Health Calculators

This section focuses on practical, everyday health math: numbers that help you plan training, recovery, sleep, hydration, and general habits. The goal is clarity over hype. Each calculator applies well-known formulas and sensible defaults, then formats the outcome so it’s easy to read on a small screen. You can switch units when relevant and repeat a calculation as many times as you like without losing your place or reloading the page.

Results are best treated as estimates, not diagnoses. Bodies vary, and so do routines, stress, and sleep. Use outputs to set a reasonable starting point, then adjust based on energy levels, performance, and recovery across a few weeks. If a value looks extreme, sanity-check inputs: confirm units, round to realistic ranges, and keep measurement methods consistent over time. Trends are more informative than a single reading.

We design for speed and privacy. Calculations run locally in your browser and are not sent to a server. Pages cache efficiently so tools load quickly even on spotty connections; once opened, they continue to work offline until you refresh. Interface elements maintain large tap targets, high contrast, and keyboard support for accessibility. On mobile, compact buttons let you reach many tools with minimal scrolling, while headings and copy remain lightweight and skimmable.

Good judgment beats perfect numbers. Use these estimates as guardrails while you build durable habits — regular movement, balanced meals, quality sleep, stress management, and check-ins with a qualified professional when something feels off. When you’re ready to explore more topics, simply return here and pick another calculator from the list.