What is BMR and how is it calculated?

BMR (Basal Metabolic Rate) is the number of calories your body burns at rest to maintain basic physiological functions like breathing, circulation, and cell production. This calculator uses the Harris-Benedict formula which accounts for your gender, age, height, and weight.

What is TDEE and how does it differ from BMR?

TDEE (Total Daily Energy Expenditure) is the total number of calories you burn in a day, including BMR plus calories burned through daily activities, exercise, and digestion. TDEE = BMR × Activity Level multiplier. TDEE is higher than BMR because it accounts for all daily movement.

How do I create a calorie deficit for weight loss?

To lose weight, you need to consume fewer calories than your TDEE. A calorie deficit of 500 calories per day results in approximately 1 pound of weight loss per week (since 1 pound of fat equals 3,500 calories). This calculator helps you determine the exact daily calorie target for your chosen weight loss rate.

What is a safe and sustainable weight loss rate?

A safe and sustainable weight loss rate is typically 1-2 pounds per week. This corresponds to a daily calorie deficit of 500-1,000 calories. Slower weight loss (0.5 lbs/week) is easier to maintain long-term and minimizes muscle loss, while faster rates require larger deficits.

What are macros and why do they matter?

Macros are macronutrients: protein, carbohydrates, and fat. They provide calories and serve different functions: protein builds/maintains muscle, carbs provide energy, and fats support hormones and nutrient absorption. The recommended breakdown is typically 30% protein, 40% carbs, and 30% fat for weight loss, but individual needs vary.

Should I go below the minimum recommended calories?

No, you should not go below 1,200 calories per day for women or 1,500 calories per day for men without medical supervision. Very low calorie diets can cause muscle loss, metabolic slowdown, nutrient deficiencies, fatigue, and other health problems. Sustainable weight loss requires adequate nutrition.

Why is protein important during weight loss?

Protein is crucial during weight loss because it helps preserve muscle mass, keeps you feeling full longer, has a higher thermic effect (burns more calories during digestion), and supports recovery from exercise. Aim for 0.7-1.0g of protein per pound of goal body weight.

How often should I recalculate my calorie needs?

Recalculate your calorie needs every 4-6 weeks as your weight changes. Your TDEE decreases as you lose weight, so your calorie target will need adjustment to continue losing weight at the same rate. Monitor your progress weekly and adjust calories if weight loss stalls.

Does this calculator account for metabolism differences?

The Harris-Benedict formula provides a reliable estimate for most people, but individual metabolism can vary by 10-20%. Factors like muscle mass, genetics, hormones, medications, and metabolic adaptation affect actual calorie burn. Use this calculator as a starting point and adjust based on real-world results.

Can I achieve weight loss without exercise?

Yes, weight loss primarily depends on creating a calorie deficit through diet. However, exercise provides additional benefits: increases calorie burn, preserves muscle during weight loss, improves cardiovascular health, and enhances mental health. Combining diet and exercise is ideal for sustainable weight loss and long-term health.

Calorie Counter for Weight Loss

Calculate your daily calorie needs and create a weight loss plan

Your Information

Gender

Male Female

Age (years)

Height

ft in

Weight (lbs)

Activity Level

Weight Loss Goal

Your Results

BMR (Basal Metabolic Rate)

1998 cal/day

Calories you burn at rest

TDEE (Total Daily Energy Expenditure)

2747 cal/day

Total calories you burn daily

Daily Calorie Goal

2247 cal/day

To achieve your weight loss goal

Weekly Weight Loss

1.0 lbs/week

Projected weight loss

Tip: Consume approximately 2247 calories per day to achieve your weight loss goal. Make sure to eat nutrient-dense foods and consult with a healthcare provider before starting any weight loss program.

