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Calculators
Calculate your Basal Metabolic Rate (BMR) — the number of calories your body burns at complete rest. Supports Mifflin-St Jeor, Harris-Benedict, and Katch-McArdle formulas.
Follow these simple steps to get instant, accurate results directly in your browser:
Select biological sex (male or female) and input your age.
Input your height and body weight in metric or imperial units.
Review your resting daily calorie burn and compare against activity multipliers.
The BMR Calculator (Basal Metabolic Rate) estimates the number of calories your body burns every day at complete rest to sustain vital life functions (such as breathing, circulation, cellular production, and brain activity).
The calculator implements the clinically validated Mifflin-St Jeor Equation—widely acknowledged by the Academy of Nutrition and Dietetics as the most accurate formula for estimating resting metabolic rate in healthy adults—alongside the classic Harris-Benedict formula for comparative analysis.
All physiological calculations run client-side in your web browser. Your age, gender, weight, and biometric data remain processed locally in your browser on your device.
Disclaimer: This tool provides general estimates for informational purposes only and does not constitute medical advice. Consult a healthcare professional before making health or fitness decisions.
Men: BMR = (10 * weight in kg) + (6.25 * height in cm) - (5 * age in years) + 5
Women: BMR = (10 * weight in kg) + (6.25 * height in cm) - (5 * age in years) - 161Published in the American Journal of Clinical Nutrition (1990), this equation provides the most reliable estimation of resting energy expenditure.
Male, Age 30, Weight = 80 kg, Height = 180 cm BMR = (10 * 80) + (6.25 * 180) - (5 * 30) + 5 BMR = 800 + 1125 - 150 + 5 = 1,780 kcal/day at rest.
Our calculation methodologies adhere to published guidelines from authoritative government agencies and standards bodies:
Uses the modern gold-standard clinical formula for resting metabolic rate.
Supports metric (kg, cm) and imperial (lbs, inches) seamlessly.
Shows projected total expenditure across sedentary, moderate, and intense activity tiers.
Processes biometrics locally in browser memory with zero server uploads.
Establish your baseline resting metabolic floor to design safe, sustainable weight loss deficits.
Determine the minimum energy required before factoring in physical exercise and training.
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