My Wellness Calc is a collection of free, science-backed calculators and guides designed to help you make better everyday health decisions — without paywalls, popups, or prescriptions.
Every tool on this site is completely free to use. No account, no email, no payment — ever. Just open it and use it.
Every formula and recommendation on this site is grounded in established research. We cite our sources and explain our methods.
We tell you what the science supports — and what it doesn't. No miracle claims, no fear-mongering, no supplement upsells disguised as advice.
Your calculator inputs never leave your browser. We don't store, sell, or share any health data you enter on this site.
Every tool is designed to work perfectly on phone, tablet, or desktop. Fast, responsive, and no app download required.
We add new tools based on reader requests and update existing ones when research evolves. This is a living project.
Health information online is often confusing, contradictory, or hidden behind sign-up walls. A simple question — "how many calories should I eat?" — leads you to a 3,000-word blog post that ends with a $79/month subscription.
We built My Wellness Calc to be the opposite: a set of clean, fast, accurate tools that give you a direct answer and explain the reasoning behind it. No fluff, no friction.
All tools are built on formulas from peer-reviewed research and established health organizations like the WHO, NIH, and EFSA. We explain the limitations of every tool, because context matters as much as the number itself.
We're a small independent site. If you find our tools useful, the best way to support us is to share them with someone who needs them.
Some tools on this site include links to third-party products (primarily iHerb and select fitness apps) marked with a "Partner" label. If you click through and make a purchase, we may earn a small commission at no additional cost to you. These links help keep the site free. We only recommend products that are relevant to the tool's context — we do not accept payment to feature specific products.
From BMI to intermittent fasting — find the calculator you need.
Browse all calculators →