How to Calculate Your TDEE: Formula, Steps, and Examples
Have you ever entered your age, weight, and activity level into a calorie calculator and received a number that did not seem right? One calculator may show 2,200 calories while another gives you 2,600.
That can make it difficult to choose a realistic calorie target.
Your daily energy needs depend on more than exercise. Resting energy expenditure, daily movement, exercise, digestion, body size, and lifestyle all play a role. Fortunately, learning how to calculate your TDEE is easier once you understand the formula and the activity factor.
This guide explains the calculation step by step, shows real-world examples, and explains how to check whether your estimate makes sense.
What Is TDEE?
TDEE stands for Total Daily Energy Expenditure. It represents the estimated amount of energy your body uses throughout a typical 24-hour day.
TDEE includes several energy components:
- Resting energy expenditure (REE/BMR)
- Exercise activity thermogenesis (EAT)
- Non-exercise activity thermogenesis (NEAT)
- Thermic effect of food (TEF)
Therefore, TDEE is not simply the calories you burn during structured workouts. Your everyday movement can also make a meaningful difference. Non-exercise activity thermogenesis, or NEAT, includes activities such as walking, standing, household tasks, and other movement outside planned exercise. Research shows that NEAT can vary considerably between people. (PubMed [1])
Most TDEE calculations are estimates rather than direct laboratory measurements.
TDEE Formula
The basic formula is:
Basic TDEE Formula: TDEE = BMR × Activity Factor
First, estimate your resting energy needs (BMR). Next, select an activity factor that matches your normal lifestyle. Finally, multiply the two numbers.
Formula Calculation Example:
Estimated BMR = 1,780 calories/day
Selected Activity Factor = 1.55 (Moderately Active)
TDEE = 1,780 × 1.55 = 2,759 calories/day
This means the estimated daily energy requirement is about 2,760 calories per day.
How to Calculate Your TDEE
The process has three main steps:
3-Step TDEE Calculation Process:
- Calculate your BMR or estimated resting energy expenditure.
- Choose the activity factor that best matches your routine.
- Multiply your resting estimate by that activity factor.
Step 1: Calculate Your BMR
A commonly used equation is the Mifflin-St Jeor equation. The original study developed the equation from measured resting energy expenditure in 498 healthy adults. (PubMed [2])
For Men: BMR = (10 × weight in kg) + (6.25 × height in cm) − (5 × age) + 5
For Women: BMR = (10 × weight in kg) + (6.25 × height in cm) − (5 × age) − 161
For example, consider a 30-year-old man who weighs 80 kg and is 180 cm tall:
Step 1 (Weight): 10 × 80 kg = 800
Step 2 (Height): 6.25 × 180 cm = 1,125
Step 3 (Age penalty): 5 × 30 years = 150
Step 4 (Male Constant): +5
BMR = 800 + 1,125 − 150 + 5 = 1,780 calories/day
Strictly speaking, the Mifflin-St Jeor equation predicts resting energy expenditure rather than measuring BMR under laboratory conditions. However, many online calculators use “BMR” as a simple label for this estimate. Estimate your baseline resting floor with our BMR Calculator.
The equation is widely used because research has found it to perform well among commonly used resting metabolic rate prediction equations, although individual errors can still occur. (PubMed [3])
Step 2: Choose Your Activity Factor
The next step is selecting an activity multiplier:
| Activity Level Category | Factor | General Routine Description |
|---|---|---|
| Sedentary | 1.200 | Little to no structured exercise, desk job |
| Lightly Active | 1.375 | Light exercise or regular movement 1–3 days/week |
| Moderately Active | 1.550 | Moderate exercise or an active daily routine 3–5 days/week |
| Very Active | 1.725 | Hard training or a physically active lifestyle 6–7 days/week |
| Extra Active | 1.900 | Very demanding physical labor work + daily intense training |
These categories are estimates. Your exercise schedule is only one part of the decision.
For instance, someone who trains three times a week but sits for most of the day may have different energy needs from someone who trains three times a week and also walks, stands, and performs physical work throughout the day.
Therefore, consider your whole routine, not only your workouts.
Step 3: Multiply BMR by Your Activity Factor
Now apply the selected factor.
Using the example above:
BMR = 1,780 calories/day
Activity Factor = 1.55
TDEE = 1,780 × 1.55 = 2,759 calories/day
So, the estimated TDEE is approximately 2,760 calories per day.
That number represents an estimated maintenance level, not a guaranteed daily calorie burn.
TDEE Calculation Example for a Woman
Consider a 30-year-old woman who weighs 65 kg and is 165 cm tall.
