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BMI Calculator

Q: How is the healthy weight range determined?

By reversing the BMI formula for a target BMI of 18.5 and 24.9, giving the minimum and maximum weight that falls within the “normal” category for your height.

Quickly determine your Body Mass Index using the World Health Organization classification. Enter your height and weight in either metric or imperial units to get your BMI score, see which category you fall into, and view the healthy weight range for your height. No personal data is ever uploaded or stored — the calculation happens instantly on your device.

🔒 Processing happens in your browser — files are never uploadedFree · No sign-up required

How to Use

1Choose your preferred unit system (metric or imperial).
2Enter your weight and height in the corresponding fields.
3Instantly view your BMI value, its classification, and your recommended healthy weight range.

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Why use ShowPro's BMI Calculator?

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100% Private

Files never leave your browser. Zero server uploads.

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Instant Results

Processing happens locally — no waiting for uploads.

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Completely Free

No account needed. Use 5 times per day, always free.

Frequently Asked Questions

Is my health data sent to a server?

No. The entire calculation runs in your browser. Your height and weight are never transmitted, stored, or logged.

What BMI categories are used?

We follow the WHO standard: <18.5 (underweight), 18.5–24.9 (normal), 25–29.9 (overweight), ≥30 (obese).

How is the healthy weight range determined?

By reversing the BMI formula for a target BMI of 18.5 and 24.9, giving the minimum and maximum weight that falls within the “normal” category for your height.