General estimate
BMI Calculator
Estimates weight relative to height. It does not measure body composition.
How this estimate is calculated
Weight in kilograms divided by height in metres squared.
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
BMI does not distinguish muscle from fat, or where fat sits on the body. It was designed to describe populations, not to assess an individual. Athletes, older adults, pregnant people and some ethnic groups sit differently against the standard cut-offs.
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.