Q. What is a normal BMI?

By Asia-Pacific standards, 18.5–22.9 is considered normal. The WHO uses a slightly wider range of 18.5–24.9.

Q. Can children use this BMI calculator?

This calculator is designed for adults (18+). Children and adolescents should use age-specific BMI percentile charts.

Q. Is ideal weight the same as recommended weight?

Ideal weight here is based on a BMI of 22 and may vary depending on body composition and muscle mass.

Q. How is the healthy height range calculated?

Min height = √(weight ÷ 22.9) × 100, Max height = √(weight ÷ 18.5) × 100.

Q. How is BMI different from body fat percentage?

BMI compares only weight and height, so it cannot tell muscle from fat. Body fat percentage measures fat mass directly; if you are muscular or carry weight around the waist, body fat percentage and waist circumference give a more accurate picture.

BMI Calculator

Easily calculate your BMI. Enter your height and weight for instant results.

Height (cm) Weight (kg)

What is BMI?

BMI (Body Mass Index) is calculated by dividing weight (kg) by height (m) squared. It is widely used as an international health indicator. BMI quantifies the weight-to-height ratio and helps assess risk for chronic diseases such as cardiovascular disease, diabetes, and hypertension.

Formula

BMI = Weight (kg) ÷ Height (m)²

Ideal Weight = Height (m)² × 22

e.g. Height 170cm, Weight 65kg → 65 ÷ (1.70 × 1.70) ≈ 22.5 (Normal)

BMI condenses the weight-to-height ratio into a single number. The ideal-weight formula multiplies the height in metres squared by 22, the middle of the healthy range, which is the common convention in Korea and Japan; the WHO does not define a single ideal BMI, so treat the result as a midpoint rather than a target.

BMI Classification (Asia-Pacific)

BMI	Category	Health Risk
< 18.5	Underweight	Nutritional deficiency risk
18.5 – 22.9	Normal	Low
23.0 – 24.9	Pre-obese	Moderate
25.0 – 29.9	Obese Class I	High
≥ 30.0	Obese Class II	Very high

What is the healthy height range for your weight?

Based on your current weight, we calculate the height range that falls within a normal BMI (18.5–22.9). For example, at 65 kg the healthy height range is approximately 168–187 cm.

Limitations of BMI

BMI does not account for muscle mass, bone density, or fat distribution. Athletes with high muscle mass may have a high BMI but be healthy, while someone with a normal BMI may still carry excess visceral fat. Use BMI as a reference only and consult a healthcare professional for an accurate assessment.

FAQ

Q. What is a normal BMI?: By Asia-Pacific standards, 18.5–22.9 is considered normal. The WHO uses a slightly wider range of 18.5–24.9.
Q. Can children use this BMI calculator?: This calculator is designed for adults (18+). Children and adolescents should use age-specific BMI percentile charts.
Q. Is ideal weight the same as recommended weight?: Ideal weight here is based on a BMI of 22 and may vary depending on body composition and muscle mass.
Q. How is the healthy height range calculated?: Min height = √(weight ÷ 22.9) × 100, Max height = √(weight ÷ 18.5) × 100.
Q. How is BMI different from body fat percentage?: BMI compares only weight and height, so it cannot tell muscle from fat. Body fat percentage measures fat mass directly; if you are muscular or carry weight around the waist, body fat percentage and waist circumference give a more accurate picture.