What is the difference between BMR and TDEE?

Basal Metabolic Rate (BMR) is the minimum energy in calories your body burns at complete physical and digestive rest simply to sustain vital organs—such as your brain, heart, lungs, and liver. Total Daily Energy Expenditure (TDEE) takes your BMR and multiplies it by an activity coefficient representing the additional calories burned throughout your day from physical exercise, non-exercise activity thermogenesis (NEAT), and the thermic effect of food (TEF).

Why is the Mifflin-St Jeor equation preferred over Harris-Benedict?

The Mifflin-St Jeor equation was formulated in 1990 based on modern population samples. Extensive independent clinical studies—including reviews by the Academy of Nutrition and Dietetics—have shown that Mifflin-St Jeor predicts resting metabolic rate within 10% of measured calorimetry in over 82% of individuals, outperforming the 1919 Harris-Benedict formula which often overestimates caloric burn in sedentary lifestyles.

How fast is it safe and sustainable to lose weight?

Health authorities and dietitians generally recommend a gradual rate of 0.5 to 1.0 kg (1 to 2 lbs) per week, achieved through a daily caloric deficit of 500 to 750 kcal. Aggressive deficits (>1000 kcal/day) can trigger excessive lean muscle breakdown, metabolic adaptation (slower thyroid and leptin response), micronutrient deficiencies, and gallstones.

What are the safe minimum calorie floors for men and women?

Unless supervised by a physician or bariatric dietitian, daily caloric intake should generally not fall below 1,200 kcal/day for women or 1,500 kcal/day for men. Dropping below these physiological floors risks severe hormonal dysregulation, hair loss, bone density decline, and intense hunger rebounds.

How much protein should I consume daily for fat loss or muscle gain?

For general health, the RDA is 0.8 grams of protein per kilogram of body weight. However, for resistance-trained individuals, bodybuilders, or anyone in a caloric deficit seeking to preserve muscle tissue, sports nutrition consensus (ISSN & ACSM) recommends 1.6 to 2.2 g/kg (0.7 to 1.0 g/lb) of total body weight daily.

Are my personal biometric and nutrition inputs kept private?

Yes. 100% of calculations execute locally inside your client web browser. No personal biometrics, height, weight, activity levels, or dietary preferences are ever sent to an external server or stored in a database.

Daily Calorie & Macro Calculator

Calculate your BMR (Mifflin-St Jeor), Total Daily Energy Expenditure (TDEE), and daily calorie targets for weight loss or muscle gain with customizable macro splits (protein, carbs, fats).

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Daily Calorie & Macro Calculator

Mifflin-St Jeor BMR, Activity-Adjusted TDEE & Macro Gram Breakdown

One-Click Presets:

1. Biometrics & Baseline

Biological Sex (Required for BMR Formula)

Age (Years)10 – 115

Height (cm)e.g. 178 cm

Weight (kg)e.g. 75 kg

2. Lifestyle & Target Goals

Daily Activity Level (Calculates TDEE Multiplier)

Primary Goal & Pace

Macronutrient Diet Profile

Target Daily Energy Goal

2,178kcal / day

Standard Weight Loss (-500 kcal)Expected change: ~0.50 kg/wk

BMR (Base)

1,728

kcal/day at rest

TDEE (Burn)

2,678

maintenance kcal

Macronutrient Distribution Plan

Calculated from daily caloric target: 4 kcal/g (Protein/Carb) and 9 kcal/g (Fat).

Profile: Balanced

P: 30%

C: 35%

F: 35%

Protein (30%)

Carbs (35%)

Fats (35%)

Protein4 kcal / g

163grams/day

Total Energy:653 kcal

Relative Ratio:2.17 g/kg bodyweight

Essential for muscle protein synthesis, enzyme repair, and lean mass preservation.

Carbohydrates4 kcal / g

191grams/day

Total Energy:762 kcal

Relative Ratio:2.55 g/kg bodyweight

Primary fast-acting cellular fuel replenishing glycogen for athletic performance and brain focus.

Healthy Fats9 kcal / g

85grams/day

Total Energy:762 kcal

Relative Ratio:1.13 g/kg bodyweight

Vital for hormone production (testosterone/estrogen), lipid-soluble vitamin absorption, and cell walls.

Step-by-Step Mathematical Derivation

Step 1: Basal Metabolic Rate (Mifflin-St Jeor)

BMR = (10 × weight_kg) + (6.25 × height_cm) - (5 × age) + (+5)

= (10 × 75.0) + (6.25 × 178.0) - (5 × 28) + 5

= 1728 kcal / day

Step 2: Total Daily Energy Expenditure (TDEE)

TDEE = BMR × Activity Multiplier (1.55× for Moderately Active)

= 1728 × 1.55

= 2678 kcal / day (Maintenance)

Step 3: Goal Calorie Adjustment

Target Calories = TDEE + Goal Delta

= 2678 -500 kcal

= 2178 kcal / day

Step 4: Macronutrient Gram Conversions

Protein (30%):

(2178 × 30%) / 4 kcal/g

= 163 g

Carbs (35%):

(2178 × 35%) / 4 kcal/g

= 191 g

Fats (35%):

(2178 × 35%) / 9 kcal/g

= 85 g

1. What are BMR and TDEE?

Understanding energy balance starts with two foundational metrics of human metabolic biology:

Basal Metabolic Rate (BMR)

Your BMR is the exact quantity of energy (calories) your body burns at complete physical, digestive, and emotional rest over 24 hours. Even in a coma, vital physiological processes—heart contractions, cellular respiration, brain neurotransmission, liver detoxification, and renal filtration—consume 60% to 75% of your total daily calories. Our tool utilizes the modern Mifflin-St Jeor Equation, proven to be the gold standard in clinical dietetics.

Total Daily Energy Expenditure (TDEE)

TDEE represents your true daily calorie burn when taking into account all movement and digestion. It consists of four distinct components: BMR (60–75%), Non-Exercise Activity Thermogenesis or NEAT (fidgeting, walking, standing: 15%), Exercise Activity Thermogenesis or EAT (workouts: 5–10%), and the Thermic Effect of Food or TEF (energy required to digest nutrients: ~10%).

2. How to Use the Calorie & Macro Calculator?

Follow these systematic steps to compute your customized nutritional blueprint:

Enter Biometrics

Toggle Metric (cm, kg) or Imperial (ft/in, lbs) and input your biological sex, age, height, and weight.

Pick Activity Level

Choose the descriptor that best matches your average weekly training schedule and job style.

Set Your Target Goal

Select fat loss (-250 to -1000 kcal), maintenance, or lean mass building (+250 to +1000 kcal).

Select Diet Split

Pick Balanced, High Protein, Low Carb, Low Fat, or Keto to receive exact grams of protein, carbs, and fats.

3. Understanding Macronutrients & Energy Yields

All dietary energy consists of three primary macronutrients, each with a specific caloric density and biological role:

Protein4 kcal / gram

Composed of 20 amino acids (9 essential). Has the highest thermic effect of food (TEF ~25%), meaning roughly one-fourth of protein calories are burned during digestion. Crucial for repairing muscle fibers, stimulating immune antibodies, and curbing appetite through peptide YY and GLP-1 release.

Carbohydrates4 kcal / gram

Broken down into glucose, the primary fuel for central nervous system functioning and fast-twitch muscle fibers. Stored as glycogen in the liver (~100g) and skeletal muscle (~400g). High-carb diets maximize anaerobic glycolytic output, sprint performance, and intense resistance training sessions.

Dietary Fats9 kcal / gram

The most energy-dense macronutrient. Dietary fats (monounsaturated, polyunsaturated, and saturated) are vital for testosterone, estrogen, and cortisol synthesis, structural cell membrane integrity, and the absorption of lipid-soluble vitamins A, D, E, and K. Minimum intake should not drop below 0.6 g/kg.

Standard Nutritional Reference Guidelines

Objective	Daily Calorie Delta	Weekly Fat/Mass Rate	Recommended Protein	Best Suited For
Mild Deficit	-250 kcal/day	0.25 kg / 0.55 lbs	1.6 – 2.0 g/kg	Lean lifters, contest prep, minimal hunger tolerance
Standard Fat Loss	-500 kcal/day	0.50 kg / 1.1 lbs	1.8 – 2.4 g/kg	General fitness enthusiasts, sustainable fat burning
Aggressive Cut	-1,000 kcal/day	1.00 kg / 2.2 lbs	2.2 – 2.6 g/kg	High initial body fat (>30%), short-term mini-cuts
Maintenance	0 kcal/day	0 kg / 0 lbs	1.2 – 1.6 g/kg	Diet breaks, lifestyle sustainability, endurance
Lean Bulk	+250 kcal/day	+0.25 kg / +0.55 lbs	1.6 – 2.2 g/kg	Natural bodybuilders seeking hypertrophy without fat
Mass Gain	+500 kcal/day	+0.50 kg / +1.1 lbs	1.6 – 2.0 g/kg	Underweight teens, hardgainers, collision sports

Frequently Asked Questions

Extensive independent clinical validation by the Academy of Nutrition and Dietetics has shown the Mifflin-St Jeor equation to be accurate within ±10% of measured metabolic calorimetry for over 82% of modern adult populations. However, individuals with exceptional muscle mass (e.g., competitive bodybuilders) or significant obesity may experience slight deviations because the formula estimates lean tissue from total mass.

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BMI & Body Fat Percentage Calculator

Calculate your Body Mass Index (BMI) and estimate Body Fat Percentage using the official U.S. Navy circumference method. Includes visual color-coded health gauge and ideal weight ranges.

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Exact Age & Date Calculator

Calculate your exact age down to the day, hour, and second, or perform date math to add and subtract days, weeks, months, and years with leap year accuracy.

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Standard Nutritional Reference Guidelines

Objective	Daily Calorie Delta	Weekly Fat/Mass Rate	Recommended Protein	Best Suited For
Mild Deficit	-250 kcal/day	0.25 kg / 0.55 lbs	1.6 – 2.0 g/kg	Lean lifters, contest prep, minimal hunger tolerance
Standard Fat Loss	-500 kcal/day	0.50 kg / 1.1 lbs	1.8 – 2.4 g/kg	General fitness enthusiasts, sustainable fat burning
Aggressive Cut	-1,000 kcal/day	1.00 kg / 2.2 lbs	2.2 – 2.6 g/kg	High initial body fat (>30%), short-term mini-cuts
Maintenance	0 kcal/day	0 kg / 0 lbs	1.2 – 1.6 g/kg	Diet breaks, lifestyle sustainability, endurance
Lean Bulk	+250 kcal/day	+0.25 kg / +0.55 lbs	1.6 – 2.2 g/kg	Natural bodybuilders seeking hypertrophy without fat
Mass Gain	+500 kcal/day	+0.50 kg / +1.1 lbs	1.6 – 2.0 g/kg	Underweight teens, hardgainers, collision sports

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Daily Calorie & Macro Calculator

Daily Calorie & Macro Calculator

1. Biometrics & Baseline

2. Lifestyle & Target Goals

Macronutrient Distribution Plan

Step-by-Step Mathematical Derivation

1. What are BMR and TDEE?

Basal Metabolic Rate (BMR)

Total Daily Energy Expenditure (TDEE)

2. How to Use the Calorie & Macro Calculator?

Enter Biometrics

Pick Activity Level

Set Your Target Goal

Select Diet Split

3. Understanding Macronutrients & Energy Yields

Standard Nutritional Reference Guidelines

Frequently Asked Questions

Related tools

BMI & Body Fat Percentage Calculator

Exact Age & Date Calculator

Daily Calorie & Macro Calculator

1. Biometrics & Baseline

2. Lifestyle & Target Goals

Macronutrient Distribution Plan

Step-by-Step Mathematical Derivation

1. What are BMR and TDEE?

Basal Metabolic Rate (BMR)

Total Daily Energy Expenditure (TDEE)

2. How to Use the Calorie & Macro Calculator?

Enter Biometrics

Pick Activity Level

Set Your Target Goal

Select Diet Split

3. Understanding Macronutrients & Energy Yields

Standard Nutritional Reference Guidelines

Frequently Asked Questions