📖 How to Use This Daily Calorie Needs Calculator
1
Choose your unit system - Select Metric (cm/kg) or Imperial (ft/in/lbs).
2
Enter your measurements - Height, weight, age, and select your gender.
3
Select activity level - How active are you during a typical week?
4
Choose your goal - Weight loss, maintenance, or weight gain.
5
Click "Calculate Calories" - Get your BMR, TDEE, and recommended daily calorie intake.
📚 Understanding BMR and TDEE
BMR (Basal Metabolic Rate) is the number of calories your body burns at complete rest to maintain basic vital functions like breathing, circulation, and cell production. BMR accounts for approximately 60-75% of your total daily energy expenditure.
TDEE (Total Daily Energy Expenditure) is your BMR multiplied by an activity factor that accounts for your daily physical activity. This is the number of calories you need to maintain your current weight.
🧮 Mifflin-St Jeor BMR Formula
For Men: BMR = (10 × weight in kg) + (6.25 × height in cm) - (5 × age) + 5
For Women: BMR = (10 × weight in kg) + (6.25 × height in cm) - (5 × age) - 161
🏃 Activity Level Definitions
- Sedentary (1.2): Desk job, little or no exercise
- Lightly active (1.375): Light exercise 1-3 days/week
- Moderately active (1.55): Moderate exercise 3-5 days/week
- Very active (1.725): Hard exercise 6-7 days/week
- Super active (1.9): Physical job + intense daily exercise
❓ Frequently Asked Questions
How accurate is the Mifflin-St Jeor equation?
The Mifflin-St Jeor equation is considered the most accurate BMR formula for the general population, with an accuracy of about 90% compared to indirect calorimetry.
Why do my calorie needs differ from someone with the same stats?
Individual factors like muscle mass, body composition, genetics, hormones, and even gut bacteria affect metabolic rate.
Should I eat back exercise calories?
For moderate exercise (30-60 minutes), you generally don't need to eat back calories. For intense exercise, eat additional calories for recovery.
Can I increase my BMR?
Yes! Building muscle through strength training, eating enough protein, staying hydrated, and getting adequate sleep can help increase your metabolic rate.