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This policy applies to the use of “cookies” in connection with the website (the Calculus website). Cookies are only used for the essential use of this website, and for users to efficiently browse the site. Cookies are small text files containing information that is downloaded to your computer or mobile device when you visit a website, to collect standard internet log information and visitor behaviour information. You can set your browser not to accept cookies or to remove cookies from your browser. However, in a few cases some of the Calculus website features may not function as a result. For more information about how to disable cookies in your browser please visit

Please see list below of cookies used on the Calculus website.

Cookie NameCategoryDescription
calculus_terms_agreestrictly necessaryThis cookie is used to indicate that you have previously agreed to our terms and conditions and our use of cookies, thus preventing you from having to consent on each visit
_cfduidstrictly necessaryUsed by the content network, Cloudflare, to identify trusted web traffic
PHPSESSIDstrictly necessaryPreserves user session state across page requests
langpreferencesRemembers the user’s selected language version of a website

We may occasionally collect analytics data via Google Analytics, to improve your use of the website. We do not share with any third parties. All information processed remains anonymous. Please see below for a list of Google Analytics cookies.

Cookie NameCategoryDescription
_gaStatisticsRegisters a unique ID that is used to generate statistical data on how the visitor uses the website
_gatStatisticsUsed by Google Analytics to throttle request rate
_gidStatisticsRegisters a unique ID that is used to generate statistical data on how the visitor uses the website

Third party plug-ins from Vimeo may also occasionally be used, to embed videos on the Calculus website to enhance your user experience.