Is BMI accurate for everyone?

BMI is a general screening tool and may not accurately reflect health for athletes with high muscle mass or elderly individuals.

What is a healthy BMI range?

Generally, a BMI between 18.5 and 24.9 is considered the 'Normal' or healthy range for most adults.

Does this tool support imperial (pounds and inches)?

Yes. Switch between metric (kg/cm) and imperial (lb/in) with one click and the BMI is recalculated instantly.

What are the BMI categories?

The standard WHO categories are: Underweight (below 18.5), Normal weight (18.5–24.9), Overweight (25–29.9), and Obese (30 and above).

Is BMI an accurate measure of health?

BMI is a useful screening tool but does not account for muscle mass, bone density, or fat distribution. Consult a healthcare professional for a complete health assessment.

Can I use this BMI calculator for children?

Standard BMI ranges are calibrated for adults aged 20 and older. For children and teenagers, BMI is interpreted differently — it is plotted on age- and sex-specific growth charts as a BMI-for-age percentile rather than a fixed category like "overweight." This calculator displays the standard adult classification and is not designed for paediatric use. For children under 18, consult a paediatrician or use a dedicated BMI-for-age percentile calculator and always discuss results with a medical professional.

BMI Calculator — Metric & Imperial, Free Online Tool

About BMI Calculator

Get a simple assessment of your body weight relative to your height. Body Mass Index (BMI) is a widely used screening tool to categorize individuals and identify potential weight-related health risks.

How to Use

Enter your current weight and height into the corresponding fields.
The calculator will instantly display your BMI score.
Review your classification (Underweight, Normal, Overweight, or Obese).
Read the health disclaimers for important context on the result.

Common Use Cases

Tracking personal fitness goals and weight loss progress.
Getting a quick health screening as part of a wellness routine.
Understanding standard weight categories used by health organizations.

Technical Details

Calculates using the standard formula: BMI = weight(kg) / height(m)². All processing is local.

Frequently Asked Questions

Is BMI accurate for everyone?: BMI is a general screening tool and may not accurately reflect health for athletes with high muscle mass or elderly individuals.
What is a healthy BMI range?: Generally, a BMI between 18.5 and 24.9 is considered the 'Normal' or healthy range for most adults.
Does this tool support imperial (pounds and inches)?: Yes. Switch between metric (kg/cm) and imperial (lb/in) with one click and the BMI is recalculated instantly.
What are the BMI categories?: The standard WHO categories are: Underweight (below 18.5), Normal weight (18.5–24.9), Overweight (25–29.9), and Obese (30 and above).
Is BMI an accurate measure of health?: BMI is a useful screening tool but does not account for muscle mass, bone density, or fat distribution. Consult a healthcare professional for a complete health assessment.
Can I use this BMI calculator for children?: Standard BMI ranges are calibrated for adults aged 20 and older. For children and teenagers, BMI is interpreted differently — it is plotted on age- and sex-specific growth charts as a BMI-for-age percentile rather than a fixed category like "overweight." This calculator displays the standard adult classification and is not designed for paediatric use. For children under 18, consult a paediatrician or use a dedicated BMI-for-age percentile calculator and always discuss results with a medical professional.

Local processing

Our local file, text and chart tools process content on your device using JavaScript, browser APIs and, where needed, WebAssembly. Our usage events do not include filenames, file contents, input text, chart values, raw errors, emails or license references. Network lookup tools (such as DNS, WHOIS, IP and speed tests) contact external services for their stated purpose. Loading the website, fonts, libraries and models also makes network requests. WebAssembly itself does not prevent network access.