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BMI Calculator

Calculate BMI with metric or imperial units, see healthy weight range, optional waist-to-height ratio context, and save/export progress snapshots.

Metric (kg, cm)Imperial (lb, in)

Weight (kg)Height (cm)Age (optional)Waist (cm, optional)

BMI22.9Normal

Healthy target range56.66-76.26 kgWithin target range

Additional metricsBMI Prime: 0.91Add waist measurement for waist-to-height context

018.525303540+

Range	Category	Context
0-18.4	Underweight	Potential nutrition deficit risk
18.5-24.9	Normal	Typical healthy range
25-29.9	Overweight	Elevated cardiometabolic risk
30-34.9	Obesity class I	High risk category
35-39.9	Obesity class II	Very high risk category
40+	Obesity class III	Severe risk category

No snapshots yet. Save a valid result to start tracking trend data.

Select metric or imperial units. Switching units auto-converts current values.
Enter weight and height, then optionally add age and waist for extra context.
Review BMI category and healthy range, then save/export snapshots for trend tracking.

BMI is a screening metric and not a direct body-fat measurement.
Children, pregnancy, athletes, and clinical conditions may require alternative assessment methods.
Use repeated measurements over time to understand directional change.

Healthy target range is derived from BMI 18.5 to 24.9 using your height.
BMI Prime is BMI divided by 25 and can be used as a normalized comparison.
Waist-to-height ratio is optional context and does not replace medical evaluation.

Does changing units convert my inputs?: Yes. Existing weight, height, and waist values are converted when you switch unit systems.
Is data sent to a server?: No. All calculations and history tracking run locally in your browser.
Can this replace professional advice?: No. Use this as educational guidance and consult a clinician for diagnosis or care decisions.

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