BMR Calculator

Estimate your basal metabolic rate (BMR), the number of calories your body needs each day at complete rest, using the Mifflin-St Jeor equation with adjustments for sex, age, weight, and height.

Sex

Age (years)

Weight (kg)

Height (cm)

BMR:

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What the BMR Calculator does

The BMR Calculator helps you estimate your basal metabolic rate (BMR), which is the number of calories your body needs each day to perform basic functions while at complete rest. These essential functions include breathing, circulating blood, regulating body temperature, and supporting organ activity. In other words, BMR is the amount of energy your body would use if you stayed in bed all day and did nothing else.

This bmr calculator is designed to give you a quick and practical estimate based on the Mifflin-St Jeor equation, one of the most widely used formulas for estimating resting energy needs. It adjusts the result using your:

Sex
Age
Weight in kilograms
Height in centimeters

The output is labeled BMR, making it easy to understand your baseline calorie requirement before activity levels are added. This is useful for anyone who wants to estimate daily calorie needs, plan weight goals, or better understand how their body uses energy.

Because the result reflects resting energy expenditure, it does not include calories burned through exercise, walking, work, or other daily movement. That means BMR is only one part of your total energy needs, but it is an important foundation for building a nutrition plan.

How to use the BMR Calculator

Using the BMR Calculator is simple and only takes a few steps. Enter the requested personal details, and the calculator will estimate your basal metabolic rate instantly.

Select your sex from the available options.
Enter your age in years.
Input your weight in kilograms.
Enter your height in centimeters.
Click calculate to view your BMR result.

To get the most accurate estimate, make sure the information you enter is correct. Even small changes in age, height, or weight can slightly change the result. If you do not know your measurements in metric units, convert them first for the best accuracy.

A good way to interpret the result is to think of BMR as the starting point for your daily calorie needs. For example, if your BMR is 1,500 calories, your real daily requirement will usually be higher once normal movement and exercise are included. This is why BMR is often used alongside activity level to estimate total daily energy expenditure.

When using this bmr calculator, remember that the estimate is intended for general informational purposes. It can guide decisions, but it is not a medical diagnosis or a personalized nutrition prescription.

How the BMR Calculator formula works

This BMR Calculator uses the Mifflin-St Jeor equation, which is commonly considered one of the better formulas for estimating basal metabolic rate in adults. The calculation is based on body size and age, with a sex-based adjustment included to reflect average metabolic differences.

The formula used is:

(10 * weight_kg) + (6.25 * height_cm) – (5 * age_years) + sex

Here is what each part means:

10 * weight_kg: adds calories based on body mass
6.25 * height_cm: adds calories based on height
– 5 * age_years: subtracts calories as age increases
sex: provides a constant adjustment depending on male or female input

The sex adjustment in the equation is typically:

+5 for men
-161 for women

That means two people with the same age, weight, and height may receive different BMR results because the formula accounts for average physiological differences. This is one reason the bmr calculator is more precise than a one-size-fits-all calorie estimate.

Example: if a person weighs 70 kg, is 175 cm tall, and is 30 years old, the formula would calculate a baseline BMR using those numbers plus the sex-specific constant. The result tells you how many calories the body would likely burn per day at rest.

Although the formula is widely used, it is still an estimate. Real-world metabolism can be influenced by muscle mass, hormonal health, body composition, genetics, and other factors that are not fully captured in the equation.

Use cases for the BMR Calculator

The BMR Calculator can be helpful in many everyday situations. Whether you are trying to manage your weight, improve your diet, or simply learn more about your body, this tool provides a useful starting point.

Weight loss planning: Use BMR as the baseline when creating a calorie deficit.
Weight gain goals: Estimate your resting needs before adding extra calories for a surplus.
Maintenance eating: Understand how many calories your body needs before activity is included.
Fitness tracking: Compare BMR with total calorie burn to better plan workouts and recovery.
Nutrition education: Learn how body size, age, and sex influence energy needs.
Health monitoring: Gain insight into how metabolic needs may change over time.

For people who track calories, the bmr calculator is often the first step in setting a daily target. Once BMR is known, activity multipliers can be used to estimate total daily calorie needs. This helps create a more realistic diet plan than guessing from general charts alone.

