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⚖️ Free BMI Calculator Online

Check your body mass index with WHO classification, health risk assessment, and ideal weight range. No registration. Works offline.

Check Your BMI Free →

How It Works

  1. Enter your height and weight — switch between metric (kg/cm) and imperial (lbs/ft) with one click.
  2. Optionally add age and gender — for more accurate health risk context and ideal weight range.
  3. Get instant results — see your BMI score, WHO category, health risk level, and ideal weight range.

What You Get

Calculate Your BMI Now → 📚 Read the complete BMI guide with health tips

📋 Embed This Calculator on Your Website

Add this free BMI calculator to your blog or website. Just copy the code below.

<iframe src="https://calciq.app/app?calc=bmi"
  width="100%" height="600" frameborder="0"
  style="border-radius:8px;border:1px solid #e5e7eb;"
  loading="lazy"></iframe>
<p style="font-size:12px;text-align:center;margin:8px 0 0">
  Powered by <a href="https://calciq.app" target="_blank"
  rel="noopener" style="color:#f59e0b;font-weight:600;
  text-decoration:none">CalcIQ</a>
</p>

Free to use · No registration required · Includes "Powered by CalcIQ" link

Frequently Asked Questions

How is BMI calculated?

BMI is calculated by dividing your weight in kilograms by your height in meters squared: BMI = weight (kg) / height (m)². For imperial units: BMI = (weight in lbs × 703) / (height in inches)².

What is a healthy BMI range?

According to the WHO, a healthy BMI is between 18.5 and 24.9. Below 18.5 is underweight, 25-29.9 is overweight, and 30+ is obese. BMI doesn't account for muscle mass, age, or body composition.

Is this BMI calculator free?

Yes, completely free with no registration. Your data never leaves your device — all calculations happen locally in your browser. It even works offline.