Calorie Calculator Online
Estimate daily calorie needs based on your age, weight, height, and activity level.
Daily Maintenance
2,507kcal
All calculations happen in your browser. No data stored.
What Is a Calorie Calculator?
Calorie Calculator is a free online tool that estimate daily calorie needs based on your age, weight, height, and activity level. No files are uploaded — everything is processed locally on your device.
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.
Privacy guarantee: Calorie Calculator processes all files directly in your browser using WebAssembly. No data is uploaded to any server, no information is collected, and the tool works offline after loading. Unlimited usage with no signup, no watermarks, and no file size limits.
How to Use Calorie Calculator
Enter your details
Input your age, sex, weight, and height.
Select activity level
Choose your typical activity level from sedentary to very active.
Set your goal
Pick whether you want to maintain weight, lose weight, or gain weight.
Check daily calories
See your recommended daily calorie intake for your selected goal.
Why Use Our Calorie Calculator?
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.
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