TDEE Calculator

TDEE Calculator

Your Total Daily Energy Expenditure (TDEE) is the total number of calories your body burns in a 24-hour period -- from basic organ function to exercise to digesting your meals. Getting this number right is the prerequisite for everything else in nutrition: without knowing your maintenance calories, any diet plan is just guesswork. This calculator uses the Mifflin-St Jeor equation combined with standardized activity multipliers to produce a reliable estimate of your daily calorie burn so you can set an informed deficit, surplus, or maintenance target.

How TDEE Is Calculated

TDEE is calculated in two steps. First, your Basal Metabolic Rate (BMR) is estimated using the Mifflin-St Jeor equation:

• Men: BMR = (10 x weight in kg) + (6.25 x height in cm) -- (5 x age) + 5
• Women: BMR = (10 x weight in kg) + (6.25 x height in cm) -- (5 x age) -- 161

Then, BMR is multiplied by an activity factor to account for all energy burned beyond pure rest:

TDEE = BMR x Activity Multiplier. This result equals your maintenance calories -- eat at this level to hold your weight steady.

Worked Examples

Example 1 -- Sedentary male trying to lose 20 lbs. Greg is a 34-year-old male, 5'11" (180 cm), 215 lbs (97.5 kg). His BMR = (10 x 97.5) + (6.25 x 180) -- (5 x 34) + 5 = 975 + 1,125 -- 170 + 5 = 1,935 calories. At a sedentary multiplier of 1.2, his TDEE is approximately 2,322 calories. To lose 1 lb per week, he targets 1,822 calories -- a manageable 500-calorie daily deficit.

Example 2 -- Active woman maintaining weight. Mei is a 29-year-old female, 5'5" (165 cm), 130 lbs (59 kg), who does CrossFit 4 days per week. Her BMR = (10 x 59) + (6.25 x 165) -- (5 x 29) -- 161 = 590 + 1,031 -- 145 -- 161 = 1,315 calories. At moderately active (1.55), her TDEE is approximately 2,038 calories. She has been eating around 2,000 calories and her weight has been stable for months -- confirming the estimate is accurate.

Example 3 -- College athlete during training season. Ben is a 21-year-old male, 6'0" (183 cm), 185 lbs (84 kg), training twice daily during soccer pre-season. His BMR = (10 x 84) + (6.25 x 183) -- (5 x 21) + 5 = 840 + 1,144 -- 105 + 5 = 1,884 calories. At extra active (1.9), his TDEE is approximately 3,580 calories. If he fuels at only 2,500 calories, he will lose weight rapidly -- which could cost him muscle and performance at the worst possible time.

Reference Table

When to Use This Calculator

• Setting up any diet for the first time -- TDEE is the single number you need before deciding how much to eat; without it, any calorie target is an uninformed guess
• Diagnosing a weight loss plateau -- if your deficit stopped producing results, recalculate TDEE at your new, lower body weight; your maintenance has likely dropped 100-200 calories since you started
• Planning a muscle-building phase -- establish your true maintenance before adding a 300-500 calorie surplus; eating in a surplus without knowing your baseline often leads to much larger fat gains than expected
• Adjusting for seasonal activity changes -- a person who plays a recreational sport during spring and summer may need to step down their activity multiplier and reduce calories in the off-season to avoid slow fat gain
• Evaluating how much exercise actually matters -- the calculator shows the calorie difference between your current activity level and the next tier up, which helps you decide whether adding exercise or reducing food intake is more practical for your goal

Common Mistakes to Avoid

1. Choosing an activity level that is too high. Most people who work desk jobs and go to the gym 3-4 times per week are "lightly active," not "moderately active." The moderate multiplier assumes exercise 3-5 days per week at genuine effort, not 30-minute casual walks. Overestimating your activity multiplier inflates your TDEE by 200-350 calories and will cause fat gain if you eat to that number during a maintenance phase.

2. Not updating TDEE after significant weight change. Your TDEE changes as your body composition changes. Losing 15 lbs drops your maintenance by approximately 100-150 calories. If you started a diet at 220 lbs and are now at 195 lbs but still eating the same deficit, you may have eaten away much of it. Recalculate every 10-15 lbs of weight change.

3. Treating TDEE as an exact number. The Mifflin-St Jeor equation has a margin of error of roughly 10% for most people. Your actual TDEE might be 200-300 calories above or below the estimate due to genetics, hormone levels, gut health, and daily non-exercise movement (NEAT). Use it as a starting point and adjust based on 2-3 weeks of real weight data.

4. Confusing BMR with TDEE. BMR is your resting energy expenditure only. Eating at BMR means you are in a significant deficit regardless of activity level, which leads to muscle loss and metabolic slowdown over time. Always use TDEE -- not BMR -- as your reference point for calorie planning.

Understanding Your Results

Your BMR represents the minimum calories your body needs to survive at complete rest. Your TDEE is the number that actually matters for daily life -- it includes exercise, the energy cost of digesting food (thermic effect, roughly 10% of total calories), and all non-exercise movement.

Use TDEE as your anchor. To lose fat, eat 250-500 calories below it. To gain muscle with minimal fat, eat 250-500 calories above it. To maintain weight, eat at it. If your weight is not behaving as expected after 3 weeks of consistent eating, adjust by 100-200 calories in the appropriate direction rather than making a large correction.

If you notice your TDEE result seems unusually low (under 1,400 calories at normal activity levels), or if your weight is changing significantly despite eating at what appears to be maintenance, consult a healthcare provider -- thyroid issues and other metabolic conditions can significantly affect real-world TDEE.

Tips

1. Use TDEE as a starting point and adjust by 100-150 calories based on real weight trends after 2-3 weeks -- do not make large changes without data
2. Subtract 500 calories from TDEE for approximately 1 lb of fat loss per week; subtract 250 for a slower, more sustainable 0.5 lb/week
3. Pair this calculator with the Macro Calculator to convert your TDEE into specific protein, carb, and fat targets
4. NEAT -- non-exercise activity thermogenesis (walking, fidgeting, standing) -- can account for 200-800 calories per day and is highly variable; more daily movement outside the gym adds up significantly over weeks
5. Recalculate after every 10-15 lbs of weight change to keep your deficit or surplus accurate
6. Resistance training raises BMR over time by increasing lean mass -- this is the most durable way to increase your TDEE without relying on more cardio