Help and FAQ

New here? These answers cover how the tools work, how accurate they are, and how your data stays private.

How do the calculators work?

Pick a tool, type a few details, and tap Calculate. Results appear at once, with a clear figure and plain language guidance. Every page also shows the exact formula, so the math never hides.

Are the results accurate?

Formulas come from respected research and clinical guidelines, and we test each one by hand. Results are reliable estimates for most people. Personal factors still vary, so read each number as a guide and confirm important choices with a professional.

Can I switch between metric and US units?

Yes. Tools that need measurements include a metric and US toggle near the top. Flip it before you calculate, and the labels and result adjust for you.

Is my data private?

Completely. Calculations run inside your browser, so the numbers you enter never reach our servers. Nothing is stored or sold. Our privacy policy goes deeper.

Can I save or share a result?

Each result card includes a Download button that saves a clean image you can keep or share. Copy and Share buttons sit nearby for quick links and text.

Do the tools work on my phone?

They do. Pages adapt to phones, tablets, and desktops, and nothing needs installing. A modern browser is all you need.

How should I read a health result?

Start with the headline number, then read the ranges and notes beneath it. Many tools add insight cards and an expert note to explain next steps. For background, our blog breaks down the science in everyday words.

How do I suggest a new calculator?

Send your idea through the contact page. Reader requests guide much of our roadmap.