BMR Calculator
Calculate your Basal Metabolic Rate (BMR) - the number of calories your body burns at rest
Your Basal Metabolic Rate (BMR) represents the number of calories your body needs to maintain basic physiological functions while at rest. This includes breathing, circulation, nutrient processing, and cell production. Knowing your BMR is the starting point for any weight management plan.
Calculator Inputs
Choose your preferred unit system
Gender is used to determine metabolic rate
Enter your age in years
Enter your weight
Enter your height
Results
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How It Works
This calculator uses the Mifflin-St Jeor equation, which is widely considered the most accurate method for estimating BMR. It takes into account your gender, age, weight, and height to determine your baseline caloric needs.
Tips & Best Practices
- •BMR accounts for about 60-75% of your total daily energy expenditure (TDEE)
- •Muscle mass increases BMR - strength training can help raise your metabolism
- •BMR naturally decreases with age as muscle mass tends to decline
- •Use your BMR to calculate your TDEE (Total Daily Energy Expenditure) for a complete picture
- •Never eat below your BMR without medical supervision
Frequently Asked Questions
What is BMR?
BMR stands for Basal Metabolic Rate. It is the number of calories your body burns while at complete rest to maintain vital functions like breathing and keeping your heart beating.
How is BMR different from RMR?
BMR (Basal Metabolic Rate) and RMR (Resting Metabolic Rate) are often used interchangeably, but BMR is measured under stricter conditions (after sleeping and fasting). RMR is slightly less restrictive and typically about 10% higher than BMR.
Does muscle affect BMR?
Yes! Muscle tissue burns more calories at rest than fat tissue. Increasing your muscle mass through resistance training is one of the best ways to increase your BMR.
Should I eat my BMR calories?
Generally, yes. Your BMR represents the minimum energy required for your organs to function. Eating significantly below this number can slow down your metabolism and cause health issues.
Guides & Articles
Beyond BMI: The Truth About Body Composition in 2026
BMI is a useful screening tool, but it's not a diagnosis. We explore Body Fat %, TDEE, and the metrics that actually define metabolic health.
The Data-Driven Pregnancy: Understanding Due Dates and Fertility Windows
Conception and pregnancy are biological processes governed by timing. We explain the math of ovulation windows and the Naegele's Rule for due dates.
The Science of Energy Balance: TDEE, BMR, and Metabolism
Why do diets fail? Because they ignore the baseline data. Learn how to calculate your energy needs and manipulate them for weight loss or muscle gain.
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