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BMI Calculator

Additional Metrics
  • Ideal Weight --
  • Weight to Gain/Lose --
  • Daily Calorie Needs --
  • Waist-to-Hip Ratio --
Your BMI

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BMI Calculator – Check Your Body Mass Index Instantly

Wondering if your weight is right for your height? Our BMI calculator online helps you find out in seconds. Simply enter your height and weight to see your Body Mass Index (BMI) and understand if you’re underweight, normal, overweight, or obese.

The body mass index calculator is a reliable, quick screening tool used by doctors worldwide. It gives you a snapshot of your health and helps you take action early.

What is BMI?

BMI stands for Body Mass Index, a measure that uses height and weight to estimate body fat levels. It’s used globally to identify weight categories that may lead to health problems. The body index calculator and fat percentage calculator further help you understand your health status better.

BMI Formula

Metric Units:
 BMI = weight (kg) / height² (m²)

US Units:
 BMI = (703 × weight (lb)) / height² (in²)

Example (metric): 72.5 kg and 1.78 m → BMI = 23.0.
 The bmi calculator with height and weight automates this for you.

BMI Categories for Adults

Category BMI Range
Severe Thinness < 16
Moderate Thinness 16 – 17
Mild Thinness 17 – 18.5
Normal Weight 18.5 – 25
Overweight 25 – 30
Obese Class I 30 – 35
Obese Class II 35 – 40
Obese Class III > 40

The accurate BMI calculator shows your exact number and category.

BMI for Kids & Teens (2 to 20 Years)

For children, BMI is compared to age-based percentiles:

  • Underweight: below 5th percentile
  • Healthy weight: 5th to 85th percentile
  • Overweight risk: 85th to 95th percentile
  • Overweight: above 95th percentile

Health Risks of High BMI

High BMI may increase the risk of:

  • Heart disease, high blood pressure
  • Type 2 diabetes
  • Joint problems and osteoarthritis
  • Sleep apnea
  • Certain cancers

Health Risks of Low BMI

Low BMI can cause:

  • Weak immune system
  • Nutritional deficiencies
  • Reproductive issues
  • Bone loss
  • Higher surgical risks

Is BMI Always Accurate?

The bmi calculator for men and bmi calculator for women are great for general use, but some groups (like athletes or older adults) may need other measures. Our fat percentage calculator, body mass index chart, and body index calculator offer deeper insights.

BMI Prime

BMI Prime = BMI / 25.

  • Below 0.74: underweight
  • 0.74 to 1.0: normal
  • 1.0 to 1.2: overweight
  • Above 1.2: obese

Ponderal Index

Ponderal Index = height (cm) / cube root of weight (kg).
 It works better for very tall or short individuals than BMI alone.

Why Use Our Free BMI Calculator?

  • Quick and precise results with the bmi calculator online
  • No sign-up needed
  • Works for bmi calculator India, body index calculator, and global users
  • Ideal for tracking overall health, along with the obesity calculator and fat percentage calculator

Try It Now

Input your height and weight to get your BMI, Ponderal Index, and health category instantly. The best online bmi calculator helps you take control of your fitness and future health today.

FAQs

For most adults, a BMI between 18.5 and 24.9 is considered healthy.

BMI is a useful screening tool, but it does not directly assess body fat or health. Athletes and those with high muscle mass may have a higher BMI but not excess fat.

Improving BMI involves a combination of healthy eating, regular physical activity, and lifestyle changes. Consult a healthcare provider for personalized advice.