BMI Calculator
Calculate your Body Mass Index (BMI) using metric or imperial units. All calculations happen locally in your browser.
—
Note: BMI is a general screening metric for adults. It may not perfectly reflect body composition for athletes, seniors, or certain medical conditions.
Check your body health instantly with FreeToolConvert’s Free Online BMI Calculator. Our accurate and easy-to-use tool helps you calculate your Body Mass Index (BMI) using your height and weight — giving you instant insights into whether you are underweight, healthy, overweight, or obese. With FreeToolConvert, you can calculate BMI online for free without installing any app or software. It’s perfect for fitness tracking, diet planning, and overall health awareness. Simply enter your height (in cm or inches) and weight (in kg or lbs), and get instant, accurate results along with your BMI category. Stay informed about your fitness level with FreeToolConvert’s BMI Calculator, your reliable online health and fitness tool.
Fast & Easy BMI Calculator
Enter your height and weight to instantly calculate your Body Mass Index (BMI). Get accurate results along with a clear health category — perfect for fitness tracking, wellness goals, and medical reference.
Calculate BMI With Precision
Our BMI Calculator gives you:
Your exact BMI value
Health classification (Underweight, Normal, Overweight, Obese)
Easy-to-read result interpretation
Quick insights into your weight status
This helps you monitor fitness progress, understand your health range, and make informed lifestyle decisions.
File Protection Guaranteed
Your height and weight inputs are protected with advanced TLS encryption. After calculation, all temporary data is automatically deleted from our servers within one hour — ensuring total privacy and security.
Calculate BMI Online — No Software Needed
The tool runs entirely in your browser. Whether you’re on Windows, macOS, Linux, or mobile, you can calculate BMI instantly without installing anything.
Perfect for Fitness, Health & Daily Tracking
Use the BMI Calculator for:
- Personal fitness monitoring
- Health and wellness planning
- Gym assessments
-
Medical and nutrition reference
- Weight-loss or weight-gain tracking
Your results are simple, clear, and actionable.
Accurate BMI Categories
Based on your BMI value, you’ll see a health status such as:
- Underweight (BMI < 18.5)
- Normal Weight (BMI 18.5 – 24.9)
- Overweight (BMI 25 – 29.9)
-
Obesity (BMI 30 and above)
These categories follow standard World Health Organization (WHO) guidelines.
Process Everything in the Cloud
All calculations are done securely in the cloud — no CPU load on your device, fast results, and zero installation needed.
How To Calculate BMI Online
- Enter your weight (kg or lbs).
- Enter your height (cm, m, or ft/in).
- Click Calculate BMI
- View your BMI value and health category — done!
BMI Calculator FAQs
No — BMI is based only on height and weight, but interpretation may vary for children and athletes.
Yes — multiple unit formats are supported.
BMI is a basic indicator; body composition and lifestyle also matter.
Yes. Everything is encrypted and automatically deleted after one hour.
Yes — the tool works on all modern browsers and smartphones.
Yes! Calculate BMI as many times as you need at no cost.