Key Takeaway
Your Total Daily Energy Expenditure) or TDEE (is the number of calories your body burns in a full day. This TDEE calculator weight management resource covers the important information you need to make informed decisions.
Your Total Daily Energy Expenditure) or TDEE (is the number of calories your body burns in a full day. This TDEE calculator weight management resource covers the important information you need to make informed decisions. Knowing this number gives you a clear target for your weight management strategy while on GLP-1 medication. Eat below your TDEE and you lose weight. Eat at your TDEE and you maintain. It's the foundation of every successful weight management plan.
Key Takeaways: - Understand what makes up your tdee - Learn how to calculate your tdee - Learn how glp-1 medications affect your tdee - When and How to Recalculate
This guide shows you how to calculate your TDEE, what it means for your GLP-1 protocol, and how to adjust it as your body changes.
What Makes Up Your TDEE
Your body burns calories through three main pathways. Understanding each one helps you see where your energy actually goes.
Basal Metabolic Rate (BMR)) 60-70% of TDEE. This is the energy your body uses just to exist. Breathing, pumping blood, maintaining body temperature, repairing cells (it all costs calories. Your BMR is influenced by your age, sex, height, weight, and body composition. More muscle means a higher BMR.
Thermic Effect of Food (TEF)) about 10% of TDEE. Digesting food requires energy. Protein has the highest thermic effect at 20-30%, meaning your body uses 20-30% of protein calories just to process them. Carbohydrates and fats have lower thermic effects (5-15% and 0-5% respectively). This is one more reason to prioritize protein on GLP-1 treatment.
Physical Activity (20-30% of TDEE. This includes both structured exercise and non-exercise activity thermogenesis (NEAT). NEAT is the energy you burn from daily movements like walking, fidgeting, standing, and doing household chores. NEAT can vary by hundreds of calories between active and sedentary people.
When you start GLP-1 medication, your TDEE may shift. As you lose weight, your BMR decreases because there's less body mass to maintain. Some research also suggests that significant weight loss can reduce NEAT) your body subconsciously moves less to conserve energy.
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This is why recalculating your TDEE periodically matters. Learn more about building an eating plan around your numbers in our .
How to Calculate Your TDEE
The most widely validated formula for estimating BMR is the Mifflin-St Jeor equation.
View data table
| Category | Mean Body Weight Loss (%) | Detail |
|---|---|---|
| Tirzepatide | 22 | ~22% body weight at 72 wks |
| Semaglutide | 15 | ~15% body weight at 68 wks |
| Liraglutide | 8 | ~8% body weight at 56 wks |
| Retatrutide | 24 | ~24% in Phase 2 trial |
Men: BMR = (10 x weight in kg) + (6.25 x height in cm) - (5 x age in years) + 5
Women: BMR = (10 x weight in kg) + (6.25 x height in cm) - (5 x age in years) - 161
To convert pounds to kilograms, divide by 2.2. To convert inches to centimeters, multiply by 2.54.
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Next, multiply your BMR by an activity factor:
| Activity Level | Multiplier | Description |
|---|---|---|
| Sedentary | 1.2 | Desk job, little exercise |
| Lightly active | 1.375 | Light exercise 1-3 days/week |
| Moderately active | 1.55 | Moderate exercise 3-5 days/week |
| Very active | 1.725 | Hard exercise 6-7 days/week |
| Extra active | 1.9 | Very hard exercise, physical job |
Example: A 45-year-old woman, 5'5" (165 cm), 220 lbs (100 kg), moderately active.
BMR = (10 x 100) + (6.25 x 165) - (5 x 45) - 161 = 1,000 + 1,031 - 225 - 161 = 1,645 calories
TDEE = 1,645 x 1.55 = 2,550 calories per day
For weight loss, she'd subtract 500-750 calories, targeting about 1,800-2,050 calories daily. On GLP-1 medication, her natural appetite reduction may bring her close to this range automatically.
How GLP-1 Medications Affect Your TDEE
GLP-1 medications don't directly change your TDEE. They don't speed up your metabolism or increase calorie burn. Instead, they work by reducing the "calories in" side of the equation through appetite suppression.
Check your GLP-1 eligibility
Use our free BMI Calculator to see if you may qualify for provider-reviewed GLP-1 therapy.
Try the BMI Calculator →But several indirect effects can influence your TDEE during treatment:
Weight loss reduces BMR. For every 10 pounds of weight lost, BMR decreases by roughly 50-70 calories per day. Over 50 pounds of weight loss, that's a 250-350 calorie reduction in your daily burn. This is why weight loss slows over time) the deficit naturally closes.
Muscle loss affects BMR further. If you lose significant muscle mass during weight loss, your BMR drops even more. This is why resistance training and adequate protein are so important. They help preserve the metabolically active tissue that keeps your BMR higher. See our for targets.
Activity levels may change. Some people become more active as they lose weight (they have more energy and mobility. Others may unconsciously reduce NEAT. Tracking your steps and activity with the helps you monitor this.
Thermic effect of food may drop. If you're eating significantly fewer calories, the absolute amount of energy used for digestion decreases too.
When and How to Recalculate
Your TDEE isn't static. Here's when to recalculate and what to adjust.
Recalculate every 15-20 pounds of weight loss. Update your weight in the formula to get your new BMR and TDEE. This keeps your calorie target appropriate for your current body size.
Recalculate when your activity level changes. If you start a new exercise program or become more sedentary (injury, job change), adjust your activity multiplier.
Recalculate at each titration step. While the medication itself doesn't change your TDEE, your eating patterns may shift at each dose level. Awareness of your TDEE helps you evaluate if you're eating enough.
Watch for signs of too-large a deficit. If your TDEE is 2,200 calories but you're only eating 1,000, that's a 1,200-calorie deficit) more aggressive than recommended for most people. Signs of too-large a deficit include persistent fatigue, hair loss, poor sleep, and loss of menstrual period. Review our for more warning signs.
Share your numbers with your provider. Bringing your calculated TDEE and your typical daily intake to your helps your provider assess whether your nutrition supports your treatment goals.
Frequently Asked Questions
Is TDEE the same as BMR?
No. BMR is the calories your body burns at complete rest (just to keep you alive. TDEE includes BMR plus the calories burned through digestion and all physical activity. TDEE is always higher than BMR. For weight management purposes, TDEE is the more useful number because it represents your total daily calorie burn.
How accurate are TDEE calculators?
TDEE calculators provide estimates with roughly 10-15% accuracy for most people. They use population-based formulas that may not perfectly match your individual metabolism. Use the calculated number as a starting point, then adjust based on your actual results over 2-4 weeks.
Should I eat at my TDEE on rest days and below it on workout days?
For most GLP-1 patients, keeping your calorie target consistent day to day is simpler and equally effective. Your body doesn't reset its energy balance every 24 hours) it works on averages over time. If you prefer varying your intake, slightly higher calories on workout days and slightly lower on rest days can work, but the total weekly intake matters more than daily fluctuations.
Does my TDEE change with age?
Yes. BMR decreases by approximately 1-2% per decade after age 20. This is partly due to age-related muscle loss (sarcopenia). Resistance training can slow this decline by maintaining lean muscle mass, which directly supports a higher BMR.
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Medical References
- Davies M, Færch L, Jeppesen OK, et al. Semaglutide 2.4 mg once a week in adults with overweight or obesity, and type 2 diabetes (STEP 2). Lancet. 2021;397(10278):971-984. [PubMed | ClinicalTrials.gov | DOI]
- Wadden TA, Bailey TS, Billings LK, et al. Effect of Subcutaneous Semaglutide vs Placebo as an Adjunct to Intensive Behavioral Therapy on Body Weight in Adults With Overweight or Obesity (STEP 3). JAMA. 2021;325(14):1403-1413. [PubMed | ClinicalTrials.gov | DOI]
- Garvey WT, Batterham RL, Bhatt DL, et al. Two-year effects of semaglutide in adults with overweight or obesity (STEP 5). Nat Med. 2022;28(10):2083-2091. [PubMed | ClinicalTrials.gov | DOI]
Sources &. References
- Stierman B, Afful J, Carroll MD, et al. National Health and Nutrition Examination Survey 2017-March 2020 Prepandemic Data Files. NCHS Data Brief. No. 492. CDC/NCHS. 2023.
- Sumithran P, Prendergast LA, Delbridge E, et al. Long-Term Persistence of Hormonal Adaptations to Weight Loss. N Engl J Med. 2011;365(17):1597-1604. Doi:10.1056/NEJMoa1105816
- Wilding JPH, Batterham RL, Calanna S, et al. Once-Weekly Semaglutide in Adults with Overweight or Obesity. N Engl J Med. 2021;384(11):989-1002. Doi:10.1056/NEJMoa2032183
- Davies M, Færch L, Jeppesen OK, et al. Semaglutide 2.4 mg once a week in adults with overweight or obesity, and type 2 diabetes (STEP 2 (Davies et al., Lancet, 2021)). Lancet. 2021;397(10278):971-984. Doi:10.1016/S0140-6736(21)00213-0
- Wadden TA, Bailey TS, Billings LK, et al. Effect of Subcutaneous Semaglutide vs Placebo as an Adjunct to Intensive Behavioral Therapy on Body Weight in Adults With Overweight or Obesity (STEP 3 (Wadden et al., JAMA, 2021)). JAMA. 2021;325(14):1403-1413. Doi:10.1001/jama.2021.1831
- Garvey WT, Batterham RL, Bhatt DL, et al. Two-Year Effects of Semaglutide in Adults with Overweight or Obesity (STEP 5 (Garvey et al., Nat Med, 2022)). Nat Med. 2022;28:2083-2091. Doi:10.1038/s41591-022-02026-4
- Lincoff AM, Brown-Frandsen K, Colhoun HM, et al. Semaglutide and Cardiovascular Outcomes in Obesity without Diabetes. N Engl J Med. 2023;389(24):2221-2232. Doi:10.1056/NEJMoa2307563
This article is for educational purposes only and doesn't constitute medical advice. Always consult with a licensed healthcare provider before starting, changing, or stopping any medication or supplement. FormBlends connects you with licensed providers who can evaluate your individual health needs.
Last updated: 2026-03-24
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