Basal Metabolic Rate (BMR)
BMR is the number of calories your body needs at rest to maintain essential functions like breathing and circulation. Knowing this helps set realistic calorie goals based on your metabolism.
Calculators List
How does BMR change with age and lifestyle?
BMR naturally decreases as you age due to muscle loss, but staying active and maintaining muscle mass can slow this decline, helping to keep your metabolism more active.
Sample BMR Ranges (Approximate)
| Gender | Age Range | BMR (Calories/Day) | Moderate Activity | High Activity | Very High Activity |
|---|---|---|---|---|---|
| Female | 18-24 | 1200-1500 | 1800-2300 | 2200-2600 | 2400+ |
| Female | 25-35 | 1200-1500 | 1800-2200 | 2200-2600 | 2400+ |
| Female | 36-45 | 1150-1400 | 1750-2100 | 2100-2500 | 2300+ |
| Female | 46-55 | 1100-1350 | 1700-2000 | 2000-2400 | 2200+ |
| Male | 18-24 | 1600-2000 | 2400-3000 | 2700-3400 | 3000+ |
| Male | 25-35 | 1600-2000 | 2200-2700 | 2700-3300 | 3000+ |
| Male | 36-45 | 1500-1900 | 2100-2600 | 2600-3200 | 2900+ |
| Male | 46-55 | 1400-1800 | 2000-2500 | 2500-3100 | 2800+ |
How can I use BMR to set calorie goals?
Once you know your BMR, you can adjust your calorie intake based on activity level, helping set realistic goals for weight loss, muscle gain, or maintenance.
What factors other than age affect BMR?
Body composition, thyroid function, and genetics all influence BMR. For example, more muscle mass generally means a higher BMR.
Why shouldn’t I eat below my BMR calorie needs?
Consuming fewer calories than your BMR can reduce muscle mass, slow down metabolism, and increase the risk of nutrient deficiencies. Read more from Harvard Medical School.
For more on BMR and its relationship to TDEE, check out the American Council on Exercise.