How to Use This Calorie Calculator

The form only takes a minute, but a couple of choices deserve more thought than the others. Here's how to get a result you can actually use:

Enter your current information. Use your current weight rather than a goal weight. Your age, sex, height, and weight help estimate how many Calories you burn at rest.
Give a rough body-fat estimate. Low, Medium, or High is enough. This choice does not change your calorie estimate; it helps set a more appropriate protein minimum. If you are not sure, Medium is a reasonable place to start.
Choose your usual activity level. Think about an ordinary month, not your busiest recent week. The activity-level section below breaks down each option.
Set your goal. Choose whether you want to lose fat, maintain weight, or build muscle. For weight change, you can also choose a target weekly rate.
Review the result. Check your daily calorie target and suggested amounts for protein, carbohydrates, and fat, then adjust your inputs if needed.
Generate a meal plan. Turn your calorie and macro targets into a personalized meal plan that you can customize.

Choosing Your Activity Level

Activity affects your estimate more than any other input, and it's the hardest one to get right. Pick the option that matches your typical week, not your most ambitious one. Each level multiplies your Basal Metabolic Rate (BMR), the energy you burn at rest, by a progressively larger factor.

Sedentary: Desk Job, Light Exercise

You sit for most of the day (desk job, remote work, studying)
You work out occasionally, but light walking is most of your movement
Under ~30 minutes of moderate activity on a typical day
Calorie multiplier: BMR × 1.2

Lightly Active: Workout 3-4 Times/Week

You train a few times in a typical week, or you're on your feet a good part of the day (teaching, retail)
Your workouts are moderate: weights, classes, or brisk walks
Outside of workouts, your day is mostly seated
Calorie multiplier: BMR × 1.375

Moderately Active: Daily Movement, Frequent Exercise

You're active every day, not just on gym days
You exercise most days, or mix 2-3 intense sessions with plenty of daily walking
Calorie multiplier: BMR × 1.55

Very Athletic: Vigorous Exercise Most Days

Consistent vigorous training, a physically demanding job, or both
Roughly 4-5 intense workouts a week (running, HIIT, competitive sports)
More than ~180 minutes of vigorous activity per week
Calorie multiplier: BMR × 1.725

Extremely Athletic: Intense Daily Training

Intense training nearly every day, often on top of a physical job
More than ~300 minutes of vigorous activity per week
Fits relatively few people: think professional athletes or construction workers who also train
Calorie multiplier: BMR × 1.9

If you're between two levels, lean toward your goal: pick the lower one if you want to lose weight, or the higher one if you're trying to gain. That way any error works in your favor.

How We Calculate Your Daily Calorie Needs

As a general reference, most adult women need roughly 1,600 to 2,400 Calories a day, and most adult men need about 2,000 to 3,000, according to the Dietary Guidelines for Americans. The calculator's job is to estimate your personal number.

The calculator works in three stages: estimate the energy your body uses at rest, account for your usual activity, and adjust the result for your chosen goal.

1. Estimate Your Resting Calorie Needs

We use the Mifflin-St Jeor equation (Mifflin et al., 1990) to estimate Basal Metabolic Rate (BMR), or the energy needed to support basic functions at rest. A systematic review found it more reliable overall than other commonly used equations (Frankenfield et al., 2005), and the FAQ below compares the common alternatives. The equation uses weight in kilograms (W), height in centimeters (H), and age in years (A):

Male setting: BMR = 10W + 6.25H - 5A + 5
Female setting: BMR = 10W + 6.25H - 5A - 161

For the Non-Binary setting, we average the male and female results. This is an imperfect solution, so pick the setting that fits you best, and feel free to adjust your targets based on your progress.

An Example Calculation

For a 30-year-old using the Female setting who weighs 150 lb (68 kg) and is 5 ft 6 in (167.6 cm), the resting estimate is:

(10 × 68) + (6.25 × 167.6) - (5 × 30) - 161 = 1,416.5

That's about 1,417 Calories per day at rest. It's not a full daily target yet, because it doesn't include any movement or exercise.

2. Account for Your Activity

Next, we multiply your resting estimate by the multiplier for your activity level, from 1.2 up to 1.9. The exact numbers are in the breakdown above.

In the example above, selecting Active daily, frequent exercise gives an estimated maintenance level of about 2,196 Calories per day (1,416.5 × 1.55). Maintenance calories are sometimes called Total Daily Energy Expenditure; our TDEE calculator covers that concept in more depth.

3. Adjust for Your Goal

If you choose Maintain weight, the activity-adjusted estimate is your starting target. Choosing Lose fat or Build muscle moves the target down or up based on the weekly rate you select. A one-pound-per-week setting, for example, starts with an adjustment of about 500 Calories per day.

