BMR Calculator

Calculate your Basal Metabolic Rate to understand your body's energy needs at rest

cm
kg
ft
in
lb
Male
Female
1,680
Calories per day at complete rest
2,016
Sedentary
2,310
Light Activity
2,604
Moderate Activity
2,898
Active

Understanding Basal Metabolic Rate

What is BMR?

Basal Metabolic Rate (BMR) is the number of calories your body needs to perform its most basic life-sustaining functions. These include:

  • Breathing and circulation
  • Cell production
  • Nutrient processing
  • Protein synthesis
  • Ion transport

BMR accounts for about 60-75% of your total daily energy expenditure (TDEE).

60-75%
BMR of Total Calories
15-30%
Physical Activity
10%
Food Digestion
5%
Non-Exercise Activity
Mifflin-St Jeor Equation

The most accurate BMR formula used by professionals:

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

This equation is considered the most accurate for calculating BMR in healthy individuals.

Factors That Affect Your BMR

Body Size & Composition
Larger bodies and more muscle mass require more energy at rest.
Gender
Men typically have higher BMR due to greater muscle mass.
Age
Metabolism slows by about 1-2% per decade after age 20.
Genetics
Some people inherit a faster or slower metabolism.
Metabolic Health
Multiple factors influence your metabolic rate
Source: Unsplash
Boosting Your Metabolism

While genetics play a role, you can influence your BMR through lifestyle choices:

Build Muscle Mass
Muscle tissue burns more calories at rest than fat tissue.
Stay Hydrated
Dehydration can slow down your metabolic rate.
Eat Protein-Rich Foods
Protein has a higher thermic effect than carbs or fat.
Prioritize Sleep
Lack of sleep can disrupt metabolic hormones.

BMR and Weight Management

Using BMR for Weight Control

Understanding your BMR is crucial for effective weight management:

  • Weight Loss: Create a calorie deficit below your TDEE
  • Weight Maintenance: Match calorie intake to your TDEE
  • Muscle Gain: Consume calories above your TDEE with strength training
Goal Calorie Adjustment Recommended Approach
Weight Loss 500-1000 calories below TDEE 1-2 lbs/week weight loss
Weight Maintenance Match TDEE Monitor weight monthly
Muscle Gain 250-500 calories above TDEE Strength training + protein
"Understanding my BMR helped me create an effective weight loss plan. I've lost 30 pounds in 5 months by adjusting my calorie intake based on my metabolic rate."
John Smith
Lost 30 pounds
"As a fitness coach, I use BMR calculations with all my clients. It's the foundation for creating personalized nutrition plans that actually work."
Sarah Johnson
Fitness Coach