BMR vs TDEE: What's the Difference, and Which Should You Use?
Side by side
🛌 BMR (Basal Metabolic Rate)
- Calories burned lying still all day
- Covers organs, breathing, circulation, brain
- ~60–70% of your total burn
- Changes slowly (body size, muscle, age)
- Use it as: a reference floor
🚶 TDEE (Total Daily Energy Expenditure)
- Calories burned in your real day
- BMR + digestion + daily movement + exercise
- 100% of your burn = your maintenance calories
- Changes day to day with activity
- Use it as: the number to plan your diet around
How they're connected
Same person, different lifestyles. Example: BMR of 1,600 kcal/day:
| Lifestyle | Factor | TDEE | Difference above BMR |
|---|---|---|---|
| Sedentary (desk job, no exercise) | 1.2 | 1,920 kcal | +320 |
| Lightly active | 1.375 | 2,200 kcal | +600 |
| Moderately active | 1.55 | 2,480 kcal | +880 |
| Very active | 1.725 | 2,760 kcal | +1,160 |
| Extremely active | 1.9 | 3,040 kcal | +1,440 |
That's why two people with the same BMR can need very different amounts of food.
Where should your calorie target sit?
very aggressive Between BMR & TDEE
fat-loss zone ≈ TDEE
maintain Above TDEE
gain
- Lose fat: eat 300–500 kcal below TDEE. For most people that's still above BMR. See how to calculate a calorie deficit.
- Maintain: eat around your TDEE.
- Build muscle: eat 200–300 kcal above TDEE with strength training.
- Below BMR: only short-term and ideally with professional guidance.
Worked example
Jess (29, female, 170 cm, 72 kg, lightly active) wants to lose weight.
- BMR = 10×72 + 6.25×170 − 5×29 − 161 = 720 + 1,062.5 − 145 − 161 = ~1,477 kcal
- TDEE = 1,477 × 1.375 = ~2,030 kcal
- Fat-loss target = 2,030 − 400 = ~1,630 kcal/day, safely between her BMR and TDEE ✅
Get both numbers at once
The TDEE Calculator shows your BMR, TDEE, and goal-based calorie targets.
→ Prefer just BMR? Use the BMR CalculatorCommon mistakes
- Eating "your BMR" to lose weight. It's usually an unnecessarily big deficit. Start from TDEE instead.
- Picking too high an activity level. Most people with desk jobs are "sedentary" or "lightly active" even if they work out a few times a week.
- Adding exercise calories on top of an "active" TDEE. That double-counts your workouts.
- Never recalculating. As you lose weight, both BMR and TDEE fall. Recalculate every ~5 kg (10 lb).
Frequently asked questions
What is the difference between BMR and TDEE?
BMR is the calories your body burns at complete rest to stay alive. TDEE is your total daily burn: BMR plus digestion, everyday movement, and exercise. TDEE is always higher than BMR, typically by 20–90% depending on how active you are.
Should I eat based on BMR or TDEE?
Base your eating on TDEE. TDEE is your maintenance level. To lose weight, eat a moderate amount below TDEE (for example 300–500 kcal less); to gain, eat slightly above it. BMR is useful mainly as a reference floor.
Is it bad to eat below my BMR?
Occasionally eating below BMR is not dangerous, but doing it for long periods is an aggressive deficit that can increase muscle loss, hunger, and nutrient shortfalls. Most people do better staying between BMR and TDEE when losing weight.
How much higher is TDEE than BMR?
TDEE equals BMR multiplied by an activity factor, usually between 1.2 (sedentary) and 1.9 (extremely active). So TDEE is roughly 20% higher than BMR for a sedentary person and up to about 90% higher for very active people.
Sources
- Mifflin MD, St Jeor ST, et al. A new predictive equation for resting energy expenditure in healthy individuals (Am J Clin Nutr, 1990)
- Frankenfield D, et al. Comparison of predictive equations for resting metabolic rate: a systematic review (J Am Diet Assoc, 2005)
- Levine JA. Non-exercise activity thermogenesis (NEAT) (2002)
- NIH / NIDDK Body Weight Planner
- Dietary Guidelines for Americans (estimated calorie needs)
This article is for general education and is not medical advice. Formulas give estimates; your actual needs may differ. Consult a qualified healthcare professional before making significant dietary changes. See our medical review policy and disclaimer.