What is a BMR Calculator?

A Basal Metabolic Rate (BMR) Calculator is a tool that accurately calculates the number of calories your body will burn on a given day when kept still. Those calories maintain the body's vital functions — like respiration, the flow of the circulatory system, digestion, and cell renovation — even when you're sitting still.

Your BMR is the basis of any weight reduction plan as it is the least amount of energy that your body will require to keep you alive. You can then base your daily calorie allowance on this figure, in order to lose fat, remain stable, or put on muscle, depending on your activity level.

How Does a BMR Calculator Work?

The calculator considers your age, gender, height and weight to estimate how many calories your body needs at rest. The BMR calculators mainly rely on using the Mifflin-St Jeor Equation, arguably the best formula for calculating BMR:

• For Men:
  BMR = (10 × weight in kg) + (6.25 × height in cm) – (5 × age in years) + 5
• For Women:
  BMR = (10 × weight in kg) + (6.25 × height in cm) – (5 × age in years) – 161

After providing total BMR, this calculator can then provide us with TDEE (Total Daily Energy Expenditure). — the number of calories you consume given your activity level at the end of each day. If you are sedentary, moderately active, or very active, the number indicates how many calories you must consume on a daily basis in order to reach your goals.

Why Use a BMR Calculator?

• Eliminates the chance of manual calculation errors.
• Provides science-backed calorie estimates for your body type.
• Serves as the starting point for diet or fitness programs.
• Offers clarity about how much you should eat based on your lifestyle.
• Encourages smarter nutrition choices aligned with your goals.

Whether you’re aiming to lose weight, build muscle, or simply maintain your current body composition, knowing your BMR gives you control over your energy balance and long-term health.

Disclaimer

This calculator is for educational and informational purposes only. Results are estimates based on your inputs and may vary depending on individual health conditions, lifestyle, or provider policies. For personalized health or nutrition advice, please consult a qualified professional.