BMI Calculator

Tool statusWorks in browserNo account neededEstimate onlyGeneral information

Functional health tool

Calculate adult BMI with metric measurements or separate feet and inches. The result shows the formula, standard adult screening category, and a clearly labelled height-based reference interval.

Unit systemAge (20 or older)

Weight (kg)Height (cm)

Estimate

Estimated adult BMI: 24.2
Adult screening category: Healthy weight (18.5 to 24.9)
Age entered: 35
Unit system: Metric

Formula
70 kg ÷ (1.7 m × 1.7 m) = 24.22

Height-specific reference
Weight interval corresponding mathematically to BMI 18.5–24.9: 53.5–72 kg
This interval is not a personalized target or diagnosis.

Important
BMI measures weight relative to height. It does not directly measure body fat, muscle, bone, fitness, nutrition, pregnancy, or individual health.

Download result

For adults age 20 and older only. BMI is one screening measure and should be considered with medical history, physical findings, laboratory results, body composition, pregnancy status, medications, and other individual factors.

Tool guide

How to use the BMI Calculator

Use the BMI Calculator to calculate body mass index from height and weight. The metric formula is weight in kilograms divided by height in meters squared. BMI is a screening measurement used to describe weight relative to height, but it does not directly measure body fat, fitness, muscle mass, health, or an individual diagnosis.

People also use this tool for

People also use this BMI calculator to estimate body mass index, check general weight categories, compare height and weight changes, track wellness goals, and understand a basic health measurement before discussing results with a healthcare professional.

What this tool is useful for

Calculate BMI using metric or imperial height and weight.
Understand the standard adult screening category associated with the result.
Track a broad height-to-weight measurement before discussing personal health with a qualified professional.

Practical example

A person who weighs 70 kg and is 1.75 m tall has a BMI of about 22.9 because 70 ÷ (1.75 × 1.75) = 22.86. The numerical result should be interpreted cautiously because two people with the same BMI can have very different body composition and health circumstances.

Helpful tips

BMI categories commonly used for adults are not interpreted the same way for children and teenagers.
Pregnancy, high muscularity, age, ethnicity, disability, and individual medical circumstances can limit how informative BMI is.
Do not use one BMI result to diagnose yourself, change medication, or replace professional medical advice.

Related tools and next steps

What is the adult BMI formula?, What do adult BMI categories mean?, Is BMI a diagnosis of health or body fat?, Why does the calculator ask for age?, Can muscular people have a high BMI?, What is the displayed height-specific weight interval?, When is BMI less informative?, What should I do with an unexpected BMI result?

Common questions this tool can help answer

Common BMI questions this calculator can help answer

What is my BMI?
What BMI category does this estimate fall into?
How does height and weight affect BMI?
Is BMI a medical diagnosis?
When should I ask a healthcare professional about my results?

Sources and methodology

The formulas, standards, and reference information on this page are checked against the authoritative sources below. External references open the original source.

Frequently asked questions

How is BMI calculated?

Metric BMI equals weight in kilograms divided by height in meters squared. Imperial BMI uses weight in pounds divided by height in inches squared, multiplied by 703.

Is BMI a diagnosis?

No. BMI is a population-level screening measurement, not a diagnosis of body fat, fitness, nutrition, or health.

Does the adult BMI calculation apply to children?

Children and teenagers require age- and sex-specific growth-chart interpretation. Standard adult category cutoffs should not be applied directly to them.

Can a muscular person have a high BMI?

Yes. BMI does not separate muscle, bone, fat, or fluid, so muscular people can receive a high result without having the body-fat level the number might imply.

What should I do with an unexpected result?

Treat it as one limited screening value and discuss concerns with a qualified healthcare professional who can consider your history, measurements, symptoms, medications, and circumstances.

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