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BMI Calculator (body mass index)

Enter weight and height to get your BMI and category (underweight, normal, overweight, obese) by WHO standards.

Quick answer

70 kg, 170 cm: BMI 24.2 (Normal).

How it is calculated

  1. Convert height to metres: 170 cm = 1.70 m.
  2. BMI = weight (kg) ÷ height² (m²) = 70 ÷ (1.70 × 1.70).
  3. WHO: under 18.5 underweight, 18.5–24.9 normal, 25–29.9 overweight, 30+ obese.

Worked example

A person weighing 70 kg and 170 cm tall has a BMI of 24.2, category Normal.

Example values
Weight70 kg
Height170 cm
Result
BMI24.2
CategoryNormal
Formula

WHO BMI classification

B = Wk/(Hc/100)^2
BMI = B
Category = !(B>0)||B>200?"—":B<18.5?"Underweight / कम वज़न":B<25?"Normal / सामान्य":B<30?"Overweight / ज़्यादा वज़न":"Obese / मोटापा"

Good to know

Questions people ask

What is a normal BMI?

18.5 to 24.9 by WHO.

How do I calculate BMI?

Weight (kg) ÷ height (m) squared.

Is it for children?

No, children use separate age-based charts.

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Updated 13 Nov 2026 · Desktop N Calculator v1.2.0