BMI Calculator

Calculate your Body Mass Index online for free. Get instant health assessment.

✓ Free✓ No sign-up✓ Works in browser

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Height

Weight

lbs

Your BMI

23.6

Normal weight

< 18.5Underweight

18.5 – 24.9Normal

25 – 29.9Overweight

≥ 30Obese

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How to Use This Tool

Choose Your Unit System

Select Imperial (pounds and feet/inches) or Metric (kilograms and centimeters) depending on what units you are comfortable with.

Enter Height and Weight

Enter your height and weight accurately. For the most accurate BMI, weigh yourself in the morning before eating and measure height without shoes.

View Your BMI Result

Your BMI score and health category (Underweight, Normal, Overweight, or Obese) appear instantly with the standard BMI reference ranges.

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Frequently Asked Questions

What is a healthy BMI range?

For adults, a BMI between 18.5 and 24.9 is considered normal weight. Below 18.5 is underweight, 25-29.9 is overweight, and 30 or above is considered obese according to WHO standards.

Is BMI an accurate measure of health?

BMI is a useful screening tool but has limitations. It does not account for muscle mass, bone density, age, or fat distribution. Athletes may have high BMI due to muscle, not fat. Consult a doctor for a complete health assessment.

Can I use this BMI calculator for children?

This calculator is designed for adults. Children and teenagers use BMI-for-age percentile charts that account for growth and development. Ask your pediatrician for an accurate assessment.

How often should I check my BMI?

BMI changes slowly, so checking once every 3-6 months is typically sufficient. More frequent checks can be discouraging due to natural weight fluctuations.

About BMI Calculator

Our BMI Calculator is a free, fast, and privacy-friendly tool that works entirely in your browser. No files are ever uploaded to our servers — all processing happens locally.

Unlike competitors that impose daily limits or require account creation, FreeToolKit gives you unlimited access with zero sign-up. Whether you are a developer, student, designer, or business professional, this tool is built to save you time.