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ToolNest AI
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BMI Calculator

Calculate your Body Mass Index and understand your health category.

Unit System

Enter your height and weight to calculate BMI

BMI Categories

Underweight< 18.5
Normal18.5 – 24.9
Overweight25 – 29.9
Obese≥ 30

* BMI is a screening tool, not a diagnostic measure. Consult a healthcare professional for medical advice.

About BMI Calculator

Enter your height and weight to instantly calculate your BMI. Results include your BMI value, health category (Underweight, Normal, Overweight, Obese), and context for what the number means for your health.

Frequently Asked Questions

A BMI between 18.5 and 24.9 is considered normal/healthy. Under 18.5 is underweight, 25–29.9 is overweight, and 30+ is considered obese.

Yes, you can enter height and weight in either metric (cm/kg) or imperial (ft/in/lbs) units.

BMI is a useful screening tool but has limitations — it does not account for muscle mass, bone density, or fat distribution. Consult a healthcare provider for a full health assessment.

No. All calculations happen locally in your browser. No personal health data is ever sent to our servers.

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