⚖️BMI Calculator
Calculate Body Mass Index and category.
🆓 Free🔒 Secure⚡ Instant📱 Mobile-friendly🚫 No signup
Calculate your BMI (Body Mass Index) online for free. Find out if you are underweight, normal, or overweight.
How to Use BMI Calculator — Step by Step
- 1Enter your height (in cm or feet/inches) and weight (in kg or lbs)
- 2Click 'Calculate BMI' — your Body Mass Index is computed instantly
- 3Your BMI category is shown: Underweight, Normal, Overweight, or Obese
- 4View the healthy weight range for your height
Why Use ToolNest for BMI Calculator?
- ⚖️Supports both metric (kg/cm) and imperial (lbs/ft) inputs
- 📊Shows BMI category: Underweight, Normal, Overweight, or Obese
- 📏Displays healthy weight range for your height
- ⚡Instant calculation — no submit button needed
- 🆓Free — no signup required
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Frequently Asked Questions
What does BMI measure?
BMI (Body Mass Index) is a measure of body fat based on height and weight. It categorizes people into Underweight (<18.5), Normal (18.5-24.9), Overweight (25-29.9), and Obese (≥30).
Is BMI an accurate measure of health?
BMI is a useful screening tool but doesn't account for muscle mass, bone density, or body fat distribution. Athletes may have a high BMI despite being healthy. Use it as one of many health indicators.
What units does the calculator support?
Both metric (kg and cm) and imperial (lbs and feet/inches) are supported.
Is my data stored?
No. All calculations happen in your browser and no personal data is stored.