Calorie Calculator

Find out how many calories you burn each day and how many to eat to maintain, lose or gain weight.

Informational only, not medical advice. Talk to a doctor.

How it works

We first estimate your basal metabolic rate (BMR), the energy your body uses at rest, with the Mifflin-St Jeor equation.

BMR is multiplied by an activity factor to get your total daily energy expenditure (TDEE), or maintenance calories.

If you know your body fat percentage, the Katch-McArdle equation gives a second estimate based on lean mass.

Formula

Men: BMR = 10 × kg + 6.25 × cm − 5 × age + 5 Women: BMR = 10 × kg + 6.25 × cm − 5 × age − 161 TDEE = BMR × activity factor

Where:

kg, cm
= Weight and height
activity factor
= 1.2 sedentary to 1.9 extra active

Worked example

A 30-year-old man, 180 cm (5'11") and 80 kg (176 lb), who is sedentary.

BMR = 800 + 1,125 − 150 + 5 = 1,780 kcal. Maintenance = 1,780 × 1.2 = 2,136 kcal per day.

Mastering Your Daily Energy Needs

Understanding your Total Daily Energy Expenditure (TDEE) provides the baseline for any nutritional strategy, whether you want to maintain your current weight or improve your body composition. This number accounts for your basal metabolism, the thermic effect of the food you digest, and all physical activity from walking to the office to intense gym sessions. Knowing this baseline prevents the frustration of hidden calories or unintentional overeating that can stall progress even when you think you are eating healthy.

It is helpful to treat the result as a dynamic starting point rather than a rigid rule. Factors like stress levels, sleep quality, and changes in lean muscle mass can cause your actual energy needs to fluctuate slightly from week to week. Monitoring your weight trends over fourteen to twenty-one days while eating at your calculated maintenance level will help you verify if the number is accurate for your unique physiology and lifestyle.

Choosing the Right Calorie Tool

This specific calculator is designed for finding your maintenance baseline and determining daily macronutrient targets for long-term health. It differs from the Food Calorie Calculator, which is used for logging specific meals, and the Weight Loss Calculator, which focuses on creating a deficit plan with a target end date. Use this tool when you want to understand your body's ongoing energy requirements or when you are transitioning out of a diet phase into a maintenance period.

Avoid the common error of underestimating your activity level, which can lead to fatigue if you aren't eating enough to support your movements. Conversely, overestimating activity is a frequent reason why weight loss plateaus occur. Be honest about your daily habits to get the most useful and accurate results from the formula.

Frequently asked questions

Most people overestimate. If you have a desk job and work out a few times a week, “Light” or “Moderate” is usually right.

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For informational purposes only. This calculator does not provide medical advice. Consult a qualified professional before making decisions based on these results.