BMR & TDEE Calculator – Daily Calories, Macros & Energy Needs

Understanding how many calories your body needs each day is an important step toward managing your weight, improving your fitness, and building healthier eating habits. Our free BMR and TDEE Calculator helps you estimate your resting energy requirements, daily calorie expenditure, and personalized calorie targets based on your age, biological sex, height, weight, and activity level. Whether your goal is to maintain your current weight, lose body fat, or gain muscle, this calculator provides useful information to help you plan your nutrition.

The calculator also includes popular BMR formulas, activity-level comparisons, protein targets, fat and carbohydrate estimates, and meal-level macro breakdowns. You can switch between metric and imperial measurements, adjust your weekly weight-change goal, save different scenarios, and export your results. Everything is calculated directly in your browser, making it convenient to explore different calorie targets without creating an account.

What Is a BMR and TDEE Calculator?

A BMR and TDEE Calculator is a fitness and nutrition tool that estimates how much energy your body uses at rest and throughout an average day. It combines two important measurements: Basal Metabolic Rate (BMR) and Total Daily Energy Expenditure (TDEE).

What Is BMR (Basal Metabolic Rate)?

Basal Metabolic Rate, commonly called BMR, is the estimated amount of energy your body requires to maintain essential functions while resting. These functions include breathing, blood circulation, temperature regulation, and normal organ activity.

Your BMR represents a large part of your daily energy requirements. However, it does not include all the calories you burn through walking, exercise, household activities, or digestion.

For example, if your estimated BMR is 1,650 calories per day, this means your body requires approximately that amount of energy to support basic resting functions under the conditions assumed by the formula. It does not mean that 1,650 calories is automatically the correct amount to eat every day.

What Is TDEE (Total Daily Energy Expenditure)?

Total Daily Energy Expenditure, or TDEE, estimates the total number of calories your body burns throughout an average day. It includes your resting energy requirements and additional energy used for physical activities.

The calculator estimates TDEE by multiplying BMR by an activity multiplier.

TDEE = BMR × Activity Multiplier

For example, if your BMR is 1,600 calories and your selected activity multiplier is 1.55, your estimated TDEE would be:

1,600 × 1.55 = 2,480 calories per day

This means approximately 2,480 calories per day may maintain your current weight under the assumptions of the selected activity level. Actual energy needs can differ between individuals.

Why Are BMR and TDEE Both Important?

BMR and TDEE answer different questions. BMR estimates the energy needed for basic resting functions, while TDEE estimates your overall daily energy expenditure.

• BMR: Helps estimate your resting energy requirements.
• TDEE: Helps estimate your daily maintenance calories.
• Calorie deficit: Helps create a starting point for a weight-loss nutrition plan.
• Calorie surplus: Helps estimate additional energy for a weight-gain or muscle-building plan.
• Macro targets: Help organize daily protein, fat, and carbohydrate intake.

Key Features of Our BMR and TDEE Calculator

Our online BMR and TDEE Calculator combines several useful nutrition calculations in one place. Instead of using separate tools for resting calories, maintenance calories, and macronutrients, you can explore these estimates through a single interface.

1. Multiple BMR Calculation Formulas

Different scientific equations estimate resting energy requirements using different measurements. This calculator includes three commonly used formulas:

• Mifflin-St Jeor: Uses weight, height, age, and biological sex. It is a widely used equation for estimating resting energy expenditure in adults.
• Revised Harris-Benedict: Uses similar personal measurements and provides another established estimate of basal energy requirements.
• Katch-McArdle: Estimates resting energy expenditure using lean body mass, which is calculated from body weight and body fat percentage.

You can select a formula and compare how your estimated calorie requirements change. Remember that each equation is an estimation method rather than a direct measurement of metabolism.

2. Metric and Imperial Units

The calculator supports two measurement systems to make entering your details easier.

• Metric: Enter body weight in kilograms and height in centimeters.
• Imperial: Enter body weight in pounds and height in feet and inches.

The calculator converts imperial measurements into metric values internally before performing the calculations. This allows you to use the same calculation formulas regardless of your preferred measurement system.

