How to Count Calories: A Simple Step-by-Step Guide

To count calories, you need three things: know your daily calorie needs, set a goal (a calorie deficit, maintenance, or a calorie surplus), and log everything you eat and drink. The rest comes with practice — after a few weeks, you'll be able to estimate most servings by eye, and tracking will take just a few minutes a day.

Don't worry, this isn't a math test. Below, you'll find the whole process in five steps: from calculating your daily calorie needs and logging meals to avoiding the mistakes that make calorie counting “not work.”

Step 1: Calculate your daily calorie needs

Your daily calorie needs are the number of calories you burn in a day. Start with your BMR (basal metabolic rate) — the energy your body needs at rest just to function. It's most often calculated using the Mifflin-St Jeor equation:

• women: 10 × body weight (kg) + 6.25 × height (cm) − 5 × age − 161,
• men: 10 × body weight (kg) + 6.25 × height (cm) − 5 × age + 5.

Multiply the result by your activity factor (PAL):

Example: woman, 30 years old, 165 cm, 68 kg, office job and two workouts a week. BMR = 680 + 1031 − 150 − 161 = about 1400 kcal. Daily calorie needs = 1400 × 1.375 = about 1925 kcal a day.

Example: man, 35 years old, 180 cm, 85 kg, four workouts a week. BMR = 850 + 1125 − 175 + 5 = 1805 kcal. Daily calorie needs = 1805 × 1.55 = about 2800 kcal a day.

This is an estimate — your actual daily calorie needs may differ by about 10% in either direction. Treat the result as a starting point and check it against your weight after a few weeks. Find more equations and examples in our guide on how to calculate your daily calorie needs, or get a result in seconds with our daily calorie needs calculator.

Step 2: Set your calorie goal

Now decide what you want to achieve:

• you want to lose weight — subtract 300–500 kcal a day. A 500 kcal deficit corresponds to about 0.5 kg less body fat per week,
• you want to maintain your weight — eat roughly the number of calories your body needs,
• you're building muscle — add 150–300 kcal and do strength training.

The woman in the example who wants to lose weight would aim for about 1450–1600 kcal a day. We've explained how to choose a goal and when to adjust it in our guide on how to set a calorie goal. For safe weight loss, read our article about the calorie deficit.

Without consulting a specialist, don't go below about 1200 kcal (women) or 1500 kcal (men). A deficit that's too large is hard to maintain, and your body may lose not only fat but also muscle.

Step 3: Log everything you eat and drink

This is the most important step — and the one that's easiest to give up on. Every meal, snack, and drink counts, including “just a piece” and “just a sip.” You have a few options:

1. Food label — check whether the nutrition information is listed per 100 g or per serving, then calculate it for the amount you eat.
2. Barcode — the app will read the product's nutrition information and log it for you. For tips on getting the serving size right, read our guide on how to scan a product barcode.
3. Kitchen scale — the most accurate method, especially at the beginning.
4. Household measures — tablespoon, cup, slice, handful.
5. Meal photo — the app will recognize the dish and estimate the serving. This works well for restaurant meals and dishes with many ingredients.

Household measures are less accurate than a scale, but they're more than enough for everyday use:

Step 4: Keep an eye on your macronutrients, especially protein

Calories aren't everything — it's worth knowing where they come from:

• protein and carbs — about 4 kcal per 1 g,
• fat - about 9 kcal per 1 g,
• alcohol - about 7 kcal per 1 g.

Protein is the most important. It helps you maintain muscle during weight loss and keeps you feeling full, making it easier to stick to your plan. Find out how much you need in our article on how much protein to eat each day. To learn how to calculate the macros in a specific meal, see our guide on how to calculate a meal’s macronutrients.

Step 5: Check your progress and adjust

Weigh yourself under the same conditions each time, ideally in the morning, after using the bathroom and before breakfast. Look at your weekly average rather than individual weigh-ins: your weight can fluctuate by 1-2 kg from day to day because of water, salt, and what’s in your gut. That’s not fat, so don’t panic.

If your weight hasn’t changed after 2-3 weeks and you’ve been logging everything consistently, lower your calorie goal by 100-200 kcal or add more movement, such as longer walks. If you’re losing weight faster than about 1 kg per week, eat a little more.

Common calorie-counting mistakes

If you feel like “calorie counting isn’t working,” check whether you’re falling into any of these common traps:

• Cooking oil and sauces - a tablespoon of oil in the pan has about 90 kcal, while salad dressings and pasta sauces can have 100-200 kcal per serving.
• Drinks - juice, coffee with syrup, beer, or wine can easily add 300-500 kcal a day.
• Snacking - a handful of nuts, a piece of chocolate, or leftovers from your child’s plate count too.
• Weighing food before and after cooking - uncooked white rice has about 350-360 kcal per 100 g, while cooked rice has about 130 kcal. Uncooked pasta has about 350-370 kcal per 100 g, while cooked pasta has about 150-160 kcal. Getting this wrong can more than double or halve your total.
• Weekends - five days in a calorie deficit and two “off” days can wipe out your weekly calorie deficit.
• Logging from memory at night - snacks are easy to forget. It’s better to log them right after you eat.

How do you count calories without weighing food?

Not everyone has the time or wants to weigh every meal - and you don’t have to. One good approach is to weigh your food for the first 2-3 weeks to learn serving sizes, then estimate by eye and use photos. We explain a simple system using your hand, fist, and thumb in our guide on estimating a serving without a scale.

With the EatSee app, take a photo of your plate and AI identifies the dish, estimates the serving, and logs the calories and macros in your food diary in seconds. You can also say what you’re eating in a sentence, or add store-bought products by scanning their barcode. See how the photo calorie tracker works.

Photo-based estimates are always approximate - and that’s okay. It’s better to log a meal approximately than not log it at all. Consistency matters, not getting the calorie count exactly right.

Is calorie counting for everyone?

Calorie counting is a tool, not an obligation. It can help you understand how much you’re really eating and can be useful for weight loss or muscle gain. However, it isn’t a good idea for people who have or have had an eating disorder, or if the numbers start causing stress or guilt.

If you have a chronic condition, are pregnant, or are breastfeeding, set your calorie goal with a doctor or dietitian.

This article is for informational purposes only and does not replace advice from a doctor or dietitian. Written by the EatSee editorial team. Editorial policy.