Calorie Calculator

How are Daily Calories Calculated?

The Calorie Calculator uses the Mifflin-St Jeor equation to estimate your Basal Metabolic Rate (BMR):

BMR (men) = 10 × weight (kg) + 6.25 × height (cm) – 5 × age (y) + 5
BMR (women) = 10 × weight (kg) + 6.25 × height (cm) – 5 × age (y) – 161

Your daily calorie needs are then calculated by multiplying BMR by an activity factor:

  • Sedentary: BMR × 1.2
  • Light: BMR × 1.375
  • Moderate: BMR × 1.55
  • Active: BMR × 1.725
  • Very Active: BMR × 1.9

Example: A 30-year-old woman, 165 cm tall, 60 kg, moderate activity:

BMR = 10 × 60 + 6.25 × 165 – 5 × 30 – 161 = 1341.25
Calories = 1341.25 × 1.55 = 2078

FAQs

  • How accurate is the calorie calculator?
    The calculator provides a good estimate using the Mifflin-St Jeor equation, but individual needs may vary based on metabolism, muscle mass, and other factors.
  • What is BMR?
    BMR (Basal Metabolic Rate) is the number of calories your body needs at rest to maintain vital functions. The calorie calculator uses BMR as a base for total daily needs.
  • How can I use this for weight loss?
    To lose weight, consume fewer calories than your daily needs. A deficit of 500 calories per day typically results in about 0.5 kg (1 lb) weight loss per week.
  • What are the limitations of calorie estimates?
    Estimates do not account for all individual differences (e.g., genetics, medical conditions). Use as a guideline and consult a professional for personalized advice.

Calorie Calculator