BMI Calculator

Check your Body Mass Index (BMI) with our Free BMI Calculator online. Instantly calculate BMI for men and women using height and weight to track healthy weight.

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Underweight

Normal

Overweight

Obesity


BMI(0%, Category)

0 kg/m²


Weight-for-age percentile

Height-for-age percentile

Healthy BMI range

Healthy weight for height

Weight to lose for healthy BMI


CDC BMI Categories for Children and Teens
BMI Percentile Range Weight Status
Less than 5th percentile Underweight
5th to less than 85th percentile Healthy weight
85th to less than 95th percentile Overweight
95th percentile or greater Obese

Calcify's BMI Calculator allows you to quickly determine your Body Mass Index from your height and weight. BMI is meant to be a simple screening tool that can show you if you fall into one of the medical guidelines' categories of underweight, normal weight, overweight, or higher weight ranges. Body Mass Index is usually used in health assessments and fitness testing because it provides a quick snapshot of your current position.

As one example, if you enter 170cm and 70kg into the BMI Calculator, you will see your BMI number appear as well as which general range it falls into. This could inform your beginning ability to ask yourself questions about nutrition, movement, feet, sustainability, and lifestyle habits. While BMI does not directly measure body fat or muscle quality, it is a helpful first step in tracking progress over the longer term. After using the BMI Calculator to appreciate your current zone, check out more of Calcify's wellness tools or use the other tools to get the full picture of your health journey.

FAQs

A BMI Calculator estimates your Body Mass Index based on your height and weight, indicating if you're underweight, normal, overweight, or obese.

BMI is calculated using the formula: BMI = Weight (kg) ÷ Height (m²). For ease, you can use this free BMI calculator online.

Yes, this is a free BMI calculator available online without any registration or payment.

Yes, this tool works well for both men and women.

A BMI of 18.5 – 24.9 is considered healthy.

You should make a calculation for your BMI after any major weight changes, and/or as part of your regular health assessments.

BMI is a useful general measure but does not tell the difference between fat and muscle.

Yes, by knowing your BMI you can set realistic weight targets and measure your progress towards achieving your goal weight.

Athletes may have a higher BMI predominately due to muscle, therefore it would be good to also assess other metrics such as body fat percentages in decision making.

This online BMI calculator will provide a high level of accuracy around BMI scores, but you should always reach out to a healthcare professional for a full health assessment.

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