How stable is this BMI measurement?
This route focuses on measurement quality: compare repeat height and weight readings and see the actual BMI interval produced by the readings you entered. It does not invent a universal device tolerance.
BMI is not a diagnosis. It does not directly measure body fat, fitness, nutrition or health. It may be less informative for pregnancy, some disabilities, oedema, high muscularity and some body compositions. Children and teenagers require age- and sex-specific growth assessment.
Measurement summary
Enter your measurements to calculate an adult BMI and observed repeat-reading range.
Why this is separate from the standard calculator
The standard tool at /tools/bmi-calculator/ supports quick metric and imperial conversion with a conventional adult screening band. This health worksheet instead shows whether repeat measurements change the displayed number before anyone interprets it.
Official sources, reviewed 26 July 2026: CDC BMI frequently asked questions (28 June 2024); WHO STEPS physical-measurement instrument; WHO obesity and overweight fact sheet. Formula: kg ÷ metres².