VitalMetricHubBMR calculator
Basal metabolic rate is the energy you would burn at rest in 24 hours. We use the Mifflin–St Jeor equation, which tends to outperform older Harris–Benedict estimates in modern cohorts.
Estimated BMR
1370
kcal / day
How this BMR estimate changes with age (same formula)
Holding your current height, weight, and sex fixed, the Mifflin–St Jeor equation predicts lower BMR as age increases. This is not a population average curve. Educational illustration only — not a diagnosis or personal target.
Mifflin MD, St Jeor ST, et al. Am J Clin Nutr. 1990.
Go deeper
Evidence-informed guides tied to this calculator — still educational, not personal medical advice.
How this calculator works
Open any section below for the underlying method, how to read your results, practical tips, and limits. This site is for education only—not medical advice or a personal care plan.
Formula and method
We estimate BMR with the Mifflin–St Jeor equation using your sex, age, weight, and height. It predicts resting energy needs in kilocalories per day under standardized “at rest” assumptions.
Your true resting metabolism can differ because of genetics, thyroid disease, medications, stress, sleep, and body composition.
How to read your result
BMR is the bottom layer of your energy budget—the calories you would need to run organs and basic functions before intentional movement.
It is not your total daily calorie need. For maintenance calories in real life, use TDEE (BMR plus activity) or discuss targets with a registered dietitian.
Practical tips
Use recent weight; large fluid shifts can skew short-term readings.
If you are pregnant, breastfeeding, or under medical supervision for eating or endocrine disorders, treat any number as illustrative only.
Compare changes over time with the same equation and inputs rather than jumping between different apps that use different formulas.
Limitations
All predictive equations have error. Clinical indirect calorimetry is more accurate when available.
This calculator does not replace medical nutrition therapy or prescriptions for weight change.
Sources, formulas & further reading
Based on: Mifflin–St Jeor basal metabolic rate equation (1990).
For additional clinical context, see independent references from the publishers below (WHO, CDC, PubMed, Medscape, ACE, ACOG, NIH, NCBI, USDA — as applicable).
- PubMed — Mifflin–St Jeor (1990) — PubMed
- Medscape — Basal metabolic rate overview — Medscape
Medical disclaimer
This tool is for informational and educational purposes only. It does not constitute medical advice, diagnosis, or treatment. Always consult your doctor or qualified healthcare professional before making any health-related decisions. Results are estimates only.
Last medically reviewed: March 2026
Content last updated: March 30, 2026