Plain-language notice
Privacy & advertising
This page explains what information the site uses, why it is used and the choices available to you.
Calculator scenarios
When you select “Save scenario”, the scenario is stored in your browser on that device. It is not sent to our server. You can clear it by clearing this site’s browser storage.
Advertising enquiries
If you submit the advertising form, we store the contact details, message and any artwork you choose to upload so we can assess and respond to the enquiry. Do not upload confidential client or tax information.
Google Ads measurement
When configured, optional Google measurement helps us understand whether an advertisement led to a useful action such as saving or printing a calculator result. It only loads after you accept optional cookies.
Google AdSense
Google AdSense code is included to verify site ownership and, once approved and configured, may display advertisements. Google and its partners may use cookies or similar technologies to select and measure ads, subject to Google’s controls and applicable consent requirements.
Your choices
You may choose “Essential only” in the cookie notice and continue using the calculator. You can also remove stored choices by clearing site data in your browser. To ask about an advertising enquiry or request access or correction, use the advertising enquiry form.
Last updated 19 August 2026.