How to Calculate Your TDEE for Weight Loss (2026)

If you want to lose weight without guessing, the single most useful number you can know is your Total Daily Energy Expenditure, or TDEE. It tells you roughly how many calories your body burns in a day. Once you know that number, weight loss stops being a mystery and becomes simple math: eat fewer calories than you burn, and you lose fat over time. This guide walks you through exactly how to calculate it in 2026, and how to turn it into a calorie target you can actually follow.

What TDEE Actually Means

Your TDEE is made up of four parts. First is your Basal Metabolic Rate (BMR), the energy your body burns at complete rest just to keep you alive. Second is the energy used to digest food, called the thermic effect of food. Third is exercise activity. Fourth is everything else you do while awake, such as walking, fidgeting, and standing, known as non-exercise activity thermogenesis. Added together, these give you your TDEE.

The fastest way to get your number is to use a TDEE calculator, but understanding the math underneath helps you trust the result and adjust it intelligently.

Step 1: Calculate Your BMR With Mifflin-St Jeor

The most accurate widely used formula is the Mifflin-St Jeor equation. It uses your weight in kilograms, height in centimeters, and age in years.

• 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

For example, a 30-year-old woman who is 165 cm tall and weighs 70 kg would calculate: (10 x 70) + (6.25 x 165) - (5 x 30) - 161 = 700 + 1031.25 - 150 - 161 = roughly 1420 calories per day at rest.

Step 2: Apply Your Activity Multiplier

BMR alone is not your TDEE because you are not lying still all day. To get your real burn, multiply your BMR by an activity factor that matches your lifestyle.

• 1.2 sedentary, little or no exercise, desk job
• 1.375 lightly active, light exercise 1 to 3 days per week
• 1.55 moderately active, moderate exercise 3 to 5 days per week
• 1.725 very active, hard exercise 6 to 7 days per week
• 1.9 extra active, physical job plus hard daily training

Using our example woman with a BMR of 1420 and a moderately active lifestyle, her TDEE is 1420 x 1.55 = roughly 2200 calories per day. That is her maintenance level, the amount that keeps her weight stable.

Step 3: Create a Calorie Deficit

To lose weight you eat below your TDEE. One pound of fat stores roughly 3500 calories, so a daily deficit of 500 calories tends to produce about one pound of loss per week. A deficit of 750 to 1000 calories can push that toward 1.5 to 2 pounds, but larger deficits get harder to sustain and risk muscle loss.

• Mild loss (about 0.5 lb per week): TDEE minus 250
• Standard loss (about 1 lb per week): TDEE minus 500
• Aggressive loss (about 2 lb per week): TDEE minus 1000

For most people, a 15 to 25 percent reduction from TDEE is the sweet spot. Our example woman might target around 1700 calories for steady, manageable loss.

Step 4: Do Not Go Too Low

Very low calorie diets backfire. As a general rule, men should rarely eat below 1500 calories and women below 1200 without medical supervision. Eating too little slows your metabolism, drains your energy, and makes you more likely to binge. Slow and consistent beats fast and miserable.

Step 5: Track, Wait, Then Adjust

Numbers from any formula are estimates. Pick your target, eat at it consistently for two to three weeks, and track your weight every morning under the same conditions. If the scale trend is dropping at the rate you want, keep going. If nothing changes after three weeks, lower your intake by another 100 to 150 calories or add more daily steps. Your body adapts as you lose weight, so expect to recalculate your TDEE every 10 to 15 pounds.

Common Mistakes to Avoid

1. Overestimating activity level. Most people are closer to sedentary than they think. When in doubt, pick the lower multiplier.
2. Forgetting to count drinks, oils, and snacks. Liquid calories and cooking fats add up fast.
3. Weighing yourself once and panicking. Daily weight swings from water and food are normal. Watch the weekly trend.
4. Never recalculating. As your weight drops, your TDEE drops too, which is why progress stalls.

This article is general educational information, not medical advice. Talk to a doctor or registered dietitian before starting any diet, especially if you have a health condition.

Frequently Asked Questions