How to Calculate TDEE (Total Daily Energy Expenditure): Formula

Introduction

Your Total Daily Energy Expenditure (TDEE) is calculated with a two-step formula: TDEE = BMR x Activity Multiplier, where BMR is your Basal Metabolic Rate (the calories you burn at complete rest) and the activity multiplier is a number between 1.2 and 1.9 that reflects how active you are. In plain terms, you first estimate the energy your body needs just to stay alive, then scale it up to account for movement, exercise, and digestion. If you would rather skip the arithmetic and get an instant number, the TDEE Calculator does both steps for you.

TDEE is the single most useful number in any nutrition plan. It tells you your maintenance calories, the amount you can eat to hold your weight steady. Once you know that anchor point, every goal becomes a simple adjustment: eat below it to lose fat, eat above it to build muscle, or eat right at it to stay the same. This guide walks through the full calculation by hand, with real numbers, so you understand exactly where your target comes from.

Step 1: Calculate Your BMR

Before you can find TDEE, you need your Basal Metabolic Rate. The most accurate and widely recommended equation for healthy adults is the Mifflin-St Jeor formula, published in 1990 and endorsed by the Academy of Nutrition and Dietetics. It uses weight in kilograms, height in centimeters, and age in years.

For men:

BMR = (10 x weight kg) + (6.25 x height cm) - (5 x age) + 5

For women:

BMR = (10 x weight kg) + (6.25 x height cm) - (5 x age) - 161

The only difference between the two versions is the final constant: men add 5, women subtract 161. That gap accounts for average differences in muscle mass and body composition between sexes.

If you use pounds and inches, convert first. Divide pounds by 2.205 to get kilograms, and multiply inches by 2.54 to get centimeters. A person who weighs 200 pounds is 200 / 2.205 = 90.7 kg, and someone who is 71 inches tall is 71 x 2.54 = 180.3 cm.

Step 2: Apply the Activity Multiplier

BMR only covers you at rest. Real life involves walking, working, training, and digesting food, all of which burn extra energy. To capture that, you multiply your BMR by an activity factor. These standard multipliers have been used in nutrition science for decades:

Activity Level	Description	Multiplier
Sedentary	Desk job, little or no exercise	1.2
Lightly active	Light exercise 1 to 3 days per week	1.375
Moderately active	Moderate exercise 3 to 5 days per week	1.55
Very active	Hard exercise 6 to 7 days per week	1.725
Extra active	Physical job plus daily training	1.9

The most common mistake here is overestimating. Most people who work an office job and train a few times a week fall into the “lightly active” or “moderately active” range, not “very active.” When in doubt, choose the lower multiplier. It is easier to add calories later than to wonder why the weight is not moving.

Worked Example 1: Moderately Active Woman

Meet Priya: 32 years old, 65 kg, 165 cm tall, and moderately active (she lifts weights three times a week and walks daily). Here is the calculation, step by step.

Step 1 - BMR (women’s formula):

10 x 65 = 650
6.25 x 165 = 1,031.25
5 x 32 = 160
BMR = 650 + 1,031.25 - 160 - 161 = 1,360 calories

Step 2 - Apply the multiplier (1.55 for moderately active):

TDEE = 1,360 x 1.55 = 2,108 calories

So Priya burns roughly 2,108 calories on an average day. If she eats about 2,100 calories, her weight stays steady. To lose fat at a comfortable pace, she would drop to around 1,600 calories per day, as we will see in the goals section below.

Worked Example 2: Sedentary Man With a Desk Job

Meet David: 40 years old, 85 kg, 180 cm tall, and sedentary. He works at a computer all day and does not currently exercise.

Step 1 - BMR (men’s formula):

10 x 85 = 850
6.25 x 180 = 1,125
5 x 40 = 200
BMR = 850 + 1,125 - 200 + 5 = 1,780 calories

Step 2 - Apply the multiplier (1.2 for sedentary):

TDEE = 1,780 x 1.2 = 2,136 calories

Notice something interesting: David and Priya have almost identical TDEE numbers despite David being larger and heavier. Why? Priya’s higher activity level closes the gap. This is the whole point of the multiplier, and it shows why two people of very different sizes can need similar amounts of food.

Worked Example 3: Working in Pounds and Inches

Many readers think in imperial units, so here is a full conversion example. Meet Marcus: 45 years old, 200 pounds, 5 feet 11 inches (71 inches) tall, and lightly active.

Convert the units first:

Weight: 200 / 2.205 = 90.7 kg
Height: 71 x 2.54 = 180.3 cm

Step 1 - BMR (men’s formula):

10 x 90.7 = 907
6.25 x 180.3 = 1,127
5 x 45 = 225
BMR = 907 + 1,127 - 225 + 5 = 1,814 calories

Step 2 - Apply the multiplier (1.375 for lightly active):

TDEE = 1,814 x 1.375 = 2,494 calories

Marcus maintains his weight at about 2,494 calories per day. If he stays honest about his activity level and does not slide into overestimating it, this number will serve as a reliable planning anchor.

