Calculator FAQ
Common questions about using Small Calculator Hub — how the tools work, what data we collect, and how to reach us.
Are online calculators free to use?
Yes, every calculator on Small Calculator Hub is completely free, with no sign-up or account required.
Do calculators work on mobile devices?
Yes, every calculator is built to work smoothly on phones, tablets, and desktops.
Are the results accurate?
Calculators are built from standard, publicly documented formulas and tested against worked examples before publishing. See our
Calculator Accuracy and Trust page for details on how we verify each tool and what limitations to keep in mind.
What data do you collect when I use a calculator?
The calculations themselves happen directly in your browser and aren't sent to or stored on our servers. Like most websites, we use Google Analytics and Google AdSense, which may use cookies for analytics and ads. See our
Privacy Policy for full details.
Do I need to install an app or special software?
No, every calculator runs directly in your web browser. There's nothing to download or install.
What calculator categories do you cover?
Financial, Health & Fitness, Math, and a growing Other category covering things like exam score calculators. New calculators are added regularly.
Why does this site show ads?
Ads help keep every calculator free to use with no paywall or subscription. We only use Google AdSense — no pop-under or redirect ad networks.
Can I suggest a new calculator or report an error?