Is My BMR Normal?
One of the most common questions we hear is: "Is my BMR normal?" The short answer is that BMR varies enormously between individuals, but there are typical ranges by age and gender. Comparing your number to these ranges can tell you whether your metabolism is in a healthy ballpark.
Calculate yours first with our BMR calculator, then check the tables below.
Average BMR Ranges by Age and Gender
These ranges are based on adults at a healthy weight using the Mifflin-St Jeor formula. Your actual BMR may vary based on body composition and muscle mass.
| Age Range | Female (kcal/day) | Male (kcal/day) | Notes |
|---|---|---|---|
| 18–25 | 1,400 – 1,600 | 1,700 – 2,000 | Peak metabolic rate |
| 26–35 | 1,350 – 1,550 | 1,650 – 1,950 | Stable metabolism |
| 36–45 | 1,300 – 1,500 | 1,600 – 1,900 | Gradual decline begins |
| 46–55 | 1,250 – 1,450 | 1,550 – 1,850 | Muscle loss accelerates |
| 56–65 | 1,200 – 1,400 | 1,500 – 1,800 | Sarcopenia risk rises |
| 65+ | 1,150 – 1,350 | 1,450 – 1,750 | Maintain muscle mass |
Why BMR Decreases With Age
BMR drops about 1–2% per decade after age 30. The main culprit is sarcopenia — the age-related loss of muscle mass. Since muscle burns more calories at rest than fat, less muscle means a lower BMR.
Other factors include hormonal changes (lower testosterone and estrogen), reduced spontaneous activity, and changes in organ function. The good news? Resistance training can slow or even reverse this decline.
What If My BMR Is Below Normal?
A BMR below the typical range could be due to:
- Low muscle mass (fixable with strength training)
- Underactive thyroid (check with your doctor)
- Very low body weight
- Recent crash dieting (metabolic adaptation)
- Genetics
If your BMR seems unusually low and you have symptoms like fatigue or cold intolerance, consult a healthcare provider to check your thyroid function.
What If My BMR Is Above Normal?
A higher-than-average BMR is usually a good sign — it often means more muscle mass, a larger body frame, or an active lifestyle. It can also result from pregnancy, fever, or an overactive thyroid (hyperthyroidism).
Key Takeaway Don't obsess over comparing your BMR to averages. What matters most is tracking your own number over time and using it to make informed nutrition decisions.