Health tools: methods, sources and editorial standards
Moodji publishes these tools to help you understand everyday health measurements and self-assessments. This page explains how to read their methods and the limits of their results.
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Purpose and responsibility
The tools are published by Moodji. Calculations and questionnaires provide estimates or screening information, rather than an individual medical diagnosis. Interpret the result alongside the method, intended population and limitations on the tool page.
Sources and reference ranges
Use the references listed on each tool page to identify the underlying study, questionnaire or institutional guidance. A citation describes a source; it does not imply that its authors endorse Moodji. Check the population, version and units before applying a reference range to yourself.
Inputs, formulas and examples
A formula should match the method and units used by the calculator. For example, our body fat calculator uses the circumference method with lengths in cm. For a man measuring 175 cm in height, 70 kg in weight, 85 cm at the waist and 38 cm at the neck, it estimates 16.9% body fat. Fat-free mass includes more than muscle.
Measurements and estimated models
A result is affected by input quality and measurement conditions. Browser reaction-time results also depend on the device and input delay. The age-reference page describes an estimated model with calibration assumptions; its percentiles are not a new population study collected by Moodji.
Updates and review information
The editorial standard for an update is to compare the stated method with the calculation or scoring, check units and worked examples, and revisit the relevant sources. The date shown is a page-update date. A clinical reviewer is identified separately only when that review is documented; an update date or citation alone does not mean clinical review.