About

WHY SARX EXISTS

Context is what most tools skip entirely.

Most health calculators hand you a BMI number and disappear. Sarx connects your data to what it actually means: your TDEE so you can set a real calorie target, your body fat so you understand composition, your ideal weight range so you know where you're headed.

The Learning Library extends that context beyond numbers. Every topic is ranked by clinical evidence tier, not marketing. High-evidence research comes first. Trends are flagged, not buried. The goal is to help you make one better decision per week, not to overwhelm you with every wellness fad on the internet.

THE SCIENCE

Peer-reviewed formulas. Real evidence.

Every calculation in Sarx is based on validated, peer-reviewed research. The formulas used were chosen for accuracy and widespread clinical adoption, not because they were simple to code.

The Mifflin-St Jeor equation is the most accurate BMR formula for the general population according to the Academy of Nutrition and Dietetics. Body fat estimation uses the Deurenberg formula (BMI-based), which correlates well with DEXA scan results for most adults. Ideal weight range is calculated from the Devine formula plus a 30 lb window to account for muscle mass variation.

YOUR DATA

Stored locally. Never uploaded.

Everything you enter stays on your device. Sarx uses your browser's localStorage to save your metrics between sessions so you don't have to re-enter them. That data never leaves your device. There are no accounts, no tracking, and no servers storing your health information.

This is not a privacy policy exception. It is the entire architecture. There is no backend to send your data to.

WHO BUILT THIS

Built by Chaisson Cook.

I'm Chaisson Cook, a software engineer and CS student at UNLV. After years of using cluttered, ad-heavy health calculators that gave numbers without context, I built the tool I actually wanted to use: clean, fast, and evidence-grounded.

The goal was simple: give anyone accurate health metrics in under 60 seconds, without an account, without ads, and without noise. Every design and content decision runs through that lens.

You can learn more at chaissoncook.com.

DISCLAIMER

Informational only. Not medical advice.

Sarx provides health calculations and educational content for informational purposes only. The results generated by this tool are estimates based on population-level formulas and do not account for individual medical conditions, medications, or clinical factors.

Always consult a qualified healthcare provider (a physician, registered dietitian, or certified trainer) before making decisions about your health, diet, or exercise routine. Sarx is a starting point for informed conversations, not a replacement for professional advice.