Help Center

Most calculators work the same way: enter your values, click calculate, and see the result along with a plain-language explanation of what it means. If something isn't working as expected, here are answers to the most common questions.

A calculator gave me an unexpected result

Double-check your inputs first — most unexpected results come from a misplaced decimal, a wrong unit (like entering a diameter where a radius is expected), or a percentage entered as a whole number instead of a decimal. Each calculator page includes a "Common Mistakes" section covering the most frequent input errors for that specific tool.

Do I need an account to use the calculators?

No. Every tool works instantly without sign-up or login.

Is my data saved anywhere?

No. Calculations run entirely in your browser. See our Privacy Policy for full details.

I found a calculator that seems wrong, or I need a tool that doesn't exist yet

Please let us know at contact@numarly.com or via the Contact page. We review reports and requests regularly.