Last updated: 2026-10-29
The numbers you enter
All calculations run in your browser. The values you type into our calculators are never sent to our servers or stored.
Information collected automatically
Like most websites, our hosting provider may keep standard server logs (such as IP address, browser type and the pages requested) for security and to keep the site running. We do not use this to identify you.
Advertising and cookies
We use Google AdSense to show ads. Google and its partners use cookies to serve ads based on your previous visits to this and other websites. Google's use of advertising cookies enables it and its partners to serve ads to you based on your visits to this site and/or other sites on the internet.
You can opt out of personalised advertising by visiting Google Ads Settings, or opt out of some third-party vendors' use of cookies for personalised advertising at www.aboutads.info. To learn more, see how Google uses information from sites that use its services.
Visitors in the European Economic Area, the UK and Switzerland are asked for consent before personalised ads are shown, and can change their choice at any time via the privacy settings link shown on the page.
Analytics
We use Google Analytics to understand how visitors use the site, such as which calculators are used most. It uses cookies to collect information like pages visited, time on site, device and approximate location (country or city). This information is aggregated and does not identify you personally, and the numbers you type into calculators are never sent. You can opt out with the Google Analytics opt-out browser add-on.
Children
This site is not directed at children under 13 and we do not knowingly collect information from them.
Changes and contact
We may update this policy from time to time; the date above shows the latest version. Questions? See our contact page.