CalculatorSoup’s BMI tool includes both adult and child BMI modes, with child and teen interpretation based on CDC percentile categories for ages 2–20. It supports multiple unit formats and gives immediate BMI output. Access is free with no mandatory paid subscription.

6 options💪 Body Metrics & Fitness

BMI Calculator for Women6 options

This free BMI calculator supports US and metric units and includes sex selection (male/female), BMI category output, and healthy weight range estimates. It also provides WHO-based adult BMI classification tables and additional context like BMI Prime. No paid plan is required to use the tool.

6 options💪 Body Metrics & Fitness

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NHLBI (National Heart, Lung, and Blood Institute)

nhlbi.nih.gov

NHLBI offers a free BMI calculator with standard and metric input options. It shows BMI categories and links to addit...

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WebMD

webmd.com

WebMD's BMI calculator is free and designed for adults to estimate body mass index from height and weight. It explain...

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American Cancer Society

cancer.org

ACS offers a free BMI calculator that estimates BMI from height and weight and displays the related weight category r...

BMI Calculator for Men5 options

This free BMI calculator supports male/female selection, multiple unit systems, and instant BMI classification. It includes healthy range guidance and expanded metrics like BMI Prime and Ponderal Index. The page notes adult BMI categories used for men and women.

5 options💪 Body Metrics & Fitness

BMI Calculator for Kids6 options

This free NHS calculator checks BMI for children and teenagers aged 2 to 17, covering both girls and boys including age 9. It uses child-specific inputs such as date of birth, sex at birth, height, and weight to provide guidance. The page also explains who should use the tool and limitations of BMI interpretation.

6 options💪 Body Metrics & Fitness

BMI Weight Loss Calculator5 options

Its BMI Calculator is free to use and provides BMI category plus a healthy weight range for your height. You can use the healthy range output to estimate how much weight to lose to get back to a target BMI range (typically under 25). It supports US and metric units and works instantly in-browser.

5 options💪 Body Metrics & Fitness

Geriatric BMI Calculator

The geriatric BMI calculator is designed for older individuals over 65 years of age. It calculates BMI and determines if the person is underweight, overweight, or a healthy weight.

1 option💪 Body Metrics & Fitness

BMI Calculator – Body Mass Index

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