BMR Calculator
Estimate basal metabolic rate (BMR) with standard resting-energy equations.
Common lower-middle resting-energy band.
| Equation | BMR (kcal/day) |
|---|---|
| Mifflin-St Jeor | 1757 |
| Revised Harris-Benedict | 1836 |
BMR per kg Interpretation
This view normalizes resting energy by body mass to make output easier to compare.
| RANGE | CATEGORY |
|---|---|
| 0-18 | Very Low Lower resting-energy output relative to body mass. |
| 18-22 | Low to Moderate Common lower-middle resting-energy band. |
| 22-26 | Typical Typical resting-energy output per kg for many adults. |
| 26-30 | Elevated Higher resting-energy output relative to body mass. |
| 30+ | High Very high resting-energy output per kg body mass. |
What This BMR Calculator Estimates
BMR is estimated energy use at rest before daily movement and planned exercise are added.
How BMR Relates to TDEE
BMR is not maintenance calories. To estimate maintenance, multiply by activity level in the TDEE Calculator. From there, build a practical intake with the Calorie Deficit Calculator.
Why BMR Is an Estimate
True resting expenditure varies with age, lean mass, hormones, medications, illness, and sleep. Use equation output as a starting point and calibrate from trend data over time.
References
- Mifflin-St Jeor resting energy equation (PubMed):A New Predictive Equation for Resting Energy Expenditure
- Revised Harris-Benedict equation (PubMed):The Harris Benedict Equation Reevaluated
- NIDDK adult weight-management guidance:NIDDK Adult Overweight and Obesity
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