Free Health Calculators
Track your health with free, private calculators for BMI, daily calories, macronutrients, pregnancy and ovulation timing. Each tool uses peer-reviewed formulas (Mifflin-St Jeor, Naegele's rule, WHO BMI ranges) and runs locally in your browser.
About our health tools
Free health and wellness calculators including BMI, calorie needs, pregnancy due dates, and macros.
Every tool in the Health Calculators collection is engineered for speed and accuracy. We use battle-tested formulas, follow accessibility best practices (WCAG 2.2 AA), and pre-render every page to static HTML so results appear the moment you open the page — even on slow mobile connections.
Privacy is the foundation of Health. Inputs you type, files you select, and outputs you generate stay on your device. There is no upload step, no telemetry beyond anonymized page views, and no third-party tracking on tool calculation logic. That's why teachers, students, marketers, developers and everyday users return to WebGenAI thousands of times per month.
If you have a tool you'd like us to add to the health collection, let us know. We ship new tools every week based on what real users request.