BMR Calculator

BMR Calculator

Estimate your Basal Metabolic Rate (BMR)—the number of calories your body burns at rest—using the Mifflin-St Jeor Equation.

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Medical Standard
Our calculator uses the Mifflin-St Jeor Equation, which is the current gold standard for estimating calorie needs in healthy adults without specialized medical equipment.
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Master Your Metabolism with MyApexCalc

Whether you are aiming to lose weight, build lean muscle, or simply maintain your current physique, understanding your body’s daily energy requirements is the ultimate starting point. Every day, your body burns a significant number of calories simply keeping your organs functioning, circulating blood, and maintaining body temperature—even if you stay in bed all day. Our free online bmr calculator removes the guesswork by establishing your baseline energy needs in seconds.

The Science of Metabolism: How Your BMR is Calculated

Your Basal Metabolic Rate (BMR) represents the absolute minimum number of calories your body needs to survive at rest. Our basal metabolic rate calculator utilizes the most accurate, medically recognized formulas to determine this baseline.

Our metabolic rate calculator supports both the Mifflin-St Jeor Equation (widely considered the most accurate for modern lifestyles) and the classic Harris-Benedict Equation.

The Mifflin-St Jeor Equation

For Men:

BMR = (10 × W) + (6.25 × H) - (5 × A) + 5

For Women:

BMR = (10 × W) + (6.25 × H) - (5 × A) - 161

* W = weight in kilograms, H = height in centimeters, A = age in years.

Once this baseline is established, you can multiply your BMR by an activity factor to determine your Total Daily Energy Expenditure (TDEE). This tells you exactly how many calories you need to consume to hit your target fitness goals.

Why Use the MyApexCalc Calculator for Metabolic Rate?

Instead of guessing your calorie needs or relying on complex manual formulas, MyApexCalc provides a seamless, secure, and instant health dashboard:

  • Dual Formula Support

    Toggle between the modern Mifflin-St Jeor and revised Harris-Benedict formulas to compare baseline estimates across different clinical standards.

  • Metric and Imperial Inputs

    Easily enter your stats in pounds and feet/inches or kilograms and centimeters without needing external conversion tools.

  • Instant TDEE Projections

    View a clear breakdown showing how your baseline calorie burn scales up based on your daily physical activity levels.