Your numbers are yours.

This site does not require an account. Calculator inputs are processed locally in your browser and are not submitted to a server or stored in cookies.

Cookies, analytics and advertising

We use Google Analytics to understand how the site is used, and may show adverts through Google AdSense to help cover hosting costs. Both are optional and cookie-based. We only switch them on after you accept them in the cookie banner; until then, no analytics or advertising cookie is set. You can change your choice at any time using “Cookie settings” in the footer of any page. See our Cookies page for the full list of cookies, what they do and how long they last.

What Google processes on our behalf

If you accept analytics, Google Analytics (provided by Google Ireland Limited) processes standard usage data: pages viewed, approximate location derived from a shortened IP address, device and browser type, and how you arrived at the site. We do not send your calculator inputs to Google. Google also uses some of this data for its own purposes, as set out in Google’s privacy policy, and may process it outside the UK and EEA under Google’s standard contractual safeguards.

Advertising

Adverts, when enabled, are served by Google AdSense. If you accept advertising cookies, ads may be personalised to your interests; if you reject them, you may still see ads, but they will not be personalised using cookies. You can change this choice at any time.

Hosting information

The hosting provider may process ordinary request information such as your IP address, browser information, requested URL, and request time to serve and secure the site. Calculator values are not added to those URLs.

Copying a result

When you select Copy result, the site asks your browser to write the result to your clipboard. It does not read your clipboard. If your browser denies access, the answer is selected on the page so you can copy it manually.

Your rights

Under UK and EU data protection law, you can withdraw analytics or advertising consent at any time using “Cookie settings”. For data Google processes on our behalf, Google provides its own access, deletion and objection controls at Google Account & data privacy. Because calculator inputs never leave your browser, we do not hold any calculation data to disclose, correct or delete.

External links

Any linked external website has its own privacy practices. If we change what analytics, ads, or other data collection this site uses, we will update this policy first.