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BMI Calculator

100% Free

Calculate your Body Mass Index and find your healthy weight range — metric and imperial.

Metric & Imperial
WHO Categories
Instant
Client-Side
kg
cm
Underweight< 18.5
Normal weight18.5 – 24.9
Overweight25 – 29.9
Obese≥ 30

Your BMI

Body Mass Index
22.9
Normal weight
UnderweightNormalOverweightObese
Healthy weight min56.7 kg
Healthy weight max76.3 kg

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  title="BMI Calculator">
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How to Use

  1. 1 Choose your unit system — Metric (kg/cm) or Imperial (lbs/in)
  2. 2 Enter your weight in kilograms or pounds
  3. 3 Enter your height in centimetres or inches
  4. 4 Your BMI score and category appear instantly with a visual gauge
  5. 5 Check the healthy weight range shown at the bottom for your height

Features

  • Supports both metric (kg/cm) and imperial (lbs/in) units
  • Visual BMI gauge bar with colour gradient from Underweight to Obese
  • Shows exact BMI category — Underweight, Normal, Overweight, or Obese
  • Healthy weight range calculated for your specific height
  • Colour-coded result card matching the WHO BMI classification
  • 100% browser-based — no data is sent to any server

Why it Matters

BMI is the globally recognised first-line screening tool for weight status. Knowing your BMI helps you understand where you stand relative to healthy weight ranges and can guide conversations with healthcare professionals about diet, exercise, and wellness goals.

★★★★★

Use Cases

Personal Health Check

Quickly understand your weight category and healthy range

Fitness Planning

Set a target weight based on your healthy BMI range

School & Sports

Track BMI for PE assessments or athletic screening

Healthcare Reference

A quick reference before a doctor or dietitian visit

Frequently Asked Questions

What is a healthy BMI range?
The WHO defines a healthy BMI as 18.5 to 24.9. Below 18.5 is Underweight; 25–29.9 is Overweight; 30 and above is Obese.
Is BMI accurate for everyone?
BMI is a screening tool, not a diagnostic measure. It may overestimate fat in muscular people and underestimate it in those with low muscle mass. Consult a doctor for a complete assessment.
How is the healthy weight range calculated?
The calculator finds the weights that produce a BMI of 18.5 and 24.9 for your given height.
What units does it use?
Metric: kg and cm. Imperial: lbs and inches. Toggle between them using the unit system buttons.
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Want to understand the math?

Browse all guides →
BMI Chart Explained
bmi

BMI Chart Explained — What Your Number Really Means

Your BMI is a number between roughly 10 and 50. Here's what each range means, how BMI is calculated, where it falls short, and what to do with the result.

1 May 2026

5 min read

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