CheckBodyScore
BMR Calculator (Mifflin-St Jeor)
Your Basal Metabolic Rate
What Your BMR Means
BMR is the caloric minimum your body needs just to sustain life.
The Mifflin-St Jeor BMR Calculator
The **BMR Calculator** determines your **Basal Metabolic Rate** (**BMR**), the amount of energy (calories) your body requires to perform basic, life-sustaining functions while at rest. This includes breathing, circulation, and cell production. Understanding your **BMR** is the first, most crucial step in any **weight management** plan, as it sets the baseline for calculating daily **calorie goals**.
The Mifflin-St Jeor Formula
This calculator uses the **Mifflin-St Jeor equation**, widely regarded as the most accurate **BMR formula** for general use, superseding the older Harris-Benedict equation. The formula accounts for **weight**, **height**, **age**, and **gender**:
Where W = weight in kg, H = height in cm, A = age in years, and S is the **Gender Factor** ($+5$ for men, $-161$ for women). The final figure is your daily **resting metabolic rate** in calories.
From BMR to TDEE and Calorie Goals
Your **BMR** represents your caloric minimum. To determine your total daily energy expenditure (**TDEE**), you must multiply your **BMR** by an activity factor. Use our **TDEE Calculator** next to apply your **BMR** result and establish accurate **calorie goals** for **weight loss** or maintenance. Note that BMR is generally $60\%$-$75\%$ of your TDEE.
BMR Calculator FAQs
We use the **Mifflin-St Jeor equation** to determine your **Basal Metabolic Rate** (**BMR**). This modern formula is often preferred for its accuracy over the older methods, providing a reliable baseline for setting **calorie goals** and assessing your **resting metabolic rate**.
The terms **BMR** (Basal Metabolic Rate) and **RMR** (Resting Metabolic Rate) are often used interchangeably. Technically, BMR is measured under stricter conditions (fasted, fully rested). However, the **Mifflin-St Jeor equation** used in this **BMR calculator** provides an estimation very close to your RMR in practical terms for **weight management**.
No. Eating only your **BMR** is generally discouraged as it represents the absolute minimum needed for vital functions. You should always eat above your **BMR** to account for digestion and daily movement. Use our **TDEE Calculator** to find the correct number of calories for your activity level and safe **weight loss** goals.