How to Calculate Your TDEE: The Complete Step-by-Step Guide
Your TDEE (Total Daily Energy Expenditure) is the total number of calories your body burns every day. Knowing your TDEE is the foundation of any successful diet — whether you want to lose fat, build muscle, or maintain your weight. This guide walks you through exactly how to calculate it yourself, step by step.
Table of Contents
What Is TDEE?
TDEE stands for Total Daily Energy Expenditure. It's the total calories your body uses in 24 hours, combining three components:
- BMR (Basal Metabolic Rate): Calories burned at rest to keep you alive — breathing, heart beating, brain functioning. This is typically 60–75% of TDEE. Learn more about the difference between TDEE and BMR.
- Physical Activity: Calories burned through exercise and daily movement (NEAT). This is 15–30% of TDEE.
- TEF (Thermic Effect of Food): Calories burned digesting food, about 5–15% of TDEE. You can estimate yours with our TEF Calculator.
(TEF is built into the multiplier)
Step 1: Calculate Your BMR
BMR is the number of calories you'd burn if you did nothing but rest for 24 hours. The most accurate widely-used formula is the Mifflin-St Jeor equation:
Mifflin-St Jeor Formula
Men: BMR = (10 × weight in kg) + (6.25 × height in cm) − (5 × age) + 5
Women: BMR = (10 × weight in kg) + (6.25 × height in cm) − (5 × age) − 161
Example: 30-year-old male, 180 lbs (81.6 kg), 5'10" (177.8 cm)
BMR = (10 × 81.6) + (6.25 × 177.8) − (5 × 30) + 5
= 816 + 1,111.25 − 150 + 5 = 1,782 calories/day
Don't want to do the math? Our TDEE Calculator does this automatically. You can also estimate BMR using the Harris-Benedict or Katch-McArdle equation (which uses lean body mass for greater accuracy if you know your body fat percentage).
Step 2: Determine Your Activity Level
Your activity multiplier adjusts BMR to account for daily movement and exercise. Be honest here — most people overestimate their activity level.
| Activity Level | Multiplier | Description |
|---|---|---|
| Sedentary | 1.2 | Desk job, little to no exercise |
| Lightly Active | 1.375 | Light exercise 1–3 days/week or daily walking |
| Moderately Active | 1.55 | Moderate exercise 3–5 days/week |
| Very Active | 1.725 | Hard exercise 6–7 days/week |
| Extremely Active | 1.9 | Intense training twice daily or physical labor job |
What counts as "light exercise"? Light exercise means activities that raise your heart rate slightly but don't leave you breathless: brisk walking, yoga, light cycling, casual swimming. If you work a desk job and walk 30 minutes 3 times a week, you're "Lightly Active." Check our guide on TDEE activity levels explained for more detail.
Step 3: Multiply BMR × Activity Factor
Continuing our example (BMR = 1,782, Moderately Active)
TDEE = 1,782 × 1.55 = 2,762 calories/day
This means our example person burns approximately 2,762 calories per day — that's their maintenance intake.
Step 4: Consider the Thermic Effect of Food
The activity multiplier already includes a rough TEF estimate. But if you want more precision — especially if you eat a high-protein diet — you can calculate TEF separately using our TEF Calculator.
Protein has the highest thermic effect (20–35%), carbs are moderate (5–15%), and fat is lowest (0–5%). A high-protein diet can increase total TEF by 50–100 calories per day. Use our Protein Intake Calculator to optimize your protein target.
How to Adjust TDEE for Your Goals
For Weight Loss
Eat below your TDEE. A deficit of 500 calories per day leads to roughly 1 pound of fat loss per week. Use our Calorie Deficit Calculator to set your target, and read our complete guide on how to calculate a calorie deficit.
Safety minimums: never go below 1,200 calories (women) or 1,500 calories (men) without medical supervision.
For Muscle Gain
Eat above your TDEE by 200–500 calories with adequate protein (1.6–2.2 g/kg body weight). Track your macros to ensure proper protein, carb, and fat ratios.
For Maintenance
Eat at your TDEE. Monitor your weight weekly and adjust by 100–200 calories if weight trends up or down over 2–3 weeks.
Skip the Math — Use Our Calculator
Enter your stats and get your TDEE, BMR, and calorie targets for any goal in seconds.
Calculate Your TDEE Now →Finding the Most Accurate TDEE
No formula is perfectly accurate. Equations like Mifflin-St Jeor are typically within 10% of your true TDEE. To find your most accurate number:
- Start with the calculator estimate from our TDEE Calculator
- Track your intake and weight for 2–3 weeks using a food scale and app
- Adjust based on results: If weight stays stable, that's your true TDEE. If you gain, reduce by 100–200 cal. If you lose, increase by 100–200 cal.
Factors that can affect accuracy include genetics, medication, sleep quality, stress, and hormonal changes (like breastfeeding or pregnancy).
Frequently Asked Questions
How do I calculate my TDEE without a calculator?
Use the Mifflin-St Jeor formula above to find your BMR, then multiply by your activity level (1.2 for sedentary up to 1.9 for extremely active). The result is your estimated TDEE.
What is the most accurate TDEE calculator?
Any calculator using the Mifflin-St Jeor equation with proper activity multipliers is among the most accurate. Our TDEE Calculator uses this formula. For even better accuracy, use the Katch-McArdle formula if you know your body fat percentage.
What's the difference between TDEE and BMR?
BMR is calories burned at rest; TDEE includes BMR plus all physical activity and digestion. TDEE is always higher than BMR. See our full comparison: TDEE vs BMR Explained.
Should I use TDEE to lose weight?
Yes. Calculate your TDEE, then eat 300–500 calories below it. This creates a sustainable calorie deficit for steady fat loss. Use our Calorie Deficit Calculator to plan your target.
How often should I recalculate TDEE?
Recalculate every 10–15 pounds of weight change, or every 8–12 weeks. As you lose weight, your BMR decreases and your TDEE drops, so calorie targets need adjusting.