Calculator comparison
BMR vs TDEE
BMR estimates energy used at rest; TDEE estimates the whole day. See how activity changes the answer and which figure belongs in calorie planning.
Updated 16 October 2026 • Tools by Layna Editorial Team • General information
Resting energy and daily energy are different totals
Basal metabolic rate (BMR) refers to energy used under strict resting conditions. Total daily energy expenditure (TDEE) includes resting needs, digestion and physical activity. Both are usually expressed in kilocalories per day (kcal/day).
The linked BMR calculator uses the Mifflin–St Jeor resting-energy equation, rather than a laboratory measurement of basal metabolism. The TDEE calculator multiplies that estimate by a selected activity factor. An activity multiplier is a modelling assumption, not a measurement of your actual day.
Compare the methods
| Question | BMR estimate | TDEE estimate |
|---|---|---|
| What goes in? | Weight, height, age and the equation’s sex coefficient | The resting-energy estimate plus an activity factor |
| What comes out? | Resting kcal/day | Estimated maintenance kcal/day |
| What is it useful for? | Understanding the resting part of energy needs | An initial daily calorie-planning estimate |
| What is missing? | Movement and the rest of daily energy use | Individual variation and changes in actual routine |
Worked example: 1,755 resting kcal becomes about 2,720 daily kcal
For a hypothetical 35-year-old man weighing 80 kg at 180 cm, the calculator’s equation is 10 × 80 + 6.25 × 180 − 5 × 35 + 5 = 1,755 kcal/day.
With a selected activity factor of 1.55, estimated TDEE is 1,755 × 1.55 = 2,720.25 kcal/day, displayed as about 2,720. The extra 965 kcal is the model’s allowance for the rest of the day; it is not a separate exercise target.
The same person selecting 1.2 would get 2,106 kcal/day. That difference shows why choosing an optimistic activity category can distort a food target.
Which number should guide the next step?
Use the TDEE estimate when asking “roughly how much energy maintains my weight with this routine?” Use BMR when examining the resting-energy part of that estimate. BMR alone does not establish a safe minimum intake or a weight-loss prescription.
If you already use an activity-adjusted TDEE, adding the same workouts again can double-count them. Review the estimate against a consistent routine and an appropriate longer-term trend. Adult weight-management estimates are not suitable for prescribing diets for children, pregnancy, breastfeeding or medical nutrition needs.
Use the relevant calculator
Frequently asked questions
Is BMR the number of calories I should eat?
No. It estimates resting energy and leaves out the rest of the day. It is not a personalized dietary prescription.
Why do two TDEE calculators disagree?
They can use different resting equations, activity factors or goal adjustments. Compare those assumptions before comparing the final numbers.
Should I add workout calories to TDEE?
Only if the original estimate excluded that activity. Adding exercise already represented by the activity factor counts it twice.
Sources and method
The worked figures are illustrative arithmetic. The references below explain the underlying definitions and limits.