Basal Metabolic Rate

BMR Calculator - Calculate Your Basal Metabolic Rate

Q: What is BMR?

BMR stands for Basal Metabolic Rate. It represents the minimum number of calories your body needs to survive and perform vital biological functions—like breathing, blood circulation, and cellular repair—while at complete rest, without any activity or digestion.

Q: What is my BMR?

Your individual BMR is determined by your biological characteristics, including your age, weight, height, gender, and muscle-to-fat ratio. You can estimate your BMR using an online BMR calculator which applies standard metabolic equations.

Q: How to calculate BMR?

To calculate BMR, you can use metabolic equations like the Mifflin-St Jeor formula or the revised Harris-Benedict equation. The Mifflin-St Jeor formula is: BMR = 10 × weight (kg) + 6.25 × height (cm) - 5 × age (years) + s, where s is +5 for men and -161 for women.

Q: What does BMR stand for?

BMR stands for Basal Metabolic Rate.

Q: What does BMR mean?

BMR means the baseline level of energy (measured in calories) your body consumes in a 24-hour cycle just to stay alive at rest. It represents the energy expenditure of your internal organs without factoring in exercise, walking, or digesting food.

Q: What is a BMR calculator?

A BMR calculator is an interactive online tool designed to estimate your Basal Metabolic Rate. By entering your gender, age, height, and weight, the tool calculates how many calories you burn at rest using validated biological formulas.

Q: Is a BMR calculator accurate?

Yes, a BMR calculator is highly accurate for the majority of the population as a statistical estimate. However, because standard formulas do not factor in individual muscle mass directly (unless using Katch-McArdle), it may slightly underestimate BMR for muscular athletes and overestimate it for those with higher body fat percentages.

Q: Which is best to track: BMR, BMI, or TDEE?

It depends on your goal. BMR calculates your baseline resting metabolism, TDEE measures your total daily calorie burn including activity, and BMI is a height-to-weight screening ratio. Keeping track of all three provides a comprehensive view of your health and metabolic rate.

Your BMR represents the daily calories your body needs simply to survive at rest, with no physical activity. Fill out the parameters below to view your results.

BMR Calculator

Enter your details below. We support both metric and imperial units.

Estimated Total Daily Energy Expenditure

2,450 kcal/day

Based on your physical details, this represents your estimated maintenance calories—the amount of energy needed to maintain your current weight.

BMR: 1,600 kcal

BMI: 22.4 Normal

Macronutrient Splits

Customize your nutrition macros according to your current diet.

Target Intake Calories: 2,450 kcal

Customize Percentages Total: 100%

Carbs: 35%

Fats: 35%

Protein: 30%

Macronutrient	Ratio	Daily Weight	Energy Content
Carbohydrates	35%	214 g	858 kcal
Fats	35%	95 g	858 kcal
Protein	30%	184 g	735 kcal

Weight Management Goals

Adjusted calorie targets to help you lose weight or build muscle.

Goal	Daily Calories	Adjustment	Weekly Rate
Extreme Weight Loss	1,450 kcal	-1,000 kcal	~2.0 lbs (0.9 kg) loss
Weight Loss (Cutting)	1,950 kcal	-500 kcal	~1.0 lbs (0.45 kg) loss
Weight Maintenance Current	2,450 kcal	0 kcal	Stable weight
Weight Gain (Bulking)	2,950 kcal	+500 kcal	~1.0 lbs (0.45 kg) gain

TDEE Activity Comparison

Compare your daily calorie burn estimates across different levels of physical exertion.

Activity Level	Multiplier	Estimated TDEE
Sedentary (Desk Job / No exercise)	1.20	1,920 kcal
Lightly Active (Exercise 1–3 days/wk)	1.375	2,200 kcal
Moderately Active (Exercise 3–5 days/wk)	1.55	2,480 kcal
Very Active (Exercise 6–7 days/wk)	1.725	2,760 kcal
Extra Active (Intense work / Athlete)	1.90	3,040 kcal

Ideal Body Weight Estimates

Calculated using standardized medical equations for a height of 5'9".

Formula	Ideal Weight	Formula Definition
Devine Equation (1974)	155.4 lbs (70.5 kg)	50.0kg + 2.3kg/inch over 5ft
Robinson Equation (1983)	153.9 lbs (69.8 kg)	52.0kg + 1.9kg/inch over 5ft
Miller Equation (1983)	157.0 lbs (71.2 kg)	56.2kg + 1.41kg/inch over 5ft
Hamwi Equation (1964)	160.1 lbs (72.6 kg)	48.0kg + 2.7kg/inch over 5ft
Healthy BMI Range (18.5–24.9)	125 – 169 lbs (56.8 – 76.5 kg)	Standard WHO body index

Maximum Muscular Potential (Lean Limit)

Estimates the natural skeletal weight limit of your body at different body fat percentages using Martin Berkhan's models.

