BMR Calculator (Basal Metabolic Rate Calculator)
Calculate your Basal Metabolic Rate (BMR), maintenance calories, TDEE, calorie deficit targets and daily calorie needs instantly using our free BMR calculator.
Formula Used
Mifflin-St Jeor Equation
Men: BMR = (10 × weight kg) + (6.25 × height cm) − (5 × age) + 5
Women: BMR = (10 × weight kg) + (6.25 × height cm) − (5 × age) − 161
BMR Calculator – Calculate Your Basal Metabolic Rate Instantly
Our free BMR Calculator helps estimate how many calories your body burns each day while at complete rest. BMR stands for Basal Metabolic Rate, which represents the energy required to maintain essential bodily functions such as breathing, circulation, digestion and cell production. Whether your goal is weight loss, weight gain or simply maintaining your current weight, understanding your BMR is one of the most important steps in nutrition planning.
This basal metabolic rate calculator uses the scientifically recognized Mifflin-St Jeor formula to estimate calorie requirements based on age, gender, height and weight. After calculating your BMR, the tool also estimates your maintenance calories, helping answer common questions such as how many calories do I need per day and how many calories should I consume a day.
How To Use The BMR Calculator
- Select your gender.
- Enter your age.
- Enter your height and weight.
- Choose your activity level.
- Click Calculate.
- View your BMR, maintenance calories and calorie targets for weight loss or weight gain.
BMR Formula
Men: BMR = (10 × weight kg) + (6.25 × height cm) − (5 × age) + 5
Women: BMR = (10 × weight kg) + (6.25 × height cm) − (5 × age) − 161
BMR vs Maintenance Calories
Many people confuse BMR with maintenance calories. Your BMR represents calories burned at rest, while maintenance calories include exercise, walking, work activity and daily movement. This is why many users searching for a maintenance calorie calculator or TDEE calculator can benefit from using a BMR calculator first.
| Metric | Meaning |
|---|---|
| BMR | Calories burned at complete rest. |
| TDEE | Total calories burned including activity. |
| Calorie Deficit | Calories below maintenance for weight loss. |
| Calorie Surplus | Calories above maintenance for weight gain. |
How Many Calories Do I Need Per Day?
One of the most common nutrition questions is how many calories do I need per day. The answer depends on factors such as age, sex, height, weight, body composition and activity level. A person who exercises regularly typically requires more calories than someone with a sedentary lifestyle. This calculator estimates your BMR and then applies an activity multiplier to estimate your maintenance calories, sometimes referred to as TDEE or Total Daily Energy Expenditure.
If you have searched for phrases such as how many calories should I consume a day, how many calories should I intake per dayor how many calories do I need to eat a day, this calculator provides a practical starting point. While no calculator can perfectly predict individual calorie needs, the estimates are useful for setting realistic nutrition and fitness goals.
Using Your Results For Weight Loss Or Weight Gain
After calculating your maintenance calories, you can adjust your calorie intake depending on your goal. For gradual weight loss, many people choose a modest calorie deficit. For muscle gain or healthy weight gain, a calorie surplus may be appropriate. This is why users often search for a calorie deficit calculator, calorie calculator to lose weightor maintenance calorie calculator.
| Goal | Suggested Adjustment |
|---|---|
| Maintain Weight | Eat at maintenance calories |
| Slow Weight Loss | Around 250 calories below maintenance |
| Weight Loss | Around 500 calories below maintenance |
| Muscle Gain | Around 250 calories above maintenance |
Why Use This BMR Calculator?
Unlike many calculators that require account creation, subscriptions or app downloads, this tool works directly in your browser. The calculations happen instantly on your device, making it fast, private and easy to use. Whether you are looking for a metabolic rate calculator, basal metabolism calculator or calculator for basal metabolic rate, this tool provides the information most people need in seconds.
Because the calculator supports both metric and imperial units, it can be used by visitors worldwide. The results are designed to help estimate calorie requirements rather than replace professional medical advice, but they provide a reliable foundation for fitness and nutrition planning.
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Frequently Asked Questions
Is this BMR calculator free?
Yes. The calculator is completely free to use with no subscriptions, registrations or hidden charges.
Does this calculator run in my browser?
Yes. All calculations happen on the client side in your browser. Your inputs are not sent to a server for calculation.
Is the BMR formula accurate?
The calculator uses the Mifflin-St Jeor equation, one of the most widely accepted formulas for estimating basal metabolic rate.
What is the difference between BMR and TDEE?
BMR measures calories burned at rest, while TDEE includes exercise, work activity and daily movement.
Can I use this calculator for weight loss?
Yes. The calculator provides maintenance calories and estimated calorie targets commonly used for weight loss planning.
Do I need to create an account?
No. The calculator is available instantly and does not require registration or login.