BMI Calculator

Calculate Body Mass Index from weight and height. Supports metric and imperial units with category classification.

24.2

Normal

1018.5253040+

Healthy weight range

53.5 72.3 kg

BMI Prime

0.97

CategoryBMI Range
Severe Thinness< 16
Moderate Thinness16 – 17
Mild Thinness17 – 18.5
Normal18.5 – 25
Overweight25 – 30
Obese Class I30 – 35
Obese Class II35 – 40
Obese Class III> 40

About BMI Calculator

Enter your weight and height to instantly calculate your Body Mass Index. Switch between metric (kg/cm) and imperial (lbs/inches) units. View your WHO category, a visual gauge, healthy weight range, and BMI Prime value.

Features

  • Metric and imperial unit support
  • WHO category classification (8 levels)
  • Visual BMI gauge with marker
  • Healthy weight range for your height
  • BMI Prime calculation
  • Auto-converts values when switching units
  • 100% client-side — nothing is uploaded

How to use

  1. 1Select metric or imperial units.
  2. 2Enter your weight.
  3. 3Enter your height.
  4. 4View your BMI, category, and healthy range.

Frequently Asked Questions

What is a normal BMI?
A BMI between 18.5 and 25 is considered normal (healthy weight) by WHO standards.
Is BMI accurate for athletes?
BMI doesn't distinguish between muscle and fat mass. Athletes with high muscle mass may have a high BMI without being overweight.
What is BMI Prime?
BMI Prime is your BMI divided by 25 (the upper limit of normal). A value of 1.0 means you are at the upper limit of healthy weight.
Does it work for children?
This calculator uses adult BMI categories. For children and teens, BMI percentiles adjusted for age and sex should be used instead.

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