Body Fat Percentage	Max Body Weight	Lean Mass Portion
5% – 6% Body Fat (Contest Shredded)	165.3 lbs (75.0 kg)	157.1 lbs (71.3 kg)
10% Body Fat (Very Lean / Visible Abs)	174.5 lbs (79.2 kg)	157.1 lbs (71.3 kg)
15% Body Fat (Athletic / Moderately Lean)	184.8 lbs (83.8 kg)	157.1 lbs (71.3 kg)

* Note: Martin Berkhan's formula is designed for male natural athletes. Women typically support about 12-15% less lean muscle mass for the same frame size. Calculations are adjusted accordingly.

What is Basal Metabolic Rate (BMR)?

Your basal metabolic rate (BMR) represents the absolute minimum amount of energy, measured in calories, that your body requires to maintain vital life-sustaining processes while at complete rest in a temperate environment and in a post-absorptive (fasted) state. Essentially, if you were to stay in bed all day and night without moving a single muscle, your body would still need to burn calories to support involuntary functions. These internal tasks include pumping blood through your circulatory system, filtering toxins via the kidneys and liver, cellular regeneration, maintaining body temperature, breathing, and conducting electrical impulses in the brain. A free, high-precision bmr calculator is a crucial starting point for anyone seeking to understand their metabolism, adjust daily energy needs, and plan target macronutrient splits on our Macro Calculator.

For a detailed comparison of resting baseline versus total daily energy needs, check out our expert guide: BMR vs. TDEE: What is the Difference and Why it Matters.

Understanding the Difference Between BMR and RMR

It is common to hear the terms "basal metabolic rate" and "resting metabolic rate" (RMR) used interchangeably, but they differ slightly in their clinical measurements. BMR must be measured in a highly controlled laboratory setting under strict guidelines: the individual must wake up after at least eight hours of sleep, have fasted for 12 hours, and lie completely still in a temperature-controlled room. In contrast, RMR is measured under less stringent guidelines—usually just requiring a short period of rest and a few hours of fasting. Because RMR factors in the small amounts of energy used for low-intensity movements or digestion, RMR values are typically 10% to 15% higher than BMR. To estimate either value, a resting metabolic rate calculator or BMR tool is used to establish a reliable benchmark.

How to Calculate BMR: Equations & Mathematical Formulas

Scientists have developed several mathematical equations to estimate basal metabolism. The most famous historic model is the harris-benedict equation, originally published in 1918 and updated in 1984. The bmr calculator formula for men harris-benedict calculates baseline energy expenditure by factoring in sex, age, weight, and height:

The Harris-Benedict Equations

Men Formula: BMR = 66.4730 + (13.7516 × weight in kg) + (5.0033 × height in cm) - (6.7550 × age in y)
Women Formula: BMR = 655.0955 + (9.5634 × weight in kg) + (1.8496 × height in cm) - (4.6756 × age in y)

The Mifflin-St Jeor & Katch-McArdle

Mifflin-St Jeor (Men): BMR = 10 × wt + 6.25 × ht - 5 × age + 5
Mifflin-St Jeor (Women): BMR = 10 × wt + 6.25 × ht - 5 × age - 161
Katch-McArdle: BMR = 370 + 21.6 × Lean Body Mass (kg)

Over time, researchers developed the Mifflin-St Jeor equation, which is now considered the gold standard for clinical estimates without body fat inputs because it is about 5% more accurate for modern lifestyles. For individuals who know their body composition, the Katch-McArdle equation is even more precise, as it calculates BMR purely based on lean body mass (LBM). You can calculate your body composition metrics directly using our Body Fat Calculator.

Formula	Primary Inputs	Best Use Case	Pros & Cons
Mifflin-St Jeor	Age, Sex, Weight, Height	General population & non-athletes	Highly reliable baseline; doesn't require body composition details.
Katch-McArdle	Lean Body Mass (LBM)	Athletes, bodybuilders, active lifters	Most accurate if body fat is known, as muscle is metabolically active.
Revised Harris-Benedict	Age, Sex, Weight, Height	Historical comparisons	Slightly overestimates resting calorie consumption in modern sedentary lives.

BMR Calculator for Men vs. Women: Body Composition Differences

Men and women exhibit distinct metabolic behaviors due to biological differences in body composition. On average, men possess a higher proportion of lean muscle tissue, whereas women naturally carry a higher percentage of essential body fat. Muscle is highly active tissue, meaning it burns significantly more calories at rest than fat tissue does. For this reason, a bmr calculator for men will yield a higher daily energy baseline than a bmr calculator for women of the exact same age, height, and weight. Understanding these gender-specific metabolic differences ensures that your dietary targets align with your biological reality. To see a simple visual reference of your weight status relative to height, you can use our BMI Calculator.