3. Personalized TDEE Calculation

Your activity level has an important effect on estimated daily energy expenditure. The calculator offers five activity categories:

• Sedentary (1.20): Mostly sitting with little structured exercise.
• Lightly Active (1.375): Light exercise or physical activity on a limited number of days each week.
• Moderately Active (1.55): Regular moderate exercise or a reasonably active routine.
• Very Active (1.725): Frequent demanding exercise or a physically active lifestyle.
• Athlete (1.90): Very high activity levels involving substantial training or physical work.

Choose the category that best represents your normal routine rather than selecting a higher level simply because you exercise occasionally. Activity multipliers are approximate and may not reflect every person\'s actual energy expenditure.

4. Flexible Weight Goals

You can calculate daily calorie targets for different weight-management goals.

• Maintain Weight: Uses your estimated TDEE as the daily calorie target.
• Fat Loss: Estimates a calorie deficit based on your selected weekly weight-change rate.
• Lean Gain: Estimates a calorie surplus based on your selected weekly weight-change rate.
• Custom Calories: Allows you to enter a personal daily calorie target.

The weekly change setting ranges from zero to one kilogram per week. The calculator uses an approximate energy conversion of 7,700 calories per kilogram to estimate the daily adjustment. Real-world weight changes are not perfectly linear, so these figures should be treated as planning estimates rather than guaranteed outcomes.

5. Protein, Fat, and Carbohydrate Calculator

Knowing your daily calorie target is only one part of nutrition planning. Macronutrients provide another way to organize your food intake.

The calculator estimates three main macronutrients:

• Protein: Calculated using your body weight and selected protein grams-per-kilogram factor.
• Fat: Estimated using the percentage of daily goal calories allocated to fat.
• Carbohydrates: Calculated from the remaining calorie allowance after protein and fat.

You can also select how many meals you normally eat each day. The calculator then divides the estimated macro amounts into approximate per-meal targets.

6. Activity-Level Comparison Chart

The activity comparison chart displays estimated maintenance calories across all five activity levels using your calculated BMR. It helps you understand how your estimated daily energy requirements change as your activity multiplier increases.

7. Save and Export Your Results

Useful results can be saved for comparison. The calculator includes several convenient options:

• Save different calorie and nutrition scenarios.
• Copy a summary of your current results.
• Export calculations as a CSV file.
• Download your calculation data in JSON format.
• Print your results for personal reference.
• Reset the calculator to its default settings.

How to Use the BMR and TDEE Calculator

Using the calculator is simple. Follow these steps to estimate your resting calories, daily energy expenditure, and nutrition targets.

Step 1: Choose Your Measurement System

Select Metric if you want to enter your weight in kilograms and height in centimeters. Choose Imperial if you prefer pounds, feet, and inches.

Step 2: Enter Your Personal Details

Choose your biological sex and enter your age. These details are used by the selected BMR formulas where applicable.

Step 3: Enter Your Height and Weight

Provide your current body weight and height using the selected measurement system. Check your measurements before calculating because incorrect inputs can affect every result.

Step 4: Select a BMR Formula

Choose Mifflin-St Jeor, Revised Harris-Benedict, or Katch-McArdle. If you select Katch-McArdle, enter your estimated body fat percentage as well.

Step 5: Select Your Activity Level

Choose the activity category that most closely matches your typical daily routine. Consider your work, walking, exercise, training frequency, and general movement throughout the day.

Step 6: Choose Your Weight Goal

Select whether you want to maintain your current weight, lose fat, gain weight, or use a custom calorie target. If you choose fat loss or lean gain, adjust the weekly weight-change setting.

Step 7: Set Your Macronutrient Preferences

Enter your preferred protein factor in grams per kilogram, select the percentage of calories allocated to fat, and choose your number of meals per day.

Step 8: Review Your Results

Your estimated BMR, TDEE, and daily goal calories appear in the results section. You can also review protein, fat, and carbohydrate targets, compare activity levels, and read the calculator\'s insights.

Step 9: Save or Export Your Calculation

If you want to compare different scenarios, use Save Scenario. You can also copy your summary, download CSV or JSON data, or print the results.

Benefits of Using a BMR and TDEE Calculator

Understanding your estimated energy requirements can make nutrition planning more organized. A BMR and TDEE Calculator provides a useful starting point for making informed decisions about food intake and activity.

