TDEE vs BMR: What's the Difference and How to Use Them
By Calqpro Editorial Team · April 20, 2026 · 6 min read
Understanding how many calories your body actually burns is the foundation of any successful nutrition plan — whether your goal is fat loss, muscle gain, or simply maintenance. Two numbers matter most: BMR and TDEE.
What Is BMR?
BMR stands for Basal Metabolic Rate. It's the number of calories your body burns just to stay alive — breathing, circulation, cell production, temperature regulation — if you did nothing but lie in bed all day.
BMR is determined by:
- Height and weight (more mass = higher BMR)
- Age (BMR decreases ~2% per decade after 20)
- Sex (men generally have higher BMR due to more muscle mass)
- Genetics and thyroid function
What Is TDEE?
TDEE stands for Total Daily Energy Expenditure. It's your BMR multiplied by an activity factor — the total calories you burn in a real day, including exercise, work, and daily movement.
| Activity Level | Description | Multiplier |
|---|---|---|
| Sedentary | Desk job, little exercise | BMR × 1.2 |
| Lightly active | 1–3 days/week exercise | BMR × 1.375 |
| Moderately active | 3–5 days/week exercise | BMR × 1.55 |
| Very active | 6–7 days/week hard exercise | BMR × 1.725 |
| Extra active | Physical job + daily exercise | BMR × 1.9 |
How to Calculate BMR
The most accurate widely-used formula is the Mifflin-St Jeor equation (validated in multiple clinical studies):
Men: BMR = (10 × kg) + (6.25 × cm) − (5 × age) + 5
Women: BMR = (10 × kg) + (6.25 × cm) − (5 × age) − 161
Example: 30-year-old man, 180 lbs (81.6 kg), 5'10" (177.8 cm):
BMR = (10 × 81.6) + (6.25 × 177.8) − (5 × 30) + 5 = 816 + 1,111 − 150 + 5 = 1,782 calories/day
Using TDEE to Hit Your Goals
Once you know your TDEE, setting calorie targets becomes simple math:
- Lose fat: Eat 300–500 calories below TDEE. More than 500/day risks muscle loss.
- Maintain weight: Eat at TDEE.
- Gain muscle: Eat 200–300 calories above TDEE (lean bulk). More leads to excess fat gain.
Common Mistakes
- Overestimating activity level: Most people are "sedentary" or "lightly active" — honest self-assessment matters
- Eating at BMR: Eating only your BMR calories while being active creates too large a deficit and leads to muscle loss
- Not recalculating: As you lose weight, your BMR drops — recalculate every 10–15 lbs lost
- Ignoring NEAT: Non-exercise activity thermogenesis (fidgeting, walking, standing) can vary by 300–500 calories/day between people
Calculate Your BMR and TDEE
Get your precise numbers in seconds — then use them to set smart calorie targets for your goal.
Sources: Mifflin MD et al. (1990) — A new predictive equation for resting energy expenditure
Calqpro Editorial Team · Editorial Team · Calqpro