BMI Calculator

Complete BMI Calculator Tool

Our free BMI (Body Mass Index) calculator helps you understand whether your weight is healthy for your height. BMI is a simple screening tool that can indicate whether you're underweight, at a healthy weight, overweight, or obese based on World Health Organization (WHO) standards.

Did you know? The BMI (body mass index bmi calculator) formula was developed in the 1830s by Belgian mathematician Adolphe Quetelet. While it has limitations, it remains the most widely used screening tool for weight categories worldwide.

Why Knowing Your BMI Matters

Thousands of users check their BMI because:

Health awareness: Helps identify potential weight-related health risks
Simple metric: Easy to calculate with just height and weight
Universal standard: Recognized by doctors and health organizations worldwide
Goal setting: Useful for setting and tracking weight management goals
Free and instant: No registration or fees required

BMI Categories (WHO Standard)

BMI Range	Weight Status	Health Risk
Below 18.5	Underweight	Possible nutritional deficiency and osteoporosis
18.5 - 24.9	Normal weight	Low risk (healthy range)
25 - 29.9	Overweight	Moderate risk of developing heart disease, high blood pressure, diabetes
30 and Above	Obese	High risk of developing heart disease, high blood pressure, diabetes, metabolic disorders

How BMI is Calculated

The BMI formula is simple:

BMI = weight (kg) ÷ height² (m²)

For example, a person who weighs 70kg and is 1.75m tall:

BMI = 70 ÷ (1.75 × 1.75) = 22.9 (Normal weight)

BMI Limitations

While BMI is useful, it has some limitations:

Muscle mass: May overestimate body fat in athletes with high muscle mass
Age differences: May underestimate body fat in older adults who've lost muscle
Ethnic variations: Some ethnic groups may have different health risks at the same BMI
Pregnancy: Not suitable for pregnant women
Body composition: Doesn't distinguish between fat and muscle

Frequently Asked Questions

What is a healthy BMI?

A BMI between 18.5 and 24.9 is considered healthy for most adults. This range is associated with the lowest risk of weight-related health problems.

Is BMI different for men and women?

The BMI calculation is the same for both sexes, but women tend to have more body fat than men at the same BMI. Our calculator accounts for this in the healthy weight range.

How accurate is BMI?

BMI is a good screening tool but not a diagnostic measure. It doesn't directly measure body fat. Athletes may have high BMI due to muscle, while older adults may have normal BMI but high body fat.

Should children use this calculator?

No, children and teens need age- and sex-specific BMI calculations. Our calculator is for adults 20+. For children, consult a pediatric growth chart.

What should I do if my BMI is too high or low?

Consult a healthcare provider. They may recommend dietary changes, exercise, or other interventions based on your individual health profile.

Your BMI