Calculate your Body Mass Index, track it over time per person, and log optional health details — instantly, right in your browser.
Enter your height and weight, then calculate to see your BMI here.
| Date | BMI | Category | Weight | Height | Waist | Body Fat |
|---|
Based on World Health Organization (WHO) adult BMI classification.
| Category | BMI Range |
|---|---|
| Underweight | Below 18.5 |
| Healthy weight | 18.5 – 24.9 |
| Overweight | 25.0 – 29.9 |
| Obesity | 30.0 and above |
BMI is your weight in kilograms divided by the square of your height in meters (kg / m²). This tool converts imperial units automatically before doing the math.
No. Every user profile and every BMI entry is stored only in this browser's local storage on this device. Nothing is sent to or stored on our servers.
Yes. Use the user dropdown to add additional people, rename them, and switch between them. Each person's history, chart, and optional health details are kept completely separate.
No. Because data is stored locally, it stays on the device and browser where it was entered. Clearing your browser data will also remove it.
BMI is a useful screening tool but does not directly measure body fat and doesn't account for muscle mass, bone density, age, or sex. Use it alongside other measurements and consult a healthcare professional for a full picture.
Waist circumference, body fat percentage, activity level, and notes are optional extras you can log with each entry for a fuller picture over time. They are stored locally per person, the same as your BMI history.
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