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Key detailsAbout this tool
BMR Calculator
Estimate BMR with the Mifflin–St Jeor or Revised Harris–Benedict equation and compare it with an activity-adjusted daily energy estimate.
Learn what basal metabolic rate means, how common equations estimate it, and how activity changes the daily energy requirement.
What BMR means
Basal metabolic rate is an estimate of the energy the body would use at rest under standardized conditions. It is not the same as total daily calorie expenditure.
Mifflin–St Jeor
The calculator can use the Mifflin–St Jeor equation, which estimates resting energy needs from weight, height, age and sex.
Revised Harris–Benedict
The revised Harris–Benedict equation provides another mathematical estimate. Different equations can produce different results for the same person.
From BMR to daily needs
Multiplying BMR by an activity factor produces an estimated daily energy requirement. The activity factor is a broad assumption, not a wearable-device measurement.
How to use it
Compare the estimate with actual weight and energy trends over several weeks and adjust assumptions if your real-world results consistently differ.
Health note
BMR calculations are educational estimates and do not diagnose metabolic disorders.
Related Health Tools
Explore related Tervilo calculators for a broader view of the same topic.
Questions & Answers
Frequently Asked Questions
What does the BMR Calculator calculate?
It provides an estimate from the inputs you enter. Review the detailed guide on this page for formulas, interpretation, assumptions and limitations.
What is the difference between BMR and daily calorie needs?
BMR is a resting-energy estimate. Daily calorie needs are higher because they also account for normal movement and activity through an activity factor.
Which BMR formula should I use?
Both are established mathematical equations. Mifflin–St Jeor is commonly used in modern calorie-estimation contexts, while Revised Harris–Benedict is provided as a comparison.
Are BMR calculator results exact?
No. BMR equations estimate resting energy from a small set of inputs and cannot measure an individual metabolism directly.