Turning TDEE Into a Calorie Goal

TDEE by itself is your maintenance number. To reach a goal, you adjust up or down. The most durable approach uses modest changes rather than crash extremes. A pound of body fat holds roughly 3,500 calories, so a daily deficit of about 500 calories predicts around one pound of loss per week.

Goal	Daily Adjustment	Priya (TDEE 2,108)	Marcus (TDEE 2,494)
Lose ~1 lb per week	TDEE minus 500	1,608 cal	1,994 cal
Lose ~0.5 lb per week	TDEE minus 250	1,858 cal	2,244 cal
Maintain weight	TDEE	2,108 cal	2,494 cal
Lean gain	TDEE plus 250	2,358 cal	2,744 cal

These are starting points, not guarantees. Your body responds to real food and real training, not to a spreadsheet, so treat the number as a hypothesis you test against the scale over two to three weeks. If Priya eats 1,608 calories and loses weight faster or slower than expected, she nudges the number and re-checks. That feedback loop, not the formula, is what ultimately gets results.

Why TDEE Estimates Vary Between Calculators

If you plug the same numbers into three different tools, you may get three slightly different answers. That is normal and comes down to a few factors:

The BMR equation used. Mifflin-St Jeor tends to read lower than the older Harris-Benedict equation, sometimes by 100 calories or more.
How activity is bucketed. Some tools split “moderate” into two tiers or use different multiplier values, which shifts the result.
Body composition. Standard formulas do not know your muscle-to-fat ratio. A muscular person of a given weight burns more at rest than the equation predicts, while someone with more body fat burns a bit less.

None of this makes the estimate useless. It simply means you should treat any single number as a well-informed starting point rather than a precise measurement. The formula gets you into the right neighborhood; tracking your own results finds the exact address.

Common Mistakes to Avoid

Overestimating your activity level. This is the number one error. Selecting “very active” when you train three times a week can inflate your TDEE by hundreds of calories and quietly stall fat loss. When unsure, pick the lower tier.
Counting exercise twice. The activity multiplier already includes your workouts. If you then add calories from a fitness tracker on top, you double-count and eat too much.
Forgetting to recalculate. As you lose weight, your BMR drops because a smaller body burns less. A number that was correct 20 pounds ago will be too high today.
Mixing up units. Using pounds where the formula expects kilograms, or inches where it expects centimeters, produces wildly wrong results. Always convert first.
Chasing a perfect number. No calculator can be exact. Spending hours hunting for the “true” figure is less useful than picking a reasonable estimate and adjusting based on real-world feedback.
Cutting far below your BMR. Setting a goal beneath your resting calorie needs is unsustainable and can backfire. Deficits work best when they are moderate and livable.

Putting It All Together

Calculating TDEE comes down to two moves: estimate your resting burn with the Mifflin-St Jeor BMR formula, then multiply by an honest activity factor between 1.2 and 1.9. That gives you maintenance calories, the foundation for any weight-loss, muscle-gain, or maintenance plan. From there, a modest 250 to 500 calorie adjustment turns your maintenance number into a goal you can actually reach.

The math is straightforward, but the discipline is in staying realistic about your activity level and updating the number as your body changes. Run your own figures through the TDEE Calculator to get an instant result, then verify it against the scale over a few weeks.

To go deeper on the pieces behind this calculation, read our guide on what BMR is and how it is estimated, and once you know your maintenance calories, learn how to apply them in building a sustainable calorie deficit for weight loss. Together, those three numbers, your BMR, your TDEE, and your target deficit, give you everything you need to take control of your nutrition with confidence.

Frequently Asked Questions

How accurate is a TDEE calculation? +

A TDEE calculation is an educated estimate, typically accurate to within 5 to 10 percent for most healthy adults. The formulas rely on population averages, so your real number depends on genetics, muscle mass, and hormones. The most reliable way to confirm your TDEE is to track your intake and weight for two to three weeks and adjust from what actually happens on the scale.

Should men and women use different TDEE formulas? +

The activity multipliers are identical for both sexes, but the underlying BMR equation differs by a constant. The Mifflin-St Jeor formula adds 5 for men and subtracts 161 for women, which reflects average differences in body composition. Everything else in the calculation, including the activity multiplier step, works exactly the same way.

How often should I recalculate my TDEE? +

Recalculate whenever your body weight changes by roughly 10 pounds or 5 kilograms, since a lighter or heavier body burns a different number of calories. You should also update it if your activity level shifts, for example after starting a new training program or changing jobs. Reviewing it every four to six weeks during an active diet keeps your targets realistic.

Does TDEE include the calories burned digesting food? +

Yes. TDEE bundles together four components: your basal metabolic rate, the thermic effect of food, the energy used during exercise, and the calories burned through everyday movement. The thermic effect of food, the energy cost of digesting meals, accounts for roughly 10 percent of most people's total burn and is already baked into the activity multiplier.

Can I lose weight without knowing my exact TDEE? +

Yes, but knowing your TDEE makes the process far more predictable. Without it you are guessing at how much to eat, which often leads to cutting too aggressively or not enough. A TDEE estimate gives you a starting maintenance number, and from there you subtract a modest amount to create a sustainable calorie deficit you can track and adjust.