Treat that adjustment as a starting point, not a promise about the scale. As your weight changes, so does the energy you burn, and the simple 3,500-Calorie-per-pound rule doesn't capture that shift over time (Hall et al., 2011).

How We Suggest Your Macros

Along with your calorie target, we suggest daily minimums for protein, carbohydrates, and fat rather than exact ratios: protein scales with your lean mass and goal (that's what the body-fat estimate is for), carbs scale with your activity level, and fat has a floor to support hormone production and nutrient absorption. The idea is to make sure you get enough of each while leaving flexibility for foods you enjoy. Our macro calculator covers the reasoning and research behind these suggestions in more depth.

How to Make the Estimate Useful

Treat the result as a short experiment. Genetics, sleep, hormones, training, spontaneous movement, and imperfect food tracking can all create a gap between a formula and your actual needs.

Start with the suggested target and stick to it as consistently as you can.
Give it two to three weeks. Watch your average weight trend along with hunger, energy, recovery, and training performance.
If the trend doesn't match your goal, make a small calorie adjustment and run the experiment again.

Recalculate after meaningful weight loss or gain, or whenever your job, training schedule, or normal amount of movement changes. Adjusting based on real results beats pretending the first estimate was exact.

Turn Your Calorie Target Into Meals

A daily number is only helpful if it translates into food you can live with. After calculating your target, choose a diet style and use the Generate Meal Plan button to build meals and recipes around your calorie and macro targets.

You can keep the suggested numbers, customize them, swap meals, and adjust portions. The target gives the plan direction without requiring every day or every meal to look exactly the same.

Create a Free Meal Plan

Frequently Asked Questions

How accurate is this calorie calculator?

It provides an evidence-based estimate, not a measurement. Most people's actual needs fall within roughly 100 to 300 Calories of the result, but no calculator can account for every individual difference.

Use the result consistently for two to three weeks, compare it with your weight trend and how you feel, and make a small adjustment if your results don't match your goal.

What about the Harris-Benedict and Katch-McArdle equations?

The revised Harris-Benedict equation uses the same inputs as Mifflin-St Jeor with different coefficients (Roza & Shizgal, 1984), and tends to estimate slightly higher:

Male equation: BMR = 88.362 + 13.397W + 4.799H - 5.677A
Female equation: BMR = 447.593 + 9.247W + 3.098H - 4.330A

Katch-McArdle instead estimates resting Calories from lean body mass (L): BMR = 370 + 21.6L. Lean mass matters: in one study of competitive weightlifters, it was the only significant predictor of resting energy use (Joseph et al., 2017), so this formula can work well for very lean or very muscular people.

The catch: you need an accurate lean-mass number, and a guessed body-fat percentage just moves the error somewhere else. That's why we stick with Mifflin-St Jeor and use your rough body-fat choice to set protein suggestions instead.

Is a Calorie the same as a kcal?

Yes. In nutrition, one food Calorie, written with a capital C, is one kilocalorie or kcal. A target of 2,000 Calories per day is the same as 2,000 kcal per day (Osilla et al., 2022).

Can this calculator set a calorie deficit?

Yes. Choose Lose fat and a target rate of weight change. The calculator reduces your estimated maintenance calories to give you a starting daily target. If weight loss is your main focus, our calorie deficit calculator starts with that goal selected.

Do I need to eat the same number of calories every day?

No. Day-to-day intake can vary. Your average intake over a week is usually more useful than hitting the exact same number every day, as long as it still matches your goal.

This calculator provides an estimate for informational purposes and is not a substitute for professional medical advice. Individual calorie needs can vary for reasons the calculator cannot measure. Consult a healthcare professional or registered dietitian before making significant changes to your diet or exercise routine.

Health & Fitness Calculators

Easily estimate your daily calorie needs, optimize your macronutrient intake, and plan your nutrition with these powerful tools. Whether you're aiming to lose weight, build muscle, or maintain a healthy lifestyle, these calculators will help you make informed decisions tailored to your goals.

BMR Calculator: Estimate your Basal Metabolic Rate to understand how many calories your body needs at rest.
Calorie Deficit Calculator: Determine how many fewer calories you need to eat per day to lose weight effectively and safely.
Macro Calculator: Calculate the optimal ratio of proteins, fats, and carbohydrates based on your fitness goals.
Protein Intake Calculator: Find out how much protein you need daily based on your activity level and fitness objectives.
TDEE Calculator: Calculate your Total Daily Energy Expenditure to know how many calories you burn each day.