We built FastCalc to be genuinely useful without watching how you use it. Calculations happen in your browser, and the numbers you enter are never sent to us. The only exception is optional features you choose to use — like a "use my location" button — which are explained below.
No accounts. No tracking pixels. No selling data, because there's no data to sell. What you type into a calculator stays on your device — the only things that ever leave are optional, opt-in actions you take yourself, like fetching local weather.
Calculations are performed locally, on your own device. The values you type into a calculator are processed right there and are not sent to us.
We do not use third-party analytics, advertising trackers, or fingerprinting. There are no pixels following you around the web.
Some calculators offer a "use my location" button. Only if you tap it, your browser shares your approximate coordinates with a weather provider (Open-Meteo) to fetch local conditions. Your location is never stored by us and the button is entirely optional.
This site sets no cookies. Nothing is stored to identify you between visits.
Last updated: June 2026. This is a clear, honest starting point — but privacy law varies by region, so please have it reviewed for your jurisdiction before publishing.
What we collect. Nothing you type into a calculator. Those values stay in your browser and are not sent to us.
Analytics. We do not use third-party analytics such as Google Analytics.
Cookies. This site does not set cookies.
Third parties. Web fonts are loaded from Google Fonts, and our host serves the pages — both may receive your IP address as part of a normal web request. If you tap a "use my location" button, your approximate coordinates are sent to the weather provider Open-Meteo to fetch conditions. Nothing else is shared.
Your rights. Because we don't collect personal data, there's nothing for us to access, export, or delete on your behalf.
Happy to clarify anything here. Reach us via the contact page.