It can also be useful for athletes, older adults, and people recovering from changes in body weight. Knowing your approximate resting calorie needs may support smarter decisions about meal timing, portion size, and energy intake.

Other factors to consider when calculating BMR

While the BMR Calculator offers a reliable estimate, there are several other factors that can affect your true metabolic rate. The formula is based on averages, so it may not perfectly match every individual.

Muscle mass: People with more lean mass often burn more calories at rest.
Body composition: Fat mass and lean tissue affect energy use differently.
Age changes: Metabolism may slow gradually as you get older.
Hormones: Thyroid function and other hormonal factors can influence metabolic rate.
Illness or recovery: Medical conditions and healing can raise or lower calorie needs.
Pregnancy and breastfeeding: Energy needs are typically higher during these periods.

It is also important to remember that BMR is not the same as total daily energy expenditure (TDEE). TDEE includes all calories burned through movement, exercise, digestion, and daily activities. If your goal is to estimate your full daily calorie requirement, BMR should be combined with an activity factor.

If you want a more personalized result, consider using the BMR estimate as a starting point and adjusting based on your real-world progress. For example, if your weight stays stable at a certain calorie intake, that intake may be close to your maintenance level even if it differs from the calculator’s prediction.

In short, this bmr calculator is best used as a practical guide rather than an exact measurement. It can help you make informed choices, but your body’s real energy needs may vary over time.

FAQ

What is BMR?

BMR, or basal metabolic rate, is the number of calories your body uses each day at complete rest. It covers essential functions like breathing, circulation, and maintaining organ activity.

Is BMR the same as daily calorie needs?

No. BMR is only your resting calorie requirement. Your actual daily calorie needs are usually higher because they also include physical activity, exercise, and digestion.

How accurate is the BMR Calculator?

The BMR Calculator provides a strong estimate based on the Mifflin-St Jeor equation, but it is still an estimate. Factors like muscle mass, hormones, and health conditions can make your real metabolic rate different.

Why does sex affect BMR?

Sex affects the formula because average body composition and metabolic characteristics can differ between men and women. The calculator uses a sex-based constant to improve the estimate.

Can I use this BMR Calculator for weight loss?

Yes. Many people use a bmr calculator as the first step in weight loss planning. After finding BMR, you can estimate your total daily calories and then create a sensible calorie deficit if needed.

Whether you are managing weight, planning meals, or simply curious about your metabolism, the BMR Calculator is a useful and easy-to-use tool. It provides a clear starting point for understanding your body’s basic energy needs and how they fit into your larger health and fitness goals.

Support this tool

Buy us a coffee

If this BMR Calculator helped you, support the site with a small donation. It keeps the tools on the site free and supports ongoing improvements.

Buy us a coffee

Secure donation via Gumroad

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Calorie Calculator for Cutting Estimate daily calorie intake for a cutting phase using body weight, height, age, sex, activity level, and desired calorie deficit. Try it → Calorie Calculator for Cutting

Calorie Deficit Calculator Estimate your daily calorie target for weight loss using age, sex, weight, height, activity level, and desired calorie deficit. Try it → Calorie Deficit Calculator

Cutting Calorie Calculator Estimate daily cutting calories by calculating maintenance calories from body weight, height, age, sex, and activity level, then applying a calorie deficit for fat loss. Try it → Cutting Calorie Calculator

Calorie Surplus Calculator Estimate your daily calorie target for weight gain by adding a calorie surplus to your maintenance calories based on body weight, activity level, and desired weekly weight gain. Try it → Calorie Surplus Calculator

Clean Bulk Calorie Calculator Estimate daily calories for a clean bulk using body weight, height, age, sex, activity level, and desired lean gain rate. Try it → Clean Bulk Calorie Calculator

Lean Bulk Calorie Calculator Estimate daily calories for a lean bulk using body weight, height, age, sex, activity level, and a small calorie surplus on top of maintenance needs. Try it → Lean Bulk Calorie Calculator

Bulking Calorie Calculator Estimate daily calories for a bulking phase using body weight, height, age, sex, activity level, and desired calorie surplus. Try it → Bulking Calorie Calculator

Calorie Calculator for Muscle Gain Estimate daily calorie needs for muscle gain using body weight, height, age, sex, activity level, and a calorie surplus. Try it → Calorie Calculator for Muscle Gain