Recommended Macro Breakdown

Based on your daily calorie goal of 2247 calories:

Protein

169g

674 cal (30%)

Carbs

225g

899 cal (40%)

Fat

75g

674 cal (30%)

Related Tools

Explore these additional calculators to optimize your health and fitness:

TDEE Calculator Macro Calculator Weight Loss Timeline BMI Calculator

Understanding Calorie Needs and Weight Loss

What This Calculator Does

This Calorie Counter Calculator helps you understand your energy needs and create a personalized weight loss plan. It calculates five essential metrics:

BMR (Basal Metabolic Rate) - Calories your body burns at complete rest
TDEE (Total Daily Energy Expenditure) - Total calories you burn daily including activity
Daily Calorie Goal - Calories to eat for your chosen weight loss rate
Weekly Weight Loss Projection - Expected weight loss per week at your calorie deficit
Macro Breakdown - Recommended protein, carbs, and fat targets

How the Formulas Work

BMR Formula (Harris-Benedict)

BMR is calculated using gender-specific formulas that account for your age, height, and weight:

For Males:

BMR = 88.362 + (4.8871 × height cm) + (14.4454 × weight kg) - (4.6361 × age years)

For Females:

BMR = 447.593 + (3.098 × height cm) + (9.247 × weight kg) - (4.3 × age years)

The Harris-Benedict formula is one of the most accurate methods for estimating BMR. It accounts for the fact that men and women have different metabolic rates due to differences in body composition.

TDEE Calculation

TDEE is calculated by multiplying your BMR by an activity level multiplier:

TDEE = BMR × Activity Level Multiplier

Where activity level ranges from 1.2 (sedentary) to 1.9 (extremely active)

Calorie Deficit for Weight Loss

To lose weight, you create a calorie deficit by eating fewer calories than your TDEE:

Daily Calorie Goal = TDEE - Calorie Deficit

Since 1 pound of fat = 3,500 calories, a 500 calorie daily deficit = 1 lb weight loss per week

Example Calculations

Example 1: Male, 30 years old, 5'10", 200 lbs, Moderately Active

Step 1: Calculate BMR

Height: 5'10" = 70 inches = 177.8 cm
Weight: 200 lbs = 90.7 kg
BMR = 88.362 + (4.8871 × 177.8) + (14.4454 × 90.7) - (4.6361 × 30)
BMR = 88.362 + 869.08 + 1,310.93 - 139.08 = 2,129 calories/day

Step 2: Calculate TDEE

Activity Level: Moderately Active = 1.55
TDEE = 2,129 × 1.55 = 3,300 calories/day

Step 3: Create Calorie Deficit for 1 lb/week Loss

Deficit: 500 calories/day
Daily Calorie Goal = 3,300 - 500 = 2,800 calories/day

Step 4: Macros at 2,800 calories

Protein (30%): 840 cal ÷ 4 = 210g
Carbs (40%): 1,120 cal ÷ 4 = 280g
Fat (30%): 840 cal ÷ 9 = 93g

Example 2: Female, 28 years old, 5'5", 160 lbs, Lightly Active

Step 1: Calculate BMR

Height: 5'5" = 65 inches = 165.1 cm
Weight: 160 lbs = 72.6 kg
BMR = 447.593 + (3.098 × 165.1) + (9.247 × 72.6) - (4.3 × 28)
BMR = 447.593 + 511.31 + 670.95 - 120.4 = 1,509 calories/day

Step 2: Calculate TDEE

Activity Level: Lightly Active = 1.375
TDEE = 1,509 × 1.375 = 2,074 calories/day

Step 3: Create Calorie Deficit for 0.5 lb/week Loss

Deficit: 250 calories/day
Daily Calorie Goal = 2,074 - 250 = 1,824 calories/day

Step 4: Macros at 1,824 calories

Protein (30%): 547 cal ÷ 4 = 137g
Carbs (40%): 730 cal ÷ 4 = 183g
Fat (30%): 547 cal ÷ 9 = 61g

How to Use This Calculator

Step 1: Select Your Gender

Choose whether you are male or female. This determines which BMR formula is used, as men and women have different metabolic rates.

Step 2: Enter Your Personal Information

Input your age (in years), height (in feet and inches), and current weight (in pounds). These measurements are essential for accurate BMR calculation.