Using a BMR Calculator to Lose Weight Safely

If your primary goal is fat loss, utilizing a bmr calculator to lose weight is the most effective way to plan your nutrition. Your BMR represents the floor of your energy expenditure. To lose weight, you must first calculate your Total Daily Energy Expenditure (TDEE), which multiplies your BMR by an activity factor representing your daily movement. You can find this total daily budget using our TDEE Calculator. A safe weight loss plan involves creating a moderate caloric deficit below your TDEE (usually 300 to 500 calories less). However, you should generally avoid eating fewer calories than your BMR. Consuming less energy than your baseline BMR signals to your body that it is in a state of starvation, which can trigger metabolic slowdown, muscle wasting, and severe hormonal imbalances.

Why Choose MyHealthCalculate Over Competitors?

Unlike other online tools that overwhelm you with screen-blocking ads, popups, and slow load times, we provide a clean, free, and privacy-first Vercel-style health tracking suite. Here is how we compare to the top health calculators.

Feature / Metric	MyHealthCalculate	Calculator.net	TdeeCalculator.net	Healthline
Advertisements & Popups	Zero Ads (Clean Experience)	Heavy Ads & Scripts	Aggressive Ads & Cookies	Sticky Display Banners
Dark Mode Support	Full Native Support (Toggleable)	No (Light Mode Only)	No (Light Mode Only)	No (Light Mode Only)
Design Aesthetic	Premium Vercel-Style (Minimal)	Outdated 2000s Layout	Basic & Cluttered Layout	Standard News / Article Layout
Mobile Optimization	100% Touch-Friendly (Fluid Responsive)	Tiny fonts on Mobile viewport	Cluttered with ad overlays	Ad banners block content
Page Load Speed	Ultra-Fast Static (99+ Lighthouse)	Medium (Delayed by ad servers)	Medium (High script load)	Slow (Tracking script overhead)
JSON-LD Structured Schema	Fully Optimized Rich Snippet Schemas	Basic schemas only	Partial schemas	Informational Article schemas only

Frequently asked questions.

Answers to common queries regarding your basal metabolic rate and metabolic calculations.

What is BMR?

BMR stands for Basal Metabolic Rate. It represents the minimum number of calories your body needs to survive and perform vital biological functions—like breathing, blood circulation, and cellular repair—while at complete rest, without any activity or digestion.

What is my BMR?

Your individual BMR is determined by your biological characteristics, including your age, weight, height, gender, and muscle-to-fat ratio. You can estimate your BMR using an online bmr calculator which applies standard metabolic equations.

How to calculate BMR?

To calculate BMR, you can use metabolic equations like the Mifflin-St Jeor formula or the revised Harris-Benedict equation. The Mifflin-St Jeor formula is: BMR = 10 × weight (kg) + 6.25 × height (cm) - 5 × age (years) + s, where s is +5 for men and -161 for women.

What does BMR stand for?

BMR stands for Basal Metabolic Rate.

What does BMR mean?

BMR means the baseline level of energy (measured in calories) your body consumes in a 24-hour cycle just to stay alive at rest. It represents the energy expenditure of your internal organs without factoring in exercise, walking, or digesting food.

What is a BMR calculator?

A BMR calculator is an interactive online tool designed to estimate your Basal Metabolic Rate. By entering your gender, age, height, and weight, the tool calculates how many calories you burn at rest using validated biological formulas.

Is a BMR calculator accurate?

Yes, a BMR calculator is highly accurate for the majority of the population as a statistical estimate. However, because standard formulas do not factor in individual muscle mass directly (unless using Katch-McArdle), it may slightly underestimate BMR for muscular athletes and overestimate it for those with higher body fat percentages.

How accurate is a BMR calculator?

Most standard calculators are within 10% of your actual metabolic rate, which makes them excellent baselines for planning a diet. For absolute clinical accuracy, you would need indirect calorimetry, which measures your actual oxygen usage in a clinical environment.

What is the most accurate BMR calculator?

The most accurate BMR calculator estimates are typically obtained using clinically validated metabolic formulas like the Mifflin-St Jeor equation or, if body composition is known, the Katch-McArdle formula. Our tool applies these standard equations to provide an instant, high-precision resting metabolic rate estimate.

Which is best to track: BMR, BMI, or TDEE?

It depends on your goal. BMR calculates your baseline resting metabolism, TDEE measures your total daily calorie burn including activity, and BMI is a height-to-weight screening ratio. Keeping track of all three provides a comprehensive view of your health and metabolic rate.