Is BMI medical advice?

No. BMI is a screening metric, not a diagnosis. For medical decisions, consult a qualified professional.

Why can BMI be misleading for athletes or older adults?

BMI does not distinguish muscle from fat and may not reflect body composition. It can misclassify muscular people or some older adults.

Which BMI categories does this tool use?

This tool uses common adult BMI cutoffs: underweight <18.5, normal 18.5–24.9, overweight 25–29.9, obesity ≥30.

BMI Calculator | Body Mass Index + Category + Healthy Range

Q: Does ONDO store my height/weight?

No. Calculations run locally in your browser. If you share a link, your inputs may be encoded in the URL.

Calculate

Tip: Use “Share” to reproduce the same inputs. Don’t share sensitive health info in URLs.

Units

Height (cm)

Weight (kg)

BMI

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How to use

Select units (Metric or Imperial).
Enter height and weight, then click Calculate BMI.
Use Copy result or Share to send the same inputs.

Notes

BMI is a screening metric and may not reflect body composition (muscle vs fat).
Adult categories here are common cutoffs; pediatric BMI uses age/sex percentiles.
Healthy range shown is a quick reference based on BMI 18.5–24.9.

Privacy & medical disclaimer

Local-only: Calculations run in your browser. ONDO does not store your inputs. If you share a link, height/weight may be encoded in the URL — avoid sharing sensitive info.

Read disclaimer

This tool is not medical advice and not a diagnosis.
For health decisions, consult a qualified healthcare professional.
Rounding and standards may differ; verify if needed.

FAQ

Why can BMI misclassify athletes?

BMI doesn’t separate muscle from fat, so muscular people can show a higher BMI.

Does ONDO store my height/weight?

No. Inputs are processed locally. “Share” may include your inputs in the URL.

Which BMI cutoffs are used?

Underweight <18.5, Normal 18.5–24.9, Overweight 25–29.9, Obesity ≥30 (common adult cutoffs).