Step 3: Select Your Activity Level

Choose the option that best describes your typical week:

Sedentary: Little or no exercise (mainly desk job, sitting)
Lightly Active: Exercise 1-3 days per week
Moderately Active: Exercise 3-5 days per week
Very Active: Exercise 6-7 days per week
Extremely Active: Physical job or training twice per day

Step 4: Choose Your Weight Loss Goal

Select your target weight loss rate:

0.5 lbs/week: Very sustainable, best for long-term (250 cal deficit)
1.0 lbs/week: Recommended balance of speed and sustainability (500 cal deficit)
1.5 lbs/week: Faster pace, requires discipline (750 cal deficit)
2.0 lbs/week: Aggressive, may increase hunger and fatigue (1000 cal deficit)

Step 5: View Your Results and Macros

Your results display automatically. The daily calorie goal is what you should aim to eat each day to achieve your chosen weight loss rate. The macro breakdown shows recommended protein, carb, and fat targets to support muscle preservation and satiety during your weight loss.

Common Questions

Q: How accurate is this calculator?

The Harris-Benedict formula is quite accurate for most people, typically within 10-20% of actual calorie burn. However, individual metabolism varies based on factors like muscle mass, genetics, hormones, and metabolic adaptation. Use this as a starting point and adjust based on real-world results after 2-3 weeks.

Q: What's the difference between BMR and TDEE?

BMR is the calories your body burns at complete rest (sleeping). TDEE is total daily energy expenditure - all calories you burn including BMR, daily activities, workouts, and digestion. TDEE is always higher than BMR. Your weight loss calorie goal is based on TDEE, not BMR.

Q: Can I go below my calculated calorie goal?

No, you should not go below 1,200 calories per day for women or 1,500 calories per day for men without medical supervision. Going too low causes muscle loss, metabolic slowdown, nutrient deficiencies, extreme hunger, and makes weight loss unsustainable. Choose a smaller deficit if the goal feels too restrictive.

Q: How often should I recalculate?

Recalculate your calorie needs every 4-6 weeks as your weight changes. Your TDEE decreases as you lose weight (smaller body = fewer calories burned), so your calorie target needs adjustment to maintain the same deficit and continue losing weight at the same rate.

Q: Do I need to follow the macro breakdown exactly?

The 30% protein, 40% carbs, 30% fat breakdown is recommended but not mandatory. What matters most is hitting your total calorie goal. However, higher protein is generally recommended during weight loss to preserve muscle and increase satiety. You can adjust macros to your preferences as long as calories remain the same.

Q: What if my weight loss plateaus?

Plateaus are normal and usually indicate metabolic adaptation or that you've reached a new equilibrium. To break through: (1) Verify you're tracking calories accurately, (2) Recalculate your TDEE (it may have decreased), (3) Increase exercise or activity, (4) Ensure adequate sleep and stress management. Small adjustments (100-150 calories) are usually more effective than drastic changes.

Tips for Successful Weight Loss

Nutrition Strategies:

Eat plenty of protein to preserve muscle
Include fiber-rich vegetables for fullness
Stay hydrated (drink water throughout day)
Limit processed foods and added sugars
Meal prep to ensure consistency
Track your food intake for accountability

Lifestyle Factors:

Exercise regularly (cardio + strength training)
Get sufficient sleep (7-9 hours per night)
Manage stress levels
Be patient - weight loss takes time
Focus on consistency over perfection
Celebrate non-scale victories

Important: Before starting any weight loss program, consult with a healthcare provider, especially if you have any existing health conditions or are taking medications.

Quick Reference

Weight Loss Formulas:

Calorie Deficit:
250 cal = 0.5 lbs/week
500 cal = 1 lb/week
750 cal = 1.5 lbs/week
1000 cal = 2 lbs/week

Activity Level Multipliers:

Sedentary: 1.2
Lightly Active: 1.375
Moderately Active: 1.55
Very Active: 1.725
Extremely Active: 1.9

Safe Minimums:

Women: 1,200 cal/day
Men: 1,500 cal/day

Key Information

Calorie Values per Gram:

Protein: 4 cal/g
Carbs: 4 cal/g
Fat: 9 cal/g

Weight Loss:

1 pound of fat = 3,500 calories
Recommended: 1-2 lbs/week
Safe minimum: Don't exceed 2 lbs/week

Formula Information

This calculator uses the Harris-Benedict formula, one of the most widely accepted methods for estimating metabolic rate. It's more accurate than simpler methods and accounts for gender differences in metabolism.

Revised in 1984 for improved accuracy, the Harris-Benedict formula provides reliable BMR estimates for most people. Individual results may vary due to genetics, fitness level, and metabolic adaptations.