Calorie Calculator Estimate daily calorie needs using age, sex, weight, height, and activity level based on the Mifflin-St Jeor equation. Try it → Calorie Calculator

Bodybuilding Calorie Calculator Estimate daily calories for bodybuilding based on body weight, height, age, sex, activity level, and goal. Try it → Bodybuilding Calorie Calculator

Total Daily Energy Expenditure Calculator Estimate total daily energy expenditure (TDEE) using the Mifflin-St Jeor equation for basal metabolic rate and an activity multiplier. Try it → Total Daily Energy Expenditure Calculator

TDEE Calculator Estimate total daily energy expenditure using the Mifflin-St Jeor equation for BMR and an activity multiplier. Try it → TDEE Calculator

Maintenance Calories Calculator Estimate your daily maintenance calories using weight, height, age, sex, and activity level based on the Mifflin-St Jeor equation multiplied by an activity factor. Try it → Maintenance Calories Calculator

Maintenance Calorie Calculator Estimate your daily maintenance calories using age, sex, weight, height, and activity level based on the Mifflin-St Jeor equation with an activity multiplier. Try it → Maintenance Calorie Calculator

Calorie Needs Calculator Estimate daily calorie needs using age, sex, weight, height, and activity level based on the Mifflin-St Jeor equation and an activity multiplier. Try it → Calorie Needs Calculator

Calorie Intake Calculator Estimate daily calorie intake based on age, sex, weight, height, and activity level using a basal metabolic rate calculation adjusted for lifestyle. Try it → Calorie Intake Calculator

Daily Calorie Calculator Estimate daily calorie needs using age, sex, weight, height, and activity level. Try it → Daily Calorie Calculator

Body Measurement Progress Calculator Calculate the percentage change in a body measurement from a starting value to a current value, with an optional target measurement to estimate progress toward your goal. Try it → Body Measurement Progress Calculator

Weight Loss Percentage Calculator Calculate the percentage of body weight lost based on starting weight and current weight. Try it → Weight Loss Percentage Calculator

Calf Size Calculator Estimate calf circumference based on height, weight, age, and sex using a practical body-size formula. Try it → Calf Size Calculator

Chest Size Calculator Estimate chest circumference based on body measurements and body composition factors. Try it → Chest Size Calculator

Arm Size Calculator Estimate upper arm circumference based on sex, height, weight, age, and training level. Try it → Arm Size Calculator

Body Proportion Calculator Estimate common body proportion ratios using height, shoulder width, waist circumference, hip circumference, and inseam length. Try it → Body Proportion Calculator

Golden Ratio Body Calculator Estimate how closely key body proportions align with the golden ratio using shoulder-to-waist, waist-to-hip, and leg-to-height relationships. Try it → Golden Ratio Body Calculator

Shoulder to Waist Ratio Calculator Calculate the shoulder-to-waist ratio using shoulder circumference and waist circumference measurements. Try it → Shoulder to Waist Ratio Calculator

Waist to Hip Ratio Calculator Calculate your waist-to-hip ratio (WHR) using waist and hip measurements. Try it → Waist to Hip Ratio Calculator

Waist to Height Ratio Calculator Calculate your waist-to-height ratio by dividing waist circumference by height. Try it → Waist to Height Ratio Calculator

Body Fat Weight Loss Calculator Estimate how much body weight you need to lose to reach a target body fat percentage while preserving lean body mass. Try it → Body Fat Weight Loss Calculator

Ideal Weight Calculator Estimate an ideal body weight using height, gender, frame size, and formula method. Try it → Ideal Weight Calculator

Target Weight at Body Fat Calculator Estimate your target body weight based on your current weight, current body fat percentage, desired body fat percentage, and expected lean mass change. Try it → Target Weight at Body Fat Calculator

Target Weight Calculator Estimate a target body weight based on height, sex, body frame, and desired BMI using a practical health-oriented formula. Try it → Target Weight Calculator

Target Body Fat Calculator Estimate your target body weight needed to reach a desired body fat percentage based on your current weight and current body fat. Try it → Target Body Fat Calculator

