BMI Calculator Tool

BMI Calculator

Calculate your Body Mass Index instantly. Get your BMI score, weight category, ideal weight range, and personalized health tips.

Male
Female
25 yrs
5 yrs100 yrs
170 cm
100 cm220 cm
65 kg
20 kg200 kg
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Enter your details
Height
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Weight
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BMI Score
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Age
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Ideal Weight Range
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To Reach Normal BMI
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BMI Scale — Where Do You Stand?
Under
Normal
Over
Obese I
Obese II
Underweight
Normal
Overweight
Obese I
Obese II+
Below 18.518.5–24.925–29.930–34.935+
Health Tips Based on Your BMI
Note: BMI interpretation differs for children (2-18 years) and elderly (65+). For children, BMI is age and gender-specific. For seniors, a slightly higher BMI (22-27) may be protective. This calculator uses the standard WHO formula and is for estimation purposes only.
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How to Use the BMI Calculator

  1. Select your unit system — Choose Metric (kg/cm) or Imperial (lb/ft).
  2. Enter your details — Select your gender, then use the sliders to set your age, height, and weight.
  3. View your BMI instantly — Your BMI score, weight category, and ideal weight range update in real-time.
  4. Get health tips — Personalized recommendations appear based on your BMI category.

Why BMI Matters for Your Health

Body Mass Index (BMI) is a widely used screening tool that helps assess whether your weight is in a healthy range relative to your height. It's used by healthcare professionals worldwide as a quick indicator of potential health risks associated with being underweight, overweight, or obese.

While BMI is not a direct measure of body fat or health, it provides a useful starting point for conversations about weight management, nutrition, and physical activity. This calculator uses the WHO classification system and provides personalized tips to help you maintain or achieve a healthy weight. All calculations happen locally in your browser — no data is ever sent to any server.

Key Features

  • Dual Unit Support — Switch between Metric (kg/cm) and Imperial (lb/ft).
  • BMI Gauge — Visual gauge showing your BMI on the scale.
  • Weight Category — WHO classification: Underweight, Normal, Overweight, Obese I, Obese II+.
  • Ideal Weight Range — Shows the healthy weight range for your height.
  • Weight Goal — Tells you how much to lose or gain to reach normal BMI.
  • Health Tips — Personalized recommendations based on your BMI category.
  • Age & Gender — Input your age and gender for more personalized results.
  • 100% Private — All calculations happen locally in your browser.

Frequently Asked Questions

BMI (Body Mass Index) is a measure of body fat based on height and weight. It is calculated by dividing your weight in kilograms by your height in meters squared (kg/m²). For imperial units, it's (weight in pounds × 703) ÷ (height in inches squared).
According to the World Health Organization (WHO), a healthy BMI range is between 18.5 and 24.9. Below 18.5 is considered underweight, 25-29.9 is overweight, and 30+ is obese. This calculator uses the standard WHO classification.
BMI is a useful screening tool but has limitations. It may overestimate body fat in athletes with high muscle mass and underestimate it in older adults with low muscle mass. It may also be less accurate for pregnant women and different ethnic groups. Always consult a healthcare provider for a complete health assessment.
The ideal weight range for a healthy BMI (18.5-24.9) varies by height. This calculator shows the ideal weight range for your specific height in both metric (kg) and imperial (lb) units. For example, a person 170 cm tall has an ideal weight range of approximately 53-72 kg.
High BMI (obesity) increases risk of heart disease, diabetes, high blood pressure, stroke, and certain cancers. Low BMI (underweight) may indicate malnutrition, weakened immune system, osteoporosis, and fertility issues. Maintaining a healthy BMI is important for overall health and longevity.
Free BMI Calculator — Track Your Health
Calculate your Body Mass Index instantly with our free BMI calculator. Get accurate results in both metric (kg/cm) and imperial (lb/ft) units, understand your weight category based on WHO standards, view your ideal weight range, and get personalized health tips to reach a healthy BMI. Perfect for fitness tracking, healthcare monitoring, and overall wellness assessment — no registration, no data storage, complete privacy guaranteed.
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All calculations are performed locally in your browser. No data is sent to any server.

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