BMI Calculator

Everyday & learning

BMI with WHO and Asia-Pacific categories.

Body mass index
24.2
70 kg ÷ 1.7 m squared
Asia-Pacific
Overweight
WHO international
Normal
Healthy weight
53.5–66.5 kg
Units

The two scales disagree here. The Asia-Pacific thresholds say overweight; the international scale says normal. Asia-Pacific is the more appropriate reference for Filipino adults.

How to use

What it's for

Work out your body mass index (BMI) — one number from your height and weight, used to screen for being under- or overweight. It is a general reference figure, not a diagnosis.

Before you start

Have your height and your weight, measured recently. Centimetres and kilograms work, and so do inches and pounds.

  1. Pick your units

    Under Units, press Metric for centimetres and kilograms, or Imperial for inches and pounds. Switching converts the numbers already typed, so you do not have to start again.

  2. Enter your height

    Type your height in Height (cm) — 170, not 1.70. On Imperial the box is Height (inches): 5 feet 7 inches is 67.

  3. Enter your weight

    Type your weight in Weight (kg), or in Weight (pounds) on Imperial. Decimals are fine, such as 68.5. Type the number only, without kg or lb after it.

  4. Press Calculate

    Press Calculate. The answer already updates as you type; the button brings it into view.

Reading the result

  • Body mass index: your BMI, with the sum it came from under it — your weight divided by your height squared.
  • Asia-Pacific and WHO international: the group your BMI falls in on each of two scales. When they differ, a note says so; the page treats Asia-Pacific as the better fit for Filipino adults.
  • Healthy weight: the weight range, in kilograms, that falls in the normal band of the Asia-Pacific scale for your height.

If it goes wrong

  • An error says the height is outside the range this tool covers: it was probably typed in metres (1.70) or in the wrong unit. Type centimetres, or press Imperial for inches.
  • Height must be a number. or Weight must be a number.: the box holds a letter or a symbol, such as cm or kg. Type the number only.
  • The result says overweight but you are muscular: BMI cannot tell muscle from fat. It is a screening number; a doctor can tell you what it means for you.

What this is

Body mass index is your weight in kilograms divided by the square of your height in metres. It is a rough screening figure for whether your weight is likely to be a health risk — useful across a population, blunt for any individual.

This page shows two classifications because they do not agree. The international thresholds were drawn largely from European populations; the Asia-Pacific thresholds are lower, because health risks linked to body fat appear at lower BMI values in Asian populations. At a BMI of 24 the two scales give opposite answers.

Questions

Why are there two sets of categories?

Because they disagree, and the disagreement matters. The international thresholds were drawn from mostly European populations. Health risks associated with body fat appear at lower BMI values in Asian populations, so a separate Asia-Pacific scale exists with lower cut-offs for overweight and obesity. For a Filipino adult, the Asia-Pacific scale is the more appropriate reference.

Is BMI accurate for me?

BMI is a population screening tool, not a diagnosis. It does not distinguish muscle from fat, and it does not account for build, age, pregnancy or ethnicity beyond the two scales shown. A muscular person can register as overweight while carrying very little fat. Treat it as one number among several, and talk to a doctor about what it means for you.

What is a healthy weight for my height?

The range shown is the Asia-Pacific normal band (BMI 18.5 to 23) converted back into kilograms for your height. It is a guide, not a target.

The scales

Asia-Pacific
Underweight0–18.5
Normal18.5–23
Overweight23–25
Obese class I25–30
Obese class II30+
WHO international
Underweight0–18.5
Normal18.5–25
Overweight25–30
Obese class I30–35
Obese class II35–40
Obese class III40+

The bands come from the engine, so this table and the figure above can never drift apart.

Keep going

Important

This is a screening figure, not medical advice or a diagnosis. BMI does not distinguish muscle from fat, and it is not a substitute for talking to a doctor. Nothing you type here is sent to our servers — the calculation runs entirely in your browser.