What is BMI and how is it calculated?

BMI (Body Mass Index) is a measure of body fat based on height and weight. It's calculated as weight in kilograms divided by height in meters squared (kg/m²). For imperial units: (weight in pounds × 703) ÷ (height in inches squared).

Is BMI accurate for everyone?

BMI is a useful screening tool but has limitations. It may overestimate body fat in athletes and muscular individuals, and underestimate body fat in older adults who have lost muscle mass. It should be used alongside other health assessments.

What's a healthy BMI range?

For most adults, a healthy BMI is between 18.5 and 24.9. Below 18.5 is underweight, 25-29.9 is overweight, and 30 or above indicates obesity. However, individual factors like age, muscle mass, and body composition should be considered.

BMI Calculator

Calculate your Body Mass Index with metric or imperial units. Get comprehensive health risk assessment, personalized recommendations, progress tracking, and understand your overall health score.

Weight (kg)

Height (cm)

Age

Gender

Weight: 70.0 kg

Height: 175.0 cm

Common Scenarios

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Accurate BMI Calculation

Precise BMI with category classification and health risk assessment

Progress Tracking

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Goal Setting

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Health Scoring

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BMI Categories & Health Information

BMI Categories

Underweight< 18.5

Normal weight18.5 - 24.9

Overweight25 - 29.9

Obesity≥ 30

Waist Circumference Guidelines

Healthy Range

Men: < 102 cm (40 inches)

Women: < 88 cm (35 inches)

High Risk

Men: ≥ 102 cm (40 inches)

Women: ≥ 88 cm (35 inches)

Important Health Notes:

BMI Limitations: BMI doesn't account for muscle mass, bone density, or body composition. Athletes may have high BMI due to muscle mass. Age Considerations: Older adults may have different healthy weight ranges. Medical Advice: Always consult healthcare professionals for personalized health advice.

Success Stories & User Experiences

Real people achieving their health goals with our BMI calculator

'The BMI calculator helped me track my progress from obesity to healthy weight. The goal setting feature kept me motivated throughout my 18-month transformation.'

- Michael T., Fitness Journey

BMI Calculator FAQs

Answers to common questions about BMI and health calculations