BMR Calculator
Calculate your Basal Metabolic Rate to understand your daily caloric needs at rest
BMR Calculator
About BMR Calculator
Basal Metabolic Rate (BMR) is the number of calories your body needs to maintain basic physiological functions while at rest. These functions include breathing, circulation, cell production, nutrient processing, and protein synthesis.
BMR represents the minimum caloric energy needed to sustain life in a resting state. Your actual daily caloric needs will be higher depending on your activity level, typically ranging from 1.2× (sedentary) to 2.0× (very active) your BMR.
This calculator uses the revised Harris-Benedict equation, which is considered more accurate than the original formula. However, individual variations in metabolism, body composition, and other factors can affect your actual BMR. your actual BMR.
Frequently Asked Questions
What factors affect BMR?
BMR is influenced by age, gender, weight, height, and body composition. Muscle mass increases BMR, while fat mass has minimal effect. Other factors include genetics, hormones, and thyroid function.
How accurate is BMR calculation?
BMR calculations are estimates with about 10% accuracy for most people. Individual variations in metabolism, body composition, and health conditions can affect actual BMR. For precise measurements, indirect calorimetry testing is required.
How do I use BMR for weight management?
Multiply your BMR by an activity factor (1.2 for sedentary, 1.375 for light activity, 1.55 for moderate, 1.725 for active, 1.9 for very active) to get your total daily energy expenditure. To lose weight, consume fewer calories; to gain weight, consume more.
Does BMR change with age?
Yes, BMR typically decreases with age, starting around age 20. This decline is partly due to reduced muscle mass and changes in hormonal activity. Regular strength training can help maintain a higher BMR as you age.
What's the difference between BMR and RMR?
BMR (Basal Metabolic Rate) is measured under strict conditions after fasting and complete rest. RMR (Resting Metabolic Rate) is measured under less restrictive conditions and is typically 5-10% higher than BMR. For practical purposes, they're often used interchangeably.
