BMR Calculator

Determine your Basal Metabolic Rate (BMR) to establish a baseline for weight loss, maintenance, or gain goals.

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Deep Dive into Basal Metabolism

Learn the science behind your body's resting energy expenditure and the formulas used to calculate it.

What is BMR?

Basal Metabolic Rate (BMR) is the amount of energy your body needs to maintain basic, vital functions at complete rest, like breathing and blood circulation. It accounts for ~70% of daily calorie burn.

BMR vs. RMR

BMR is measured under strict lab conditions (full rest, fasting). Resting Metabolic Rate (RMR) uses less strict criteria and is the more common, practical term for calories burned at rest.

Mifflin-St Jeor Formula

Key Variables:m=mass (kg), h=height (cm), a=age (years), s=+5 for men / -161 for women.

Physiology & Organs

The BMR is driven by internal organs, with the Liver (~27%) and Brain (~19%) being the largest energy consumers. Metabolism involves energy-releasing Catabolism and energy-requiring Anabolism.

Health & Fitness

Explore Other Metabolic Tools

Calculate your BMI, track calories, or check your steps-to-calorie conversion with these related tools.

BMI Calculator

WHR Calculator

Steps to Calorie Calculator

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Frequently Asked Questions (FAQs)

Get clarity on what BMR is, how it differs from RMR, and how you can influence it.

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Basal Metabolic Rate (BMR) is the amount of energy your body needs to maintain basic bodily functions at rest, such as breathing, blood circulation, body temperature control, cell growth, and brain function. It's the energy your body expends when you are completely at rest.

Your BMR accounts for about 70% of your daily calorie expenditure. A higher BMR means your body burns more calories at rest, which significantly influences whether you maintain, gain, or lose weight.

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BMR and RMR are very similar and often used interchangeably. BMR is measured under strict, clinical conditions (complete rest, fasting). RMR is a more common measurement that uses less strict criteria and is typically used for practical daily planning.