About FitCalcly

FitCalcly is a collection of 24 free health and fitness tools built around one idea: your health numbers should be easy to find, easy to understand, and honest about their limits.

What makes our tools different

• Guided, animated interfaces — diagrams highlight exactly where to measure, results explain themselves visually, and every tool works in metric and imperial.
• Published formulas only — WHO BMI classification, Mifflin-St Jeor, the US Navy body-fat method, FINDRISC, Naegele's rule and other clinically used standards, each cited in a Sources section on the page.
• Honest limits — where a formula has blind spots we say so, and where only a doctor or a blood test can answer (thyroid, diabetes, cataract), our tools route you there instead of pretending.
• Practical next steps — most results come with foods to eat and avoid, printable/downloadable summaries, and links to the logical next tool.

Every tool we offer

What we are not

FitCalcly is an educational resource, not a medical service. Results are estimates and never replace advice from a doctor, registered dietitian, or other qualified professional — several of our tools exist specifically to tell you when a professional visit or a blood test is the right next step.

Questions, corrections or tool ideas? Reach us via the contact page. If FitCalcly saves you time, you can support the project ❤️.