Understand Your Daily Calorie Needs

Many people are unsure how many calories their bodies require. This calculator provides an estimate based on personal measurements and activity level, helping you move beyond generic calorie recommendations.

Plan a More Structured Weight-Loss Approach

Weight management generally involves balancing energy intake with energy expenditure. The calculator can estimate a calorie target below your maintenance level, helping you create an initial nutrition plan.

Support Muscle-Building Nutrition

People working toward muscle growth often need sufficient energy and protein alongside an appropriate resistance-training routine. The lean-gain setting and protein calculation provide useful starting estimates for planning.

Organize Your Daily Macronutrients

Tracking only calories may not give you enough information about your overall nutrition. Protein, fat, and carbohydrate estimates help you organize your daily food intake according to your chosen preferences.

Compare Different Activity Levels

The activity comparison feature helps demonstrate how daily energy requirements may change with movement and exercise. It can also encourage you to think more carefully about your normal activity habits.

Explore Different Nutrition Scenarios

You can change your formula, activity level, calorie goal, or macro preferences and compare the results. This makes the calculator useful when exploring different approaches to fitness and nutrition planning.

Use Cases and Practical Examples

A BMR and TDEE Calculator can be useful for people with different fitness and lifestyle goals. The following examples demonstrate how the calculations can support everyday planning.

Example 1: Estimating Maintenance Calories

Suppose an adult has the following profile:

• Age: 30 years
• Weight: 72 kg
• Height: 175 cm
• Biological sex: Male
• Activity level: Moderate

Using the Mifflin-St Jeor formula, the estimated BMR is approximately 1,674 calories per day.

With a moderate activity multiplier of 1.55, estimated TDEE is approximately 2,595 calories per day.

This provides a starting estimate of the daily calorie intake that may maintain body weight under the selected assumptions.

Example 2: Planning a Fat-Loss Target

Consider the same individual choosing a weekly weight-loss setting of 0.5 kg. The calculator estimates the daily calorie adjustment using the approximate 7,700-calorie energy conversion.

Daily adjustment = 0.5 × 7,700 ÷ 7 = 550 calories.

Using the illustrative TDEE of 2,595 calories, the estimated fat-loss target would be approximately 2,045 calories per day.

This is a mathematical estimate, not a recommendation that the same deficit is suitable for everyone. A smaller deficit may be more appropriate depending on health, training, recovery, and individual circumstances.

Example 3: Estimating Calories for Lean Gain

Someone focused on building muscle may choose the lean-gain option. The calculator adds the selected energy adjustment to estimated TDEE to create a starting calorie target.

For example, a person with an estimated TDEE of 2,500 calories and a selected weekly gain setting of 0.25 kg would receive an estimated daily surplus of approximately 275 calories.

The resulting target would be around 2,775 calories per day. Actual progress should be evaluated using body-weight trends, training performance, and recovery.

Example 4: Planning Daily Protein Intake

Suppose your body weight is 72 kg and your selected protein factor is 1.8 grams per kilogram.

Protein target = 72 × 1.8 = 129.6 grams per day.

If you select four meals per day, the calculator divides this estimate into approximately 32 grams of protein per meal.

Example 5: Comparing Different Activity Levels

A person with the same BMR can have different estimated TDEE values depending on their activity multiplier. Someone with a mostly sedentary routine may have a lower estimated maintenance requirement than someone who performs regular demanding exercise.

The activity comparison chart makes these differences easier to understand without requiring you to enter your personal details repeatedly.

Understanding the BMR Formulas

The calculator includes three formulas that estimate resting energy expenditure. Understanding their differences can help you select the method that best matches the information available to you.

Mifflin-St Jeor Equation

The Mifflin-St Jeor equation uses body weight, height, age, and biological sex.

For males:

BMR = (10 × weight in kg) + (6.25 × height in cm) − (5 × age) + 5

For females:

BMR = (10 × weight in kg) + (6.25 × height in cm) − (5 × age) − 161

This equation is commonly used for estimating resting energy expenditure in adults.

Revised Harris-Benedict Equation

The Revised Harris-Benedict equation is another established method for estimating basal metabolic rate.

