General estimate
BMR Calculator
Estimates energy used at rest with the Mifflin–St Jeor equation.
How this estimate is calculated
The Mifflin–St Jeor equation: (10 × weight) + (6.25 × height) − (5 × age), then +5 for male or −161 for female inputs.
How to use the result
Treat it as a starting point to compare against how you actually feel and what you actually eat. Estimates are most useful for spotting a large gap, not for chasing a precise number.
What this cannot tell you
Resting energy varies by roughly 10% between people of the same size and age. Thyroid conditions, medication and body composition all shift the real figure.
Estimates, not measurements: this tool runs a population equation, so it describes a typical person with your inputs rather than measuring you. Where a number drives a decision about a diagnosed condition or medication, have a dietitian or clinician sanity-check it against your history.