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BMI Calculator

Free BMI calculator using height and weight with US and metric-friendly inputs. Instantly estimate body mass index for general health screening.

Instant result
BMI
23.51
CategoryHealthy

Calculator results are provided for planning and educational purposes. For taxes, legal decisions, lending, or medical advice, verify the numbers with an official source or qualified professional.

About this calculator

This BMI calculator helps you estimate body mass index using your height and weight. It is a quick screening tool commonly used in the US and other English-speaking countries to classify weight range categories at a high level.

How this calculator works

BMI is calculated by dividing weight by height squared. In metric terms the formula is kilograms divided by meters squared. In US-style usage, calculators convert feet, inches, or pounds into the equivalent metric calculation behind the scenes.

How to use it

  1. Enter your height and weight using the fields provided.
  2. Review the BMI value generated instantly.
  3. Use the result as a general screening estimate rather than a full health assessment.
  4. Consult a healthcare professional for advice that considers body composition, age, sex, and medical history.

Example

A person who weighs 180 pounds and is 5 feet 10 inches tall can use a BMI calculator to get a quick index number and compare it with standard BMI categories.

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More ways to explore this calculator

Mega Calculators builds a content cluster around each high-value tool so users can open the live calculator, read the formula, follow a guide, or jump into example pages that match specific search intent.

Frequently asked questions

Is BMI always accurate?

No. BMI is a broad screening metric and does not directly measure body fat, muscle mass, or health status. Athletic or muscular individuals can have a higher BMI without having excess body fat.

Can BMI be used for children?

Children and teens usually require age- and sex-specific BMI percentile charts rather than adult BMI categories.

Should I rely on BMI alone?

No. BMI can be a useful starting point, but waist size, body composition, labs, lifestyle, and medical guidance matter too.

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