Daily Calorie Needs (TDEE) Calculator: Calculate Your Daily Energy Expenditure
Total Daily Energy Expenditure via the Mifflin-St Jeor equation
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Reviewed against primary sources.
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TDEE is a population estimate. Individual variation in metabolism is roughly ±10%. Treat the number as a starting point and adjust based on 2–4 weeks of consistent data.
Total Daily Energy Expenditure (TDEE) is the calories your body burns daily, combining your basal metabolic rate (energy at rest) with activity. It's a baseline for weight management. A daily 500-calorie deficit typically leads to one pound of weight loss per week.
The Daily Calorie Needs (TDEE) Calculator helps you accurately estimate your total daily energy expenditure, a crucial metric for managing your weight. By inputting your sex, age, height, weight, and activity level, the calculator uses the well-regarded Mifflin-St Jeor equation to determine your basal metabolic rate (BMR) and then applies an activity factor. This provides a personalized estimate of the calories your body burns each day, serving as a foundational baseline for effective weight loss, maintenance, or gain strategies. Understanding your TDEE empowers you to make informed dietary and exercise choices.
What is a daily calorie needs (tdee)?
This TDEE calculator estimates your total daily energy expenditure — the total calories you burn in a day from resting metabolism plus physical activity. Enter your age, sex, height, weight, and activity level. The calculator computes your basal metabolic rate using the Mifflin-St Jeor equation, then multiplies it by an activity factor to give you a daily calorie target. Use TDEE as the anchor number for weight loss (subtract 300–500 calories), weight gain (add 250–500 calories), or maintenance (eat at TDEE). For most adults the Mifflin-St Jeor equation predicts BMR within ±10% of indirect-calorimetry measurement and is the standard recommended by the American Dietetic Association and the Academy of Nutrition and Dietetics. Recompute every 4–6 weeks as your weight changes.
The formula
- BMR — basal metabolic rate, calories/day at rest
- TDEE — total daily energy expenditure, calories/day
- weight — in kilograms
- height — in centimeters
- age — in years
Source: Mifflin-St Jeor Equation for BMR; WHO/ACSM Activity Factors.
Worked examples
130-year-old man, moderate activity
A 30-year-old man at 178 cm and 75 kg with moderate activity burns about 2,637 calories per day — roughly 1,700 at rest plus 937 from daily movement and 3–5 weekly workouts. For a pound-per-week loss, target about 2,137 calories; for recomposition, hold steady at TDEE.
2Same person, sedentary lifestyle
Drop the activity factor to sedentary and the same person only needs about 2,041 calories a day. That's a 600-calorie swing from activity alone — the single biggest lever in the equation, which is why dishonest self-assessment here derails most calorie-counting plans.
340-year-old woman, light activity
A 40-year-old woman at 165 cm and 65 kg with light activity (1-3 workouts per week) has a BMR of approximately 1,320 calories. Her TDEE would be around 1,815 calories per day. To lose one pound per week, she would aim for approximately 1,315 calories daily.
How to use this calculator
- Sex (default: 1)
- Age
- Height
- Weight
- Activity level (default: 1.55)
- Read the result. Use the worked examples below to sanity-check against a known scenario.
What your result means and what to do next
Common mistakes and edge cases
Overstating activity level. "I go to the gym 3 times a week" often maps to "Light" or "Moderate," not "Active." The Very Active tier really is for physically-laboring jobs plus daily hard training. Overstating activity inflates your TDEE by 300–500 calories, which then silently fails your weight goal.
Using the formula during rapid weight change. BMR drops as you lose weight — the equation doesn't know you've cut 20 kg, so it overestimates your new TDEE. Recalculate at your current weight every 5–10 pounds of change.
Treating the number as exact. If your weight isn't moving on a 500-calorie deficit after 3 weeks, your actual intake is likely under-counted or your activity factor is overestimated — not because the formula is wrong, but because population-fit formulas have individual variance.
How small changes affect your result
**TDEE increases from 2637 to 2935 calories (+298 calories).:**
Activity multipliers applied to BMR — same person, different activity levels
| Activity level | Description | Multiplier | TDEE for a 2,000 kcal BMR |
|---|---|---|---|
| Sedentary | Desk job, little or no exercise | 1.20 | 2,400 kcal |
| Lightly active | Light walking or 1–3 light workouts per week | 1.375 | 2,750 kcal |
| Moderately active | 3–5 moderate workouts per week | 1.55 | 3,100 kcal |
| Very active | 6–7 hard workouts per week or physical job | 1.725 | 3,450 kcal |
| Extra active | Twice-daily training or very physical job + sport | 1.90 | 3,800 kcal |
Multipliers from the WHO/FAO/UNU Joint Expert Consultation on Energy Requirements (2001) and ACSM Guidelines for Exercise Testing (11th ed., 2021). If your weight tracks for two consecutive weeks, your effective multiplier is correct.
Frequently asked questions
Should I use TDEE or BMR for weight loss?
Why does age lower calorie needs?
What if my weight isn't changing at the calculated intake?
Is TDEE accurate for everyone?
How does muscle mass affect TDEE?
Can I use TDEE for children or pregnant women?
What is the difference between BMR and RMR?
How often should I recalculate my TDEE?
Daily Calorie Needs (TDEE) glossary
How we built this calculator
Methodology
The Mifflin-St Jeor equation, published in 1990, is the current gold standard for basal metabolic rate estimation. It fits a simple linear regression against indirect calorimetry measurements — oxygen consumption in a lab, converted to calories via the respiratory exchange ratio. It's within ±10% of lab-measured BMR for about 80% of adults.
This calculator was written by Numora health team and reviewed by Numora editorial review board, Registered Dietitian (RD) before publication. Both names link to full bios with verifiable credentials.
Sources & references
Every numeric assumption traces to a primary source.
- Mifflin MD et al. — A new predictive equation for resting energy expenditureUSA
- Academy of Nutrition and Dietetics — Energy expenditure guidelinesUSA
- WHO Technical Report Series 724: Energy and protein requirementsINT
- Food and Nutrition Board, Institute of Medicine. Dietary Reference Intakes for Energy, Carbohydrate, Fiber, Fat, Fatty Acids, Cholesterol, Protein, and Amino AcidsUSA
- American College of Sports Medicine (ACSM) - Guidelines for Exercise Testing and PrescriptionINT
- Harris-Benedict Equation (historical context)INT
- Katch, Frank I., and Victor L. Katch. Sport and exercise nutritionINT
- National Institutes of Health (NIH) - Body Weight PlannerUSA
- Numora Editorial Policy. numora.net/editorial-policy
This calculator is for informational purposes only and does not constitute medical advice. Numbers shown are estimates based on the inputs you provide. Conventions and regulations vary by country. Consult a qualified healthcare provider in your country before making decisions based on these results.