What is Basal Metabolic Rate (BMR)?
BMR is the amount of energy (calories) your body burns at complete rest over 24 hours to keep vital organs functioning.
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BMR Calculator Online - Basal Metabolic Rate | 1ClickTools
Calculate your Basal Metabolic Rate (BMR) and daily calorie burn using Harris-Benedict and Mifflin-St Jeor equations. 100% in browser.
About This Tool
Your Basal Metabolic Rate (BMR) represents the foundational calorie expenditure your body requires to maintain breathing, blood circulation, cell production, and brain activity while at complete rest. Understanding your BMR is the essential starting point for designing effective weight loss, muscle gain, or body recomposition diet plans. Our client-side BMR Calculator evaluates your physical profile using the gold-standard Mifflin-St Jeor equation (recognized as the most accurate modern clinical formula) and the classic Harris-Benedict equation. By combining BMR with activity level multipliers (sedentary, light, moderate, active, extra active), it projects your Total Daily Energy Expenditure (TDEE). Because all calculations run locally in client-side JavaScript, your personal age, weight, and fitness parameters remain strictly private on your device.
Frequently Asked Questions
Is my personal fitness data sent to a web server?
No. 1ClickTools calculates BMR 100% locally in your browser memory.
What is the difference between BMR and TDEE?
BMR is your resting calorie burn. TDEE (Total Daily Energy Expenditure) includes calories burned from movement and exercise.
Which BMR formula is most accurate?
The Mifflin-St Jeor equation is considered most accurate by the Academy of Nutrition and Dietetics.
How many calories should I eat to lose 1 pound per week?
A daily deficit of 500 calories below your TDEE results in approximately 1 pound of fat loss per week.
Works on smartphone browsers?
Yes, fully responsive across mobile phones, tablets, and desktops.
Does muscle mass increase BMR?
Yes! Muscle tissue is metabolically active, burning more calories at rest than fat tissue.
Is there any software download required?
No, works directly inside modern web browsers.
Does it cost anything to use?
No, 100% free with no limits.
Is 1ClickTools BMR Calculator free?
Yes, 100% free for personal health tracking.