Basal Energy Expenditure Calculator - BMR & TDEE
Calculate your basal energy expenditure (BEE) and total daily energy expenditure (TDEE) with multiple formulas.
Medical Disclaimer
The health and fitness tools provided on this website are for informational and educational purposes only. The information contained herein is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay in seeking it because of something you have read on this website. The results provided by these tools are estimates based on general formulas and may not apply to your specific situation. If you think you may have a medical emergency, immediately call your doctor or dial emergency services.
About This BEE Calculator
Our Basal Energy Expenditure (BEE) Calculator uses scientifically validated formulas to estimate your daily calorie needs at rest and with activity.
This calculator implements three leading BMR formulas:
1. Mifflin-St Jeor Equation (1990): BEE = 10×weight(kg) + 6.25×height(cm) - 5×age + s (s=+5 for males, -161 for females)
2. Revised Harris-Benedict Equation (1984): Updated version of the classic 1919 formula
3. Katch-McArdle Formula: Uses lean body mass for potentially higher accuracy in athletes
Input ranges: Age 10-120 years, Height 100-250cm (3'3"-8'2"), Weight 30-300kg (66-660lbs), Body fat 3-60% (optional).
- Multiple formula comparison (Mifflin-St Jeor, Harris-Benedict, Katch-McArdle)
- Age-related BMR trend visualization (10-year projection)
- Activity level energy matrix (5 activity levels)
- Weight change prediction (5 goal scenarios)
- Muscle mass impact analysis
- Personalized expert advice & nutrition guidance
Frequently Asked Questions
What is Basal Energy Expenditure (BEE)?
BEE is the number of calories your body needs to maintain basic physiological functions at rest, including breathing, circulation, and cell production. It accounts for about 60-70% of total daily energy expenditure.
Which BMR formula is most accurate?
The Mifflin-St Jeor equation is generally considered the most accurate for the general population, typically within 10% of measured BMR. Katch-McArdle may be more accurate for individuals with known body composition.
How does activity level affect calorie needs?
Your TDEE (Total Daily Energy Expenditure) is calculated by multiplying BEE by an activity factor: sedentary (×1.2), lightly active (×1.375), moderately active (×1.55), very active (×1.725), and extremely active (×1.9).
How often should I recalculate my BEE?
Recalculate your BEE every 3-6 months, or after significant weight changes (±5kg/10lbs), major lifestyle changes, or when you hit a weight loss plateau.
Can BEE help with weight loss?
Yes! Knowing your BEE and TDEE helps you create a sustainable calorie deficit. For healthy weight loss, aim for a 250-500 kcal daily deficit, which leads to 0.25-0.5kg (0.5-1lb) of weight loss per week.
How is BEE calculated with an example?
Let's calculate BEE for a 30-year-old male, 175cm tall, weighing 70kg using Mifflin-St Jeor: BEE = (10×70) + (6.25×175) - (5×30) + 5 = 700 + 1093.75 - 150 + 5 = 1648.75 kcal/day. With moderate activity (×1.55), TDEE = 1649 × 1.55 ≈ 2556 kcal/day.