How accurate is the life expectancy calculator?

This calculator uses baseline statistical data from the World Health Organization (WHO) and national health institutes, adjusted by peer-reviewed lifestyle modifiers. It is an educational estimate, not a medical prediction.

Does this calculator store my personal data?

No. All calculations are performed locally in your browser using Vanilla JavaScript. No data is sent to any server, ensuring 100% privacy.

BMR Calculator – Affivance | Basal Metabolic Rate & TDEE Tool

Affivance

BMR Calculator

Basal Metabolic Rate & TDEE · Mifflin-St Jeor

What is BMR?

Basal Metabolic Rate (BMR) is the number of calories your body needs at rest to maintain vital functions like breathing, circulation, and cell production.

What is TDEE?

Total Daily Energy Expenditure (TDEE) is your BMR multiplied by an activity factor. It estimates total calories burned per day.

How is BMR Calculated?

We use the Mifflin‑St Jeor equation:
Male: (10×weight) + (6.25×height) − (5×age) + 5
Female: (10×weight) + (6.25×height) − (5×age) − 161

Difference Between BMR and BMI

BMR measures calorie expenditure, while BMI (Body Mass Index) is a ratio of weight to height. BMR is more relevant for nutrition planning.

How to Increase Metabolism

Build muscle, stay hydrated, eat protein‑rich meals, get quality sleep, and incorporate high‑intensity exercise.

Factors Affecting BMR

Age, gender, muscle mass, genetics, hormones, and environmental temperature all influence BMR.

Frequently Asked Questions

1. Is BMR the same for everyone? No, it varies by age, sex, weight, and muscle mass.

2. How accurate is the Mifflin‑St Jeor equation? It is one of the most reliable equations for healthy adults.

3. Can I use this calculator if I’m pregnant? No, pregnancy alters metabolism; consult your doctor.

4. Should I eat exactly my BMR? No, BMR is the baseline; you need additional calories for daily activity.

5. What is a healthy weight loss rate? 0.5‑1 kg per week is generally safe.

6. How often should I recalculate BMR? Every 4‑6 weeks or after significant weight change.

7. Does muscle mass increase BMR? Yes, muscle tissue burns more calories than fat.

8. Can I use this for meal planning? It provides a calorie baseline; adjust based on goals.

9. Why is my BMR different from my friend’s? Differences in body composition, age, and genetics.

10. What is the best way to measure activity level? Be honest about your daily movement; choose the closest category.

Medical Disclaimer
This calculator provides estimates using the Mifflin‑St Jeor Equation and is intended for educational and informational purposes only. Results should not be considered medical advice, diagnosis, or treatment. Individual calorie needs vary based on health conditions, body composition, medications, pregnancy, age, and other factors. Always consult a qualified physician or registered dietitian before making significant dietary, exercise, or weight‑management decisions.