For males:

BMR = 88.362 + (13.397 × weight in kg) + (4.799 × height in cm) − (5.677 × age)

For females:

BMR = 447.593 + (9.247 × weight in kg) + (3.098 × height in cm) − (4.330 × age)

The results may differ from Mifflin-St Jeor because the equations use different coefficients and research models.

Katch-McArdle Equation

The Katch-McArdle equation uses estimated lean body mass rather than biological sex and age directly.

First, calculate lean body mass:

Lean Body Mass = Weight × (1 − Body Fat Percentage ÷ 100)

Then calculate BMR:

BMR = 370 + (21.6 × Lean Body Mass in kg)

This formula depends on the accuracy of your body fat estimate. If your body fat percentage is inaccurate, the resulting BMR estimate may also be inaccurate.

How to Understand Your Calorie and Macro Results

After calculating your results, it helps to understand what each number represents.

BMR Result

Your BMR is an estimate of resting energy requirements. It should not automatically be treated as your daily calorie intake target.

TDEE Result

Your TDEE is an estimate of total daily energy expenditure. It is commonly used as the starting point for planning maintenance calories.

Goal Calories

Your goal calories represent the daily intake estimated by the selected goal mode. Maintenance uses estimated TDEE, fat loss subtracts an estimated energy adjustment, lean gain adds an adjustment, and custom mode uses the calorie value you enter.

Protein

Protein provides amino acids that support muscle repair and many other body functions. Your estimated protein target is based on your body weight and selected protein factor.

Fat

Dietary fat provides energy and supports several important biological processes. Your estimated fat target is calculated from the percentage of goal calories allocated to fat.

Carbohydrates

Carbohydrates provide energy for everyday activity and exercise. In this calculator, carbohydrate intake is estimated from the remaining calories after protein and fat have been accounted for.

These macro values are mathematical estimates. Your actual nutrition needs may depend on health conditions, food preferences, training, age, and professional dietary guidance.

Why Choose Our BMR and TDEE Calculator?

Our calculator is designed to make everyday calorie and macro estimation straightforward. It brings important nutrition calculations together in an accessible interface without requiring complicated spreadsheets or manual formula calculations.

• Free to use: Calculate BMR, TDEE, and macro estimates without purchasing a subscription.
• Multiple formulas: Compare three established BMR estimation methods.
• Flexible measurements: Choose metric or imperial units.
• Personalized estimates: Use your age, biological sex, height, weight, and activity level.
• Multiple goals: Explore maintenance, fat loss, lean gain, and custom calorie targets.
• Macro breakdown: Estimate protein, fat, and carbohydrate requirements.
• Instant calculations: Update your inputs and review the recalculated results.
• Scenario history: Save and compare different calculation scenarios during your session.
• Export options: Download results as CSV or JSON, copy a summary, or print your calculations.
• Browser-based experience: Perform calculations directly in your browser without an account.

Tips for Getting More Accurate Results

The quality of your estimate depends on the accuracy of your input information and the assumptions used by the calculation formula. Follow these tips to make your results more useful.

Enter Accurate Measurements

Use a reliable weighing scale and measure your height carefully. Avoid estimating your weight or height when accurate measurements are available.

Select a Realistic Activity Level

Consider your entire day rather than only your planned workouts. A person who exercises several times per week but sits for most of the day may have a different overall activity level from someone with a physically demanding job.

Use a Reliable Body Fat Estimate

If you use Katch-McArdle, enter a reasonable body fat percentage estimate. Different measurement methods can produce different results, so avoid assuming that a consumer device provides a perfectly accurate measurement.

Compare More Than One Formula

Different equations can produce different estimates for the same person. Comparing Mifflin-St Jeor, Revised Harris-Benedict, and Katch-McArdle can help you understand the range of possible estimates.

Monitor Your Progress Over Time

Use your calculated calorie target as a starting point. Track consistent body-weight measurements and review the trend over several weeks rather than making decisions based on a single day\'s result.

Adjust Gradually

If your weight trend differs from your expectations, your actual energy expenditure may be different from the estimate. Consider small adjustments rather than making sudden or extreme changes.

Prioritize Overall Nutrition

Calories and macronutrients are useful planning measurements, but a balanced diet also needs sufficient vitamins, minerals, fiber, and a variety of nutritious foods.