Natural Muscle Potential Calculator Estimate a realistic natural muscular bodyweight potential based on height, wrist size, ankle size, and body fat percentage using a frame-size adjusted formula. Try it → Natural Muscle Potential Calculator

Maximum Muscle Potential Calculator Estimate your potential lean body mass and maximum muscular body weight based on height, wrist size, ankle size, and body fat percentage using a frame-size-adjusted formula inspired by classic natural bodybuilding models. Try it → Maximum Muscle Potential Calculator

Maximum Muscular Potential Calculator Estimate maximum muscular bodyweight potential at a lean condition using wrist size, ankle size, height, and sex. Try it → Maximum Muscular Potential Calculator

Bodybuilding Ideal Weight Calculator Estimate an ideal bodybuilding body weight based on height, wrist size, body fat percentage, and sex. Try it → Bodybuilding Ideal Weight Calculator

Ideal Body Weight Calculator Estimate ideal body weight using common clinical formulas based on height, sex, and formula method. Try it → Ideal Body Weight Calculator

Body Recomposition Calculator Estimate your daily calorie target for body recomposition by combining lean body mass, activity level, training experience, and goal aggressiveness into a practical maintenance-adjusted intake. Try it → Body Recomposition Calculator

Lean Mass Calculator Estimate lean body mass using body weight and body fat percentage, with support for either kilograms or pounds. Try it → Lean Mass Calculator

Normalized FFMI Calculator Estimate normalized Fat-Free Mass Index (FFMI) by adjusting FFMI to a reference height of 1.80 m. Try it → Normalized FFMI Calculator

Fat Free Mass Index Calculator Calculate Fat Free Mass Index (FFMI) using body weight, height, and body fat percentage. Try it → Fat Free Mass Index Calculator

FFMI Calculator Calculate Fat-Free Mass Index (FFMI) using weight, height, and body fat percentage. Try it → FFMI Calculator

Muscle Mass Percentage Calculator Estimate muscle mass percentage by dividing total skeletal muscle mass by total body weight and converting the result to a percentage. Try it → Muscle Mass Percentage Calculator

Muscle Mass Calculator Estimate skeletal muscle mass using body weight, height, age, sex, and body fat percentage. Try it → Muscle Mass Calculator

Fat Mass Calculator Estimate total fat mass in the body using body weight and body fat percentage. Try it → Fat Mass Calculator

Seven Site Skinfold Calculator Estimate body density and body fat percentage from seven skinfold measurements using the Jackson-Pollock 7-site method and Siri equation. Try it → Seven Site Skinfold Calculator

BMI Calculator Calculate Body Mass Index (BMI) using weight and height, with support for metric and imperial units. Try it → BMI Calculator

Three Site Skinfold Calculator Estimate body fat percentage using the Jackson-Pollock 3-site skinfold method with age and sex-specific formulas. Try it → Three Site Skinfold Calculator

Skinfold Body Fat Calculator Estimate body fat percentage using the 3-site Jackson-Pollock skinfold method with age and sex. Try it → Skinfold Body Fat Calculator

Navy Body Fat Calculator Estimate body fat percentage using the U.S. Try it → Navy Body Fat Calculator

Army Body Fat Calculator Estimate body fat percentage using the U.S. Try it → Army Body Fat Calculator

Body Fat Percentage Calculator Estimate body fat percentage using the U.S. Try it → Body Fat Percentage Calculator

Body Fat Calculator Estimate body fat percentage using the U.S. Try it → Body Fat Calculator

Body Mass Index Calculator Calculate body mass index (BMI) using weight and height, with support for metric and imperial units. Try it → Body Mass Index Calculator

Powerlifting Weight Class Calculator Estimate the applicable powerlifting weight class based on body weight, federation style, division, and weigh-in policy. Try it → Powerlifting Weight Class Calculator

Wilks Score Calculator Calculate a Wilks score from bodyweight, total lifted, sex, and unit system using the classic Wilks coefficient formula. Try it → Wilks Score Calculator

Bench Squat Deadlift Total Calculator Calculate your powerlifting total by adding your best bench press, squat, and deadlift lifts, with an optional unit conversion factor for kilograms or pounds. Try it → Bench Squat Deadlift Total Calculator

Big Three Total Calculator Calculate your Big Three total by adding the degree positions of your Sun, Moon, and Rising signs. Try it → Big Three Total Calculator

Powerlifting Total Calculator Calculate your powerlifting total by adding your best squat, bench press, and deadlift attempts, with optional unit conversion from pounds to kilograms. Try it → Powerlifting Total Calculator

IPF Points Calculator Calculate IPF GL points for a powerlifting total based on sex, equipment, bodyweight, and total lifted. Try it → IPF Points Calculator

DOTS Score Calculator Calculate a DOTS powerlifting score using lifter bodyweight, total lifted, sex, and equipment category. Try it → DOTS Score Calculator

DOTS Calculator Estimate the total cost of a DOTS package based on the number of doses, treatment duration, supervision level, and medication cost per dose. Try it → DOTS Calculator

Weighted Dip Calculator Estimate the total weighted dip training load by combining added weight, bodyweight contribution, reps, and sets. Try it → Weighted Dip Calculator

Overhead Press Max Calculator Estimate your one-rep max for the overhead press using the weight lifted, repetitions completed, lifting unit, and training experience. Try it → Overhead Press Max Calculator

Weighted Pull Up Calculator Calculate total system weight and relative pulling load for weighted pull-ups using body weight, added weight, reps, and unit selection. Try it → Weighted Pull Up Calculator

Pull Up One Rep Max Calculator Estimate your weighted pull-up one rep max using bodyweight, added weight, and the maximum reps completed. Try it → Pull Up One Rep Max Calculator

Barbell Row Max Calculator Estimate your one-rep max for the barbell row using the weight lifted, repetitions completed, training experience, and exercise form strictness. Try it → Barbell Row Max Calculator

Hip Thrust Max Calculator Estimate your one-rep max for the hip thrust using the weight lifted, repetitions completed, bodyweight contribution, and training experience. Try it → Hip Thrust Max Calculator

Leg Press Max Calculator Estimate your one-rep max (1RM) on the leg press using the weight lifted, repetitions completed, leg press machine type, training experience, and effort level. Try it → Leg Press Max Calculator

Military Press Max Calculator Estimate your one-rep max for the military press using the weight lifted, repetitions completed, lift style, training experience, and fatigue level. Try it → Military Press Max Calculator

Shoulder Press Max Calculator Estimate your one-rep max for the shoulder press using the weight lifted, reps completed, training experience, and movement variation. Try it → Shoulder Press Max Calculator

Overhead Press 1RM Calculator Estimate your one-rep max for the overhead press using the weight lifted and repetitions completed. Try it → Overhead Press 1RM Calculator

Romanian Deadlift Max Calculator Estimate your one-rep max for the Romanian deadlift using the weight lifted, reps completed, lift tempo quality, and training experience. Try it → Romanian Deadlift Max Calculator

Deadlift Max Calculator Estimate your one-rep max deadlift using the weight lifted, reps completed, body weight, lifting experience, and deadlift style. Try it → Deadlift Max Calculator

Deadlift Volume Calculator Calculate total deadlift training volume based on weight lifted, reps per set, number of sets, and workout intensity. Try it → Deadlift Volume Calculator

Deadlift Bodyweight Ratio Calculator Calculate your deadlift-to-bodyweight ratio using your body weight, deadlift weight, unit system, lift type, and training experience. Try it → Deadlift Bodyweight Ratio Calculator

Deadlift Strength Calculator Estimate your one-rep max deadlift using weight lifted, reps performed, body weight, and training experience, with a small experience adjustment and bodyweight normalization factor. Try it → Deadlift Strength Calculator

Deadlift Training Max Calculator Estimate your deadlift training max using a recent lifted weight, reps completed, and a chosen training max percentage. Try it → Deadlift Training Max Calculator

Deadlift Percentage Calculator Calculate a deadlift training weight based on your one-rep max, chosen training percentage, reps, and training experience. Try it → Deadlift Percentage Calculator

Deadlift 1RM Calculator Estimate your one-rep max for the deadlift using lifted weight, completed reps, bodyweight, experience level, and training style. Try it → Deadlift 1RM Calculator

Deadlift One Rep Max Calculator Estimate your deadlift one-rep max based on the weight lifted, repetitions completed, training experience, and lift style. Try it → Deadlift One Rep Max Calculator

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