Health
About BMI Calculator
Use this free BMI calculator to estimate body mass index from height and weight with metric or US units.
Tool details and FAQUse cases, limits, privacy, and related tools
Overview
Calculate body mass index from height and weight in your browser. The BMI calculator is useful for a quick general screening number, but it is not a medical diagnosis.
Best for
- Quick BMI checks with metric or US height and weight units.
- Estimating a general body mass index category.
- Simple browser-based health reference calculations.
Not for
- Medical diagnosis, treatment, or personal health advice.
- Assessing children, athletes, pregnancy, body composition, or individual health risk without a clinician.
How it works
- Choose the unit system.
- Enter height and weight.
- Review the BMI value and general category.
Limits and privacy
BMI is a broad screening measure. It does not directly measure body fat, muscle mass, age-specific risk, pregnancy status, or individual medical context.
Common uses
- Calculate body mass index from metric or US measurements.
- Check a general BMI category for reference.
- Compare height and weight examples without uploading personal data.
Useful facts
- Tiny Work Tools BMI Calculator runs locally in the browser.
- BMI is a population-level screening metric and should not replace professional medical guidance.
FAQ
What is BMI?
BMI, or body mass index, is a height-to-weight calculation often used as a broad screening reference.
Does BMI diagnose health?
No. BMI does not diagnose health or body composition. It is only a general screening number.
Can I use metric and US units?
Yes. The calculator supports common metric and US height and weight inputs.