BMR is the energy your body uses just to stay alive at complete rest. TDEE is everything you burn in a real day, including movement. TDEE is built on top of BMR — and it's TDEE you use for calorie planning.
BMR: the baseline
Your Basal Metabolic Rate is what you'd burn lying still all day — powering your heart, brain, breathing and cell repair. It's the floor. For most people it's the single largest chunk of daily energy use, often 60–70% of the total.
TDEE: the full picture
Your Total Daily Energy Expenditure takes your BMR and multiplies it by an activity factor to account for everything else:
- Everyday movement and exercise
- The energy cost of digesting food
- Fidgeting and non-exercise activity
| Activity level | Rough multiplier on BMR |
|---|---|
| Sedentary (desk job, little exercise) | × 1.2 |
| Lightly active (1–3 days/week) | × 1.375 |
| Moderately active (3–5 days/week) | × 1.55 |
| Very active (6–7 days/week) | × 1.725 |
| Extremely active (physical job + training) | × 1.9 |
How they work together
Calculate your BMR first (the Mifflin-St Jeor equation is the standard), then apply your activity multiplier to get TDEE, then add or subtract calories for your goal. Our BMR calculator does the first step and explains how to take it to TDEE.
The activity multipliers explained
The bridge between your BMR and your TDEE is an activity multiplier — a number that scales up your resting burn to account for how much you move. A sedentary person multiplies their BMR by roughly 1.2, while someone lightly active (light exercise a few days a week) uses about 1.375, moderately active around 1.55, very active around 1.725, and extremely active (hard daily training or a physical job) up to about 1.9. Choosing the right multiplier honestly is the key to an accurate TDEE, and most people tend to overestimate their activity, which inflates their calorie target.
Which number should you actually use?
For day-to-day decisions about eating, your TDEE is the number that matters, because it reflects the calories you truly burn in a full day. Your BMR is best understood as the floor beneath it — useful for knowing the minimum your body needs, but not a target to eat toward. When people set weight-loss or weight-gain goals, they should adjust from their TDEE, never from their BMR.
How to use these numbers for your goal
Once you know your TDEE, your goal decides the adjustment. To lose weight, eat below your TDEE — a deficit of about 500 calories a day is a common, sustainable choice. To gain muscle, eat modestly above it. To maintain, eat at it. Recalculate every so often, because as your weight and activity change, so do both your BMR and TDEE.
Frequently asked questions
Should I eat my BMR or my TDEE?
Base your eating on your TDEE, not your BMR. Your TDEE reflects the calories you actually burn in a day, while your BMR is just the resting minimum and shouldn't be used as a calorie target.
How do I calculate my TDEE?
Work out your BMR, then multiply it by an activity factor for how active you are. Our calorie (TDEE) calculator does both steps for you.
Does my TDEE change over time?
Yes. As your weight, muscle mass, age and activity level change, both your BMR and TDEE shift, so it's worth recalculating periodically.
This article is general information, not financial, tax, or medical advice. See our disclaimer.