1. Data you enter into the calculator
2. What we collect
We do not operate user accounts, mailing lists, contact databases or first-party analytics. We do not ask you for your name, email address, phone number, postal address or payment details anywhere on this site.
Like virtually every website, our hosting provider automatically records standard server request logs, which may include your IP address, browser user-agent, requested URL, referring page and timestamp. These logs are generated by the hosting infrastructure for security and reliability purposes, are not linked to any identity by us, and are not used for profiling.
If you email us via the address on our contact page, we obviously receive whatever you choose to put in that email. We use it only to answer you, and we do not add you to any list.
3. Advertising and Google AdSense
This site is free and is funded by display advertising. We use Google AdSense, a service operated by Google LLC and, for users in the European Economic Area, Google Ireland Limited.
- Third-party vendors, including Google, use cookies to serve ads based on your prior visits to this website or other websites.
- Google's use of advertising cookies enables it and its partners to serve ads to you based on your visit to this and/or other sites on the internet.
- Google uses the DoubleClick DART cookie and similar identifiers for ad serving and frequency capping.
- Third-party advertising networks and exchanges other than Google may also serve advertising on this site and may set their own cookies. We do not control those cookies.
You can review Google's own explanation of how it uses information from sites that use its services at policies.google.com/technologies/partner-sites.
If you are in a region that requires it, you will be shown a consent notice before any non-essential advertising cookie is set, and you can change or withdraw that choice at any time.
4. Cookies used on this site
| Cookie / technology | Set by | Purpose | Type |
|---|---|---|---|
DoubleClick DART / IDE | Serving and measuring display advertising, frequency capping | Advertising, third party | |
__gads, __gpi | Ad selection and reporting on this site | Advertising, third party | |
| Consent record | Google Consent Management | Remembers your cookie consent choice so you are not asked repeatedly | Essential |
We set no first-party cookies of our own. The calculator itself requires no cookies and no local storage to function.
5. How to opt out
You have several independent ways to limit or stop personalised advertising:
- Opt out of personalised Google advertising at Google Ads Settings.
- Opt out of many third-party vendors at once at optout.aboutads.info (Digital Advertising Alliance) or optout.networkadvertising.org (Network Advertising Initiative).
- Block or delete cookies in your browser settings. The calculator will continue to work perfectly with all cookies blocked.
- Use your browser's private or incognito mode.
Opting out of personalised advertising does not remove advertising; it means the ads you see are less relevant to you.
6. Your rights
European Economic Area and United Kingdom (GDPR)
Where the GDPR applies, our lawful basis for the limited server-log processing described above is legitimate interest in operating a secure website. The lawful basis for advertising cookies is your consent, which you may withdraw at any time. You have the right to access, rectify, erase, restrict and object to processing of your personal data, the right to data portability, and the right to lodge a complaint with your national supervisory authority.
California (CCPA / CPRA)
We do not sell your personal information and we do not share it for cross-context behavioural advertising in exchange for money. California residents have the right to know what personal information is collected, to request deletion, to correct inaccurate information, and to opt out of sale or sharing. Because we hold no personal information about you beyond transient server logs, there is generally nothing for us to disclose or delete, but you may still submit a request through our contact page and we will respond within the statutory period.
Other US states
Residents of Virginia, Colorado, Connecticut, Utah and other states with comprehensive privacy laws have broadly equivalent rights and may use the same contact route.
7. Children's privacy
This site is intended for a general adult audience and is not directed at children under 13. We do not knowingly collect personal information from children. If you believe a child has provided us with personal information, contact us and we will delete it.
8. Changes to this policy
We may update this policy to reflect changes in the law or in the services we use. The date at the top of this page always shows when it was last revised. Material changes will be highlighted on the homepage.
9. Contact
All privacy enquiries, including access, correction, deletion and opt-out requests, are handled through our contact page. We aim to respond within three business days, and always within any statutory deadline that applies to your request.