Estimate your daily calorie needs for weight maintenance, loss, or gain.
Your Results
To maintain your weight, you need 0 calories per day.
Disclaimer: These results are an estimate based on the Mifflin-St Jeor equation and should not be a substitute for professional medical advice.
Calorie Calculator: Estimate Your Daily Energy Needs
Determining your daily calorie requirement is the foundation of any successful nutrition or fitness plan. Whether your goal is weight loss, muscle gain, or maintaining your current weight, knowing your target number gives you full control over your progress.
This Calorie Calculator estimates your Total Daily Energy Expenditure (TDEE)—the exact number of calories your body burns each day based on your age, sex, height, weight, and physical activity level.
How to Use the Calorie Calculator
- Select Your Unit System: Choose between US Units (feet, inches, pounds) or Metric Units (centimeters, kilograms).
- Enter Your Age: Input your age (valid range: 15–80 years).
- Select Your Gender: Choose Male or Female to apply the correct biological metabolic baseline.
- Enter Height and Weight: Input your exact physical measurements.
- Select Activity Level: Pick the option that best reflects your weekly movement routine.
- Click Calculate: Instantly view your calculated calories for maintenance, weight loss, and weight gain.
Understanding the Science: How Calorie Needs Are Calculated
Your daily calorie target is determined using two primary physiological components: Basal Metabolic Rate (BMR) and Total Daily Energy Expenditure (TDEE).
1. Basal Metabolic Rate (BMR)
Your BMR represents the total calories your body burns at complete rest just to keep you alive. This includes basic functions like breathing, circulating blood, cell production, and brain activity.
This tool uses the scientifically validated Mifflin-St Jeor Equation to compute BMR:
- For Men: BMR = (10 × weight in kg) + (6.25 × height in cm) – (5 × age in yrs) + 5
- For Women: BMR = (10 × weight in kg) + (6.25 × height in cm) – (5 × age in yrs) – 161
2. Total Daily Energy Expenditure (TDEE)
Once your baseline BMR is established, it is multiplied by an activity factor to determine your total daily calorie expenditure.
TDEE = BMR × Activity Multiplier
Daily Activity Level Multipliers
| Activity Level | Description | Multiplier |
|---|---|---|
| Sedentary | Little or no formal exercise, desk job | 1.200 |
| Lightly Active | Light exercise 1–3 days per week | 1.375 |
| Moderately Active | Moderate exercise 3–5 days per week | 1.550 |
| Very Active | Hard exercise or sports 6–7 days per week | 1.725 |
| Extra Active | Intense daily training or heavy manual labor job | 1.900 |
Calories for Weight Loss, Maintenance, and Weight Gain
Once you know your baseline maintenance calories (TDEE), you can adjust your daily intake according to your specific health objective:
Weight Loss
Reduce intake to burn body fat safely.
-500 kcal / dayWeight Maintenance
Match intake to total daily output.
0 kcal changeWeight Gain
Increase intake to build lean muscle.
+500 kcal / dayWeight Maintenance Details
Eating equal to your TDEE keeps your weight stable. Your daily caloric intake directly balances your energy output.
Safe Weight Loss (Calorie Deficit)
To lose weight safely, you must create a sustained calorie deficit:
- Mild Weight Loss (-0.5 lbs/week): Eat 250 calories below maintenance daily.
- Standard Weight Loss (-1 lb/week): Eat 500 calories below maintenance daily.
- Maximum Safe Deficit (-2 lbs/week): Eat 1,000 calories below maintenance daily.
Clean Weight Gain (Calorie Surplus)
To gain weight or build lean body mass, you need a controlled calorie surplus:
- Lean Bulking (+0.5 to 1 lb/week): Eat 250 to 500 calories above maintenance daily alongside regular resistance training.
5 Factors That Influence Your Daily Calorie Needs
- Body Composition: Lean muscle mass burns more calories at rest than body fat. Higher muscle tissue equals a higher BMR.
- Age: Biological metabolism slows by approximately 1–2% per decade after age 30 due to natural muscle loss.
- Biological Sex: Males generally possess higher muscle mass and lower fat percentage, leading to higher baseline calorie requirements.
- Hormonal Health: Thyroid activity, insulin sensitivity, and stress hormones like cortisol affect daily metabolic speed.
- Thermic Effect of Food (TEF): Digesting food requires energy. Dietary protein requires the most energy to break down (~20–30% of its caloric value).
Frequently Asked Questions (FAQs)
How many calories should I cut to lose 1 pound per week?
To lose 1 pound of body weight per week, aim for a total weekly deficit of 3,500 calories, which translates to a daily reduction of 500 calories below your maintenance level (TDEE).
Is this calculator accurate for both men and women?
Yes. The tool utilizes gender-specific formulas that account for baseline metabolic and anatomical differences between men and women.
What equation does this calorie calculator use?
This tool uses the Mifflin-St Jeor equation, widely accepted by medical and dietary research as the most accurate formula for estimating resting BMR.
Should I eat back the calories I burn during exercise?
No. Your selected activity level already accounts for your average weekly exercise routine. Adding workout calories back into your daily allotment often leads to overestimation and stalled progress.
What happens if my calorie intake drops too low?
Consistently dropping below essential minimums (1,200 kcal/day for women, 1,500 kcal/day for men) can cause muscle loss, metabolic slowdown, severe lethargy, and nutritional deficiencies.
How often should I recalculate my daily calorie target?
Recalculate your calorie targets every time your weight changes by 5 to 10 pounds, or whenever your regular physical activity routine shifts significantly.
What is the main difference between BMR and TDEE?
BMR is the energy your body burns strictly at rest to sustain basic life functions. TDEE is your BMR plus all additional calories burned through daily movement, work, and exercise.
Does age impact daily calorie requirements?
Yes. Resting metabolic rate decreases as you age, primarily due to the natural loss of lean muscle mass and age-related hormonal adjustments.
Why am I not losing weight while staying in a calorie deficit?
Common factors include underestimating food portion sizes, untracked high-calorie liquids or snacks, or short-term fluid retention driven by sodium intake or intense exercise recovery.
Can I build muscle while in a calorie deficit?
Yes, particularly for beginners or individuals returning from a training break. Maintain a high protein intake (0.7–1.0g per pound of body weight) and follow a progressive resistance training program.