Important Limitations and Health Considerations

A BMR and TDEE Calculator provides estimates based on mathematical equations. It does not directly measure your metabolism or determine your exact calorie requirements.

• Actual energy expenditure can differ because of genetics, body composition, health, medication, and other individual factors.
• Activity multipliers are approximate and may not accurately reflect every lifestyle.
• Body fat estimates can affect the Katch-McArdle calculation.
• Weight change is influenced by water balance, digestion, hormones, and changes in body composition, not just calorie intake.
• Pregnancy, breastfeeding, adolescence, certain medical conditions, and eating disorder recovery may require specialized nutrition guidance.
• Very low calorie targets or aggressive weight-change goals should not be followed without appropriate professional supervision.

The calculator is intended for general educational and fitness planning purposes. It is not a medical diagnostic tool and does not replace advice from a qualified healthcare professional or registered dietitian.

Frequently Asked Questions (FAQs)

1. What is the difference between BMR and TDEE?

BMR estimates the energy your body needs to support basic functions while resting. TDEE estimates your total daily energy expenditure, including resting energy and physical activity. TDEE is generally more useful when estimating daily maintenance calories.

2. Is the BMR and TDEE Calculator free to use?

Yes. You can use the calculator to estimate your BMR, TDEE, daily calorie targets, and macronutrients without paying for a subscription or creating an account.

3. Which BMR formula should I choose?

Mifflin-St Jeor is a commonly used starting option for adults. Revised Harris-Benedict provides an alternative estimate, while Katch-McArdle uses estimated lean body mass. You can compare the results to understand how different formulas affect your estimate.

4. Should I eat the same number of calories as my BMR?

Not necessarily. BMR estimates resting energy requirements, while daily calorie needs also depend on physical activity and other factors. TDEE is generally a more appropriate starting estimate for maintenance calorie planning.

5. How do I calculate maintenance calories?

First, calculate your BMR. Then multiply it by the activity multiplier that best represents your typical lifestyle. The resulting TDEE is an estimate of your maintenance calorie requirement.

6. How many calories should I eat to lose weight?

Weight loss generally requires consuming fewer calories than your body uses over time. The calculator estimates a calorie deficit using your selected weekly weight-change goal. The appropriate deficit depends on your individual circumstances, and aggressive targets may be unsuitable.

7. Can I use this calculator to gain muscle?

Yes. Select the Lean Gain option to estimate a calorie target above your maintenance level. Combine an appropriate nutrition plan with progressive resistance training, sufficient recovery, and consistent monitoring.

8. How is my protein requirement calculated?

The calculator multiplies your body weight in kilograms by your selected protein factor. For example, at 70 kg and 1.8 grams per kilogram, the estimated daily protein target is 126 grams.

9. What is the Katch-McArdle formula?

Katch-McArdle is a BMR estimation equation that uses lean body mass. It first estimates lean body mass from total body weight and body fat percentage, then applies the formula: 370 + (21.6 × lean body mass in kilograms).

10. Why are my BMR results different from other calculators?

Different calculators may use different equations, rounding methods, measurement inputs, or assumptions. Some may use a different activity multiplier or body composition estimate. Small differences are normal.

11. Does exercise increase TDEE?

Physical activity contributes to daily energy expenditure. Regular exercise, walking, sports, and physically demanding work can increase energy use, although the exact amount varies between individuals.

12. How often should I recalculate my TDEE?

You may want to recalculate when your body weight, activity routine, or other important personal measurements change. Reviewing your calorie needs periodically can help keep your planning estimates relevant.

Conclusion

Understanding your daily energy requirements can make nutrition and fitness planning easier. Our free BMR and TDEE Calculator helps you estimate resting calories, maintenance energy needs, weight-management targets, and daily macronutrient requirements using your personal measurements and activity level.

With three BMR formulas, metric and imperial measurements, flexible calorie goals, macro calculations, activity comparisons, and convenient export options, the tool gives you a practical starting point for exploring your nutrition needs.

Enter your details, select your activity level, choose your goal, and review your results. Use these estimates as a starting guide, monitor your progress over time, and make sensible adjustments based on your individual needs. For personalized medical or dietary advice, consult a qualified healthcare professional.