Basal Metabolic Rate Calculator

Estimate your basal metabolic rate using the Mifflin-St Jeor equation based on sex, age, weight, and height. BMR is the number of calories your body burns at rest over 24 hours.

Sex

Age (years)

Weight (kg)

Height (cm)

BMR:

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What the Basal Metabolic Rate Calculator does

The Basal Metabolic Rate Calculator helps you estimate your BMR, which is the number of calories your body burns at rest over a 24-hour period. This is the energy your body needs to keep essential functions running, such as breathing, circulating blood, regulating body temperature, and supporting organ function.

This tool uses the Mifflin-St Jeor equation, one of the most commonly used formulas for estimating basal metabolic rate. It takes into account four key inputs:

Sex
Age in years
Weight in kilograms
Height in centimeters

Because BMR is a starting point for understanding calorie needs, this calculator is useful for people who want to manage weight, plan meals, estimate daily energy needs, or simply learn more about how their body uses energy. It is important to remember that BMR is not the same as total daily calorie expenditure. It only reflects calories burned at rest, not calories burned through movement, exercise, or digestion.

In other words, the Basal Metabolic Rate Calculator gives you a practical estimate of your resting calorie needs, which can be a valuable baseline for fitness and nutrition planning.

How to use the Basal Metabolic Rate Calculator

Using the Basal Metabolic Rate Calculator is quick and straightforward. The tool is designed to give you an estimate in just a few steps.

Select your sex from the available options. This matters because the formula uses a sex-based adjustment.
Enter your age in years.
Provide your weight in kilograms.
Enter your height in centimeters.
Click the calculate button to see your estimated BMR.

The result is usually shown as a calorie value, representing the estimated number of calories your body burns each day while at rest. If you are using the result for diet or fitness planning, remember that BMR is only one part of the calorie equation. Your activity level will also affect how many calories you need per day.

To get the most accurate estimate, make sure your measurements are as precise as possible. For example, use a reliable scale for weight and a proper measuring method for height. Even small differences can slightly affect the result.

How the Basal Metabolic Rate Calculator formula works

This calculator uses the Mifflin-St Jeor equation, which is widely regarded as one of the better formulas for estimating BMR in adults. The general formula is:

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

Here is what each part means:

10 × weight_kg: Heavier bodies usually require more energy to maintain basic functions, so weight increases BMR.
6.25 × height_cm: Taller people generally have more body mass and surface area, which can raise resting energy needs.
– 5 × age_years: BMR tends to decline with age, so the formula subtracts calories as age increases.
sex: A sex-based constant is added to account for average differences in body composition and metabolism.

The sex constant is typically different for males and females in the Mifflin-St Jeor formula. In many versions, the adjustment is:

+5 for males
-161 for females

This means that two people with the same height, weight, and age may still have different BMR values if their sex differs in the calculator model.

For example, if a person weighs 70 kg, is 175 cm tall, and is 30 years old, the formula would combine those values with the sex-based constant to estimate daily calorie burn at rest. The final number is the BMR, which appears as the result label in the calculator.

Although the formula is very useful, it is still an estimate. Real-world metabolism can vary due to genetics, muscle mass, body composition, hormones, and health conditions. Still, the Mifflin-St Jeor equation is considered a strong starting point for most adults.

Use cases for the Basal Metabolic Rate Calculator

The Basal Metabolic Rate Calculator can be helpful in a variety of health, fitness, and nutrition situations. Here are some of the most common use cases:

Weight management: Knowing your BMR helps you estimate how many calories you need to maintain, lose, or gain weight.
Meal planning: Diet planners and individuals can use BMR as a baseline for setting calorie goals.
Fitness tracking: Athletes and recreational exercisers can compare resting calorie needs with activity-based calorie burn.
Health awareness: Understanding BMR can help you learn more about your body’s energy demands.
Nutrition counseling: Dietitians and coaches may use BMR as part of a broader calorie and macronutrient strategy.

If your goal is to lose weight, a BMR estimate can help you create a calorie deficit safely and realistically. If your goal is muscle gain, it can help you understand the baseline calories needed before adding exercise and growth-related energy demands. For people trying to maintain weight, the calculator gives an important reference point for daily intake planning.

The tool is also useful for anyone who wants to avoid guessing. Rather than relying on rough estimates, you can use the calculator to get a personalized number based on your own body measurements and age.

Other factors to consider when calculating BMR

Even though the Basal Metabolic Rate Calculator gives a useful estimate, there are several important factors that can influence real metabolic rate and overall calorie needs. BMR is not fixed forever, and it can change over time.

Consider these additional factors:

Body composition: Muscle tissue burns more calories at rest than fat tissue, so two people with the same weight may have different BMR values.
Genetics: Some people naturally have faster or slower metabolism due to inherited traits.
Hormonal balance: Thyroid function and other hormones can affect energy expenditure.
Health conditions: Certain medical conditions may increase or decrease metabolic rate.
Medications: Some medications can influence appetite, energy use, or metabolism.
Age-related changes: Metabolism often slows as people get older, especially if muscle mass decreases.
Activity level: While not part of BMR itself, daily movement can dramatically change total calorie needs.

For the best interpretation of your result, treat BMR as a foundation rather than a final answer. If you are calculating calories for a specific health goal, you may want to combine your BMR with an activity multiplier to estimate total daily energy expenditure (TDEE).

Also, if you are dealing with a medical issue, rapid weight changes, or a history of eating disorders, it is wise to speak with a qualified healthcare professional before making major calorie adjustments. A calculator can guide you, but it cannot replace personalized medical advice.

FAQ

What is BMR?

BMR stands for basal metabolic rate. It is the number of calories your body burns at rest to support essential life functions like breathing, circulation, and cell maintenance.

Is the Basal Metabolic Rate Calculator accurate?

The calculator provides a good estimate, but not a perfect measurement. It uses a standard formula that works well for many adults, though actual metabolism can vary based on muscle mass, hormones, genetics, and health status.

How is BMR different from daily calorie needs?

BMR only measures calories burned at rest. Daily calorie needs are usually higher because they also include physical activity, exercise, and the energy used to digest food. That broader total is often called TDEE.

Can I use this calculator for weight loss planning?

Yes. The Basal Metabolic Rate Calculator is a helpful first step for weight loss planning because it gives you a baseline calorie estimate. From there, you can determine a reasonable calorie deficit based on your activity level and goals.

Why does sex affect the result?

Sex affects the result because the Mifflin-St Jeor equation includes a sex-based adjustment. This reflects average differences in body composition and energy expenditure, which can influence resting calorie burn.

In summary, the Basal Metabolic Rate Calculator is a simple but powerful tool for estimating how many calories your body uses at rest. Whether you are tracking nutrition, managing weight, or learning more about your metabolism, it gives you a reliable starting point for smarter health decisions.

Support this tool

Buy us a coffee

If this Basal Metabolic Rate 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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