CalcBit.
HealthUpdated 2026-06-14

BMI Calculator

Calculate your Body Mass Index (BMI) and know your weight category. Free BMI calculator with metric and imperial units.

Calculator widget coming soon. Use the information below to understand this tool.

OverviewHow It WorksFormulaExamplesBenefitsFAQRelated

What is BMI Calculator?

A BMI (Body Mass Index) calculator measures body fat based on height and weight. It provides a general indication of whether you are underweight, normal weight, overweight, or obese.

How It Works

The calculator divides your weight in kilograms by the square of your height in meters. The result is compared against standard BMI categories.

Formula & Calculation Method

BMI = Weight (kg) / Height (m)²

BMI Categories for Indian population: <18.5 Underweight, 18.5-22.9 Normal, 23-24.9 Overweight, 25-29.9 Obese Class I, ≥30 Obese Class II

Examples

Standard BMI

1Weight: 70 kg

2Height: 1.75 m

3BMI = 70/(1.75)²

4BMI = 22.86

5Category: Normal weight

BMI: 22.86 (Normal)

Benefits

  • 1
    Quick health assessment
  • 2
    Weight management tracking
  • 3
    Health risk indicator
  • 4
    Simple and widely used
  • 5
    Free and private

Common Use Cases

Personal health monitoringFitness goal trackingMedical screeningInsurance assessmentWeight loss progress tracking

Expert Tips

  • 1
    Use Asian BMI cutoffs for accurate assessment
  • 2
    Track BMI trends over time, not just single values
  • 3
    Combine BMI with waist-to-hip ratio for better assessment
  • 4
    Consult a doctor for personalized health advice

Common Mistakes to Avoid

  • !
    Using wrong height units
  • !
    Not using Asian BMI cutoffs
  • !
    Relying solely on BMI (ignoring muscle mass)
  • !
    Not tracking BMI over time for trends
  • !
    Comparing with Western population ranges

Frequently Asked Questions

Find answers to common questions about this calculator below.

BMI = Weight (kg) / Height (m)². For example, a person weighing 70 kg with height 1.75 m has BMI = 70/(1.75)² = 22.86 (Normal weight).

For the Indian population, a BMI of 18.5-22.9 is considered normal. Indians are at higher risk of metabolic diseases at lower BMIs compared to Western populations. The WHO Asian BMI cutoff of 23-24.9 for overweight is more appropriate.

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