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Harvard Health offers a free BMI calculator that explains BMI interpretation bands and health implications. The page ...
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CDC provides a free adult BMI calculator using either U.S. customary or metric units. It returns your BMI value and corresponding category, and includes context on interpretation and limitations. The tool is publicly accessible with no account or payment required.
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.
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.
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.
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.
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.