Help, Requests & Suggestions
Have a question about a calculator? Want a new one built? Spotted a bug or have an idea to make the site better? You're in the right place.
Frequently asked questions
Are the calculators free to use?
Yes — every calculator on Calculator Friendly is free, with no sign-up required.
How accurate are your calculators?
We test each calculator against trusted reference formulas and worked examples before publication. That said, calculators are general tools — for important decisions, always confirm with a qualified professional. See our Disclaimer.
Do you store the values I enter?
No. Inputs are processed inside your browser and are not transmitted to our servers, unless a particular calculator clearly states otherwise.
How do you choose which calculators to build next?
Mostly from reader requests. The form below feeds directly into our backlog.