What is TDEE and why does it matter for weight loss?
Original EKCal illustration.
If you've ever felt confused about how many calories to eat, the missing piece is a single number: your TDEE. Understanding it transforms guesswork into a clear, actionable plan.
Calculate your TDEE
Estimate BMR, maintenance calories and a realistic range.
Open the free calculator →What does TDEE stand for?
TDEE stands for Total Daily Energy Expenditure — the total number of calories your body burns in a full day, accounting for everything from breathing to exercise. It's your calorie break-even point. Eat at your TDEE and your weight stays stable. Eat below it and you lose weight. Eat above it and you gain.
📌 Simple rule: TDEE = all the calories you burn in a day. Eat less than this to lose weight.
What makes up your TDEE?
Your TDEE has four components:
- BMR (Basal Metabolic Rate) — calories burned just staying alive at rest: heart beating, lungs breathing, organs functioning. This is 60–70% of your total.
- Physical activity — intentional exercise like runs, gym sessions, sports.
- NEAT — Non-Exercise Activity Thermogenesis: walking, standing, fidgeting, housework. Varies hugely between people.
- TEF — Thermic Effect of Food: calories burned digesting meals. Protein has the highest TEF at ~25%.
How is TDEE calculated?
Step 1: Calculate BMR using the Mifflin-St Jeor equation (the most validated formula for healthy adults).
- Men: BMR = (10 × weight kg) + (6.25 × height cm) − (5 × age) + 5
- Women: BMR = (10 × weight kg) + (6.25 × height cm) − (5 × age) − 161
Step 2: Multiply by your activity factor — from 1.2 (sedentary) to 1.9 (very active). The result is your TDEE.
Find your personalised TDEE in under 30 seconds — free, no sign-up.
Use the free TDEE Calculator →How to use your TDEE for weight loss
- To lose fat: eat 300–500 kcal below TDEE → ~0.3–0.5 kg loss per week
- To maintain: eat at your TDEE
- To build muscle: eat 200–300 kcal above TDEE with high protein
Does TDEE change over time?
Yes. As you lose weight, your BMR drops because you have less body mass to maintain. Recalculate your TDEE every 4–6 weeks, or whenever your weight changes by 3–4 kg. Ignoring this is the most common reason weight loss stalls.
Key takeaways
- TDEE is the total calories you burn in a day including all activity.
- It's calculated from your BMR multiplied by your activity factor.
- Eating below TDEE causes weight loss; above it causes weight gain.
- A deficit of 300–500 kcal/day is the most sustainable approach for most people.
- Recalculate your TDEE every 4–6 weeks as your weight changes.
Why TDEE changes
TDEE is not a permanent personal constant. It changes with body weight, activity, occupation, training, illness, pregnancy and even seasonal routines. A calculator cannot see spontaneous movement or how much you actually move at work.
Re-estimate after a meaningful weight change or major lifestyle change, then verify against your real trend.
A practical calibration method
- Use the calculator estimate.
- Eat near that number consistently for two to four weeks.
- Track weekly average weight.
- If weight is stable, the estimate is close to maintenance.
- If weight changes, adjust the estimate in the direction shown by the trend.
A simple way to put this into practice
- Choose one measurable behavior for the next seven days.
- Keep the rest of your routine reasonably stable.
- Review weekly averages rather than one-day results.
- Adjust only after you have enough information.
Sources and evidence base
- National Institute of Diabetes and Digestive and Kidney Diseases — Weight Management
- Centers for Disease Control and Prevention — Healthy Weight and Growth
- Physical Activity Guidelines for Americans
- USDA FoodData Central
References support general principles; they do not make EKCal a substitute for clinical care. See our Editorial Policy and Sources & Methodology.