Using the Mifflin-St Jeor equation:
BMR = (10 × 65) + (6.25 × 165) − (5 × 30) − 161
BMR = 650 + 1,031.25 − 150 − 161 ≈ 1,370 calories/day
If she is moderately active (1.55 multiplier):
TDEE = 1,370 × 1.55 ≈ 2,124 calories/day
Her estimated daily energy expenditure would therefore be about 2,124 calories per day.
How to Calculate TDEE With Pounds and Inches
The Mifflin-St Jeor equation uses metric units (kilograms and centimeters).
If your measurements are in pounds and inches, convert them first:
- Weight Conversion: Kilograms = Pounds ÷ 2.205
- Height Conversion: Centimeters = Inches × 2.54
For example, 176 pounds is approximately 79.8 kg (176 ÷ 2.205).
Likewise, 70 inches is approximately 177.8 cm (70 × 2.54).
After conversion, enter the metric values into the equation.
Why Do TDEE Calculators Give Different Results?
Different calculators can produce different numbers because they may use different equations, activity assumptions, rounding methods, or definitions of activity.
More importantly, prediction equations cannot capture every factor affecting an individual's energy expenditure.
Body composition, occupation, daily movement, exercise, and lifestyle can all affect actual energy use. NEAT is particularly variable between individuals. (PubMed [1])
How Accurate Is a TDEE Calculation?
A calculated TDEE should be treated as a starting estimate, not an exact measurement.
Research on resting energy prediction equations shows that accuracy varies between individuals and populations. Even equations that perform well on average can produce meaningful errors for some people. (PubMed [4])
How to Check Your Estimated TDEE
Track your calorie intake and body weight consistently over several weeks.
If your average body weight remains relatively stable, your average calorie intake may be close to your actual maintenance requirement.
If your weight consistently changes, your real maintenance level may differ from the original estimate.
Is TDEE the Same as Maintenance Calories?
TDEE and maintenance calories are closely related, but they are not always used in exactly the same way.
- TDEE is an estimate of your total daily energy expenditure.
- Maintenance calories generally refer to the average calorie intake that maintains your body weight over time. See our Maintenance Calorie Calculator.
Common TDEE Calculation Mistakes
- Using pounds directly in a metric equation
- Entering height in inches instead of centimeters
- Choosing an activity level based only on gym sessions
- Treating TDEE as an exact measurement
- Changing calorie targets too quickly based on 1 day's weigh-in
Frequently Asked Questions
What is the formula for calculating TDEE?
The basic formula is TDEE = BMR × activity factor. First estimate resting energy expenditure (Mifflin-St Jeor), then multiply it by the activity factor that best represents your normal lifestyle.
What is the most accurate way to calculate TDEE?
There is no single equation that gives an exact TDEE for every person. Prediction equations provide estimates, while actual maintenance can be evaluated by consistently tracking calorie intake and body-weight trends over time.
How accurate is a TDEE calculator?
A TDEE calculator provides an estimate. Prediction equations can have individual errors, so your calculated number should be treated as a starting point and adjusted based on real-world results.
How often should I recalculate my TDEE?
Recalculate when your body weight, activity level, or routine changes significantly (e.g. ±3 to 5 kg weight change). Otherwise, you can continue monitoring your results and adjust your calorie target when needed.
Calculate Your TDEE
If you do not want to calculate each step manually, use our homepage TDEE Calculator to estimate your daily energy needs from your age, sex, height, weight, and activity level.
Key Takeaways
Learning how to calculate your TDEE comes down to three steps: estimate your resting energy needs, select an appropriate activity factor, and multiply the two values.
Methodology & Scientific References
- Levine JA. Non-exercise activity thermogenesis (NEAT): a component of total daily energy expenditure. Work. 2007. (PubMed [1])
- Mifflin MD, St Jeor ST, et al. A new predictive equation for resting energy expenditure in healthy individuals. Am J Clin Nutr. 1990. (PubMed [2])
- Frankenfield D, et al. Comparison of predictive equations for resting metabolic rate in healthy nonobese and obese adults. J Am Diet Assoc. 2005. (PubMed [3])
- Jagim AR, et al. Estimation of energy expenditure using prediction equations in overweight and obese adults. Res Sports Med. 2016. (PubMed [4])
Last reviewed: October 2026
A Word From Our Team
Our goal is to bring scientific clarity to daily energy calculations. By explaining the exact math, equations, activity factors, and individual limitations, we help you replace dietary guesswork with actionable baseline estimates.
Important: This article is for general educational purposes and does not replace individualized medical or nutrition advice.