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ShapeUpAmerica.com is for informational purposes only. The calculators and tools provided are not a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions regarding a medical condition.

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CalculatorsNutrition & DietBMR Calculator
Verified Formula
Last Review: March 2024

BMR Calculator

Basal Metabolic Rate estimator using Mifflin-St Jeor.

Biometric Inputs

Real-time clinical computation active

Awaiting Data
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Enter biometric metrics to generate report

This assessment provides statistical probability and mathematical interpretation based on validated clinical equations. It is not a diagnostic tool.

Scientific Context

BMR is the amount of energy expended while at rest in a neutrally temperate environment. It is the minimal energy needed to keep your body functioning.

Mathematical Formula

Mifflin-St Jeor Equation

Behind the Math

The Mifflin-St Jeor formula we use was developed in 1990. It remains the clinical gold standard today because it was tested on much more diverse, modern populations than the 1919 Harris-Benedict equations.

Expert Tip

Think of your BMR as your 'survival' needs. You should almost never eat below this number, as your body needs this energy just to keep your heart pumping and lungs breathing while at rest.

Primary Sources & Citations

  • 1

    Mifflin MD, St Jeor ST, Hill LA, Scott BJ, Daugherty SA, Koh YO. A new predictive equation for resting energy expenditure in healthy individuals.

  • 2

    Academy of Nutrition and Dietetics. Estimating Energy Needs.

Primary Use
Health Screening
Standard
WHO Guidelines
Complexity
Clinical Grade

Frequently Asked Questions

Metric Recommendations

TDEE Calculator

Total Daily Energy Expenditure based on activity.

Macro Split Calculator

Optimize protein, fat, and carb ratios.

Protein Intake Calculator

Calculate daily protein needs for your activity level.

Water Intake Calculator

Daily hydration needs based on weight and activity.

Sodium Intake Estimator

Recommended daily sodium limits.

Daily Fiber Goal

Recommended fiber intake by age and calories.

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