Calorie Calculator
Estimate your daily calorie needs (TDEE) and Basal Metabolic Rate (BMR) from your age, height, weight, sex, and activity level.
🔒 Processed locally in your browser
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How to use
- Choose Metric (cm/kg) or Imperial (ft, in/lb) using the unit toggle.
- Select your sex and enter your age, height, and weight.
- Pick the activity level that best matches your typical week.
- Your BMR and estimated daily calorie needs (TDEE) update instantly below.
Features
- Uses the Mifflin-St Jeor equation, the modern standard for BMR estimation
- Supports both metric (cm/kg) and imperial (ft+in/lb) units
- Five standard activity levels from sedentary to athlete
- Updates live as you type — no button to press
- 100% client-side — your age, height, and weight never leave your browser
Frequently asked questions
What's the difference between BMR and TDEE?
BMR (Basal Metabolic Rate) is the number of calories your body burns at complete rest just to keep basic functions running. TDEE (Total Daily Energy Expenditure) is BMR multiplied by an activity factor, giving your estimated total calories burned in a day including movement and exercise.
How is BMR calculated here?
This tool uses the Mifflin-St Jeor equation: for men, BMR = 10×weight(kg) + 6.25×height(cm) − 5×age + 5; for women, BMR = 10×weight(kg) + 6.25×height(cm) − 5×age − 161. It's widely considered more accurate than the older Harris-Benedict formula.
Is this medical advice?
No. This calculator provides a general estimate for informational purposes only, not medical or nutritional advice. It doesn't account for individual metabolic variation, medical conditions, or medications. Consult a doctor or registered dietitian before making significant dietary changes.
Which activity level should I choose?
Sedentary means little or no exercise; Light is light exercise 1–3 days a week; Moderate is moderate exercise 3–5 days a week; Heavy is hard exercise 6–7 days a week; Athlete is very intense training or a physically demanding job. Choose the one closest to your typical week, not your best week.
Does this tool store or upload my data?
No. All calculations happen locally in your browser. Your age, height, weight, and activity level are never sent to a server or saved anywhere.