Contact us
