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Calorie Calculator— Free & Private

Estimate daily calorie needs based on your age, weight, height, and activity level.

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Daily Maintenance

2,507kcal

BMR (base metabolic rate)1,618
Maintenance2,507
Mild weight loss (−250 kcal)2,257
Weight loss (−500 kcal)2,007
Mild weight gain (+250 kcal)2,757
Weight gain (+500 kcal)3,007

All calculations happen in your browser. No data stored.

What Is a Calorie Calculator?

A calorie calculator estimates the number of calories your body needs per day based on your age, sex, weight, height, and physical activity level. Knowing your daily caloric requirement helps you plan meals for weight maintenance, fat loss, or muscle gain. Our calculator uses the Mifflin-St Jeor equation, which is considered one of the most accurate formulas for estimating resting metabolic rate. All computation happens locally in your browser.

How to Use Calorie Calculator

  1. Enter your details

    Input your age, sex, weight, and height.

  2. Select activity level

    Choose your typical activity level from sedentary to very active.

  3. Set your goal

    Pick whether you want to maintain weight, lose weight, or gain weight.

  4. View daily calories

    See your recommended daily calorie intake for your selected goal.

Why Use Our Calorie Calculator?

Uses the Mifflin-St Jeor equation for accuracy
Accounts for five different activity levels
Provides targets for maintenance, weight loss, and weight gain
Shows calorie breakdown for different goal intensities
No personal health data stored or transmitted
Supports both metric and imperial measurements
Instant calculations with clear visual results

Frequently Asked Questions

What formula does the calorie calculator use?

It uses the Mifflin-St Jeor equation: (10 x weight in kg) + (6.25 x height in cm) - (5 x age) + sex factor, then multiplied by an activity factor to estimate total daily energy needs.

How many calories should I eat to lose weight?

A common approach is a deficit of 500 calories per day below your maintenance level, which typically results in about 1 pound (0.45 kg) of weight loss per week.

How accurate is an online calorie calculator?

These calculators provide a reasonable starting estimate. Individual metabolism varies based on genetics, body composition, and other factors, so you may need to adjust based on real-world results.