcal (26%)
- From carbs240 kcal (44%)
- From fat162 kcal (30%)
- From alcohol0 kcal
Frequently asked questions
Why do labels differ slightly?
Manufacturers may use Atwater specific factors or round values.
Does fibre count?
Fibre contributes about 2 kcal/g; most labels already account for it.
What do I need to enter into the Meal Calorie Calculator?
Just 4 values: protein, carbohydrate, fat, alcohol. Every field starts with a realistic example, so you can change one number at a time and watch the result update instantly.
How does the Meal Calorie Calculator work out the answer?
Protein and carbs give 4 kcal per gram, fat 9 and alcohol 7 — adding them gives total meal calories. It applies the formula kcal = 4P + 4C + 9F + 7A and shows the working so you can check each step by hand.
Is the Meal Calorie Calculator free, and do I need an account?
It is completely free with no sign-up, no download and no usage limit. Everything is calculated in your browser, so the numbers you type never leave your device.
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.