Privacy
The calculators run entirely in your browser. Nothing you type is sent to us.
What we collect
We use privacy-friendly, cookie-free analytics to count visits and which calculators are used. It records no personal details and does not track you across other sites. Our web server keeps a standard access log for security, deleted after a limited period.
Saved plans
Plans you save are stored in your own browser (local storage) and never sent to us. A share link holds your inputs in the address itself, so only people you send it to see them.
Advertising
This site may show Google ads to stay free. Google may use cookies to show ads; you can manage this in your Google ad settings.
If you email us, we keep your message to reply. We never sell or share it.
Your rights
Under the Privacy Act 2020 you can ask to see or correct information we hold about you. Email [email protected].
Crucible Investments Limited, New Zealand. Updated 12 November 2026.