BMR Calculator
Calculate your Basal Metabolic Rate (BMR) — the minimum energy your body burns at rest to keep vital organs functioning.
BMR Calculator
Basal Metabolic Rate & TDEE Multiplier EngineThe Basal Metabolic Rate (BMR) Calculator estimates your basal metabolic rate—the amount of energy expended while at rest in a neutrally temperate environment, and in a post-absorptive state (meaning that the digestive system is inactive, which requires about 12 hours of fasting).
• Choose your measurement system: Metric Units (Default), US Units, or Other Units.
• Enter your Age (15–80), Gender, Height, and Weight.
• Open + Settings to switch calculation equations (Mifflin-St Jeor, Harris-Benedict, or Katch-McArdle).
Minimum energy required to maintain involuntary vital life processes (heart, brain, lungs, kidneys) at rest.
Daily calorie needs based on activity level
Total Daily Energy Expenditure (TDEE) multipliers applied to your base BMR (1,605 kcal).
| Activity Level | Calorie |
|---|---|
Sedentary: little or no exercise Desk job, minimal movement (1.2x) | 1,926 |
Exercise 1-3 times/week Light workouts, walking (1.375x) | 2,207 |
Exercise 4-5 times/week Regular moderate cardio or lifting (1.465x) | 2,351 |
Daily exercise or intense exercise 3-4 times/week Consistent training routine (1.55x) | 2,488 |
Intense exercise 6-7 times/week High-frequency athletic workouts (1.725x) | 2,769 |
Very intense exercise daily, or physical job Elite training, heavy manual labor (1.9x) | 3,050 |
• Exercise: 15-30 minutes of elevated heart rate activity.
• Intense exercise: 45-120 minutes of elevated heart rate activity.
• Very intense exercise: 2+ hours of elevated heart rate activity.
Visual Energy Output Spectrum (kcal/day)
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Deep Dive: Understanding BMR, RMR & Total Daily Energy Expenditure
Several peer-reviewed formulas exist to estimate Basal Metabolic Rate from basic anthropometric measurements:
Considered the gold standard equation by the Academy of Nutrition and Dietetics with an error rate under 10%.
Men: 10W + 6.25H - 5A + 5
Women: 10W + 6.25H - 5A - 161
Updated from the original 1919 equation to reflect modern population physiology and body dimensions.
Men: 13.397W + 4.799H - 5.677A + 88.362
Women: 9.247W + 3.098H - 4.330A + 447.593
Calculates resting expenditure based on Lean Body Mass (LBM), making it exceptionally accurate for athletes.
LBM: Weight × (1 - BodyFat%/100)
BMR: 370 + (21.6 × LBM)
Understanding BMR Calculator & Formula
The BMR Calculator on CalculatorScale.com is engineered to deliver instant, mathematically verified calculations conforming strictly to standard institutional equations. Whether planning long-term investments, managing household budgets, tracking clinical fitness targets, analyzing academic genetics, calculating veterinary dosages, or converting dimensional units, every calculation updates dynamically in real time without lag.
Every formula used in this tool adheres to certified international standards, including World Health Organization biometric metrics, veterinary clinical guidelines, NIST physical conversion constants, and standard biological equations. Results are computed entirely client-side inside your browser with complete data privacy, ensuring your sensitive numbers and statistics never leave your device.
Our calculators are 100% free with no registration, subscriptions, or paywalls required. You can toggle between imperial and metric units, customize input parameters, export calculation summaries, or embed this calculator directly into your own website or blog.
How to Use the BMR Calculator
- 1 Select your biological gender and enter your current age in years.
- 2 Input your body weight and height in US Imperial (lbs, feet/inches) or Metric units (kg, cm).
- 3 Select your formula preference (Mifflin-St Jeor, Revised Harris-Benedict, or Katch-McArdle if body fat is known).
- 4 Review your calculated Basal Metabolic Rate (BMR) and daily caloric burn across 5 standard physical activity tiers.
BMR Calculator — Frequently Asked Questions
Q1 What is Basal Metabolic Rate (BMR)? ▾
Basal Metabolic Rate is the baseline amount of calories your body burns in a 24-hour period strictly at rest to sustain vital involuntary functions including breathing, blood circulation, cellular repair, and brain activity.
Q2 What is the difference between BMR and TDEE? ▾
BMR accounts only for basal survival calories at complete rest. Total Daily Energy Expenditure (TDEE) multiplies your BMR by an activity factor (1.2 to 1.9) to calculate total calories burned including movement, work, and exercise.
Q3 Can you increase your BMR? ▾
Yes. Increasing lean muscle mass through resistance training raises resting metabolic rate because muscle tissue burns significantly more calories at rest per pound than adipose fat tissue.
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