Cookie Policy

A cookie is a small text file that a website stores on your device (computer, tablet or phone) when you visit it. Cookies allow the website to "remember" your actions and preferences — such as remembering that you've accepted a cookie banner, or keeping you logged in — over a period of time.

Cookies are widely used across the web to make sites work efficiently and to provide reporting information. They do not contain software programmes or viruses, and they cannot access the rest of your device.

For the purposes of this policy, the term "cookies" also covers similar technologies such as local storage, session storage, and pixel tags, which work in similar ways.

We group the cookies used on this website into four categories, based on their purpose and whether they are essential for the site to function.

Below is a detailed list of the cookies currently used on this website, including their purpose, provider, duration and category. This list may be updated as we add new features or change providers.

In addition to cookies set by us directly, we use a small number of third-party services that may set their own cookies on your device when you visit our site. These include:

• Google Analytics — to understand how visitors use the site. See Google's cookie technologies page.
• Google AdSense — only when marketing cookies are enabled, to display and measure advertising. Manage AdSense cookies.
• Cloudflare — for security, caching and DDoS protection. See Cloudflare's privacy policy.

We do not control these third-party cookies and recommend that you review the respective privacy policies of these providers. They use cookies to provide their services to us and to other websites.

In addition to cookies, this website may use the browser's localStorage and sessionStorage APIs to store small amounts of data on your device. These technologies work similarly to cookies but are not sent to our server on every request.

Local storage is used to:

• Remember your calculator preferences (e.g. last-used decimal places or example category).
• Cache the page layout and theme so the site loads faster on your next visit.
• Remember your cookie banner choice (this duplicates the cookie_consent value for resilience).

Local storage data is cleared when you clear your browser's site data. It is not used for tracking you across other websites.

When you first visit our website, a cookie banner appears at the bottom of the page. You can choose to:

• Accept all cookies — including analytics and (if applicable) marketing cookies.
• Accept essential cookies only — disables analytics, preference and marketing cookies.
• Manage preferences — lets you selectively enable or disable each category.

Your choice is stored in the cookie_consent cookie and remembered for 12 months. After that, the banner reappears so you can renew or change your preference.

Most web browsers allow you to control cookies through their settings. Below are links to the official instructions for the most popular browsers.

You can also use browser extensions such as the EFF Privacy Badger or Adblock Plus to manage cookies and trackers more granularly.

If you choose to disable cookies, the basic calculator will still work — your inputs are processed in your browser and do not depend on cookies. However, some features may be affected:

• The cookie consent banner will appear on every visit (since your preference can't be remembered).
• Local preferences (such as theme and recently used examples) won't persist between sessions.
• We won't be able to collect anonymous analytics about how the site is used — making it harder to improve the service.
• Cloudflare's security cookie won't be set, which may cause occasional verification challenges for your connection.

Cookies used on this website fall into two duration categories:

• Session cookies: Temporary cookies that are deleted when you close your browser. They are used to remember your activity during a single visit.
• Persistent cookies: Remain on your device for a set period (ranging from a few minutes to up to two years) or until you manually delete them. They are used to remember your preferences across visits.

Each cookie's specific duration is listed in the Cookies We Set table in Section 3.

We may update this Cookie Policy from time to time to reflect changes in our practices, technology, legal requirements or the third-party services we use.

When changes are made, we will revise the "Last updated" date at the top of this page. We encourage you to review this policy periodically to stay informed.

If a change is material — for example, a new cookie category or a new third-party processor — we will provide notice via the cookie banner or on the homepage at least 30 days before the change takes effect, where reasonably possible.

If you have any questions, concerns or requests regarding our use of cookies — or if you'd like to request a list of the specific cookies set on your device during your last visit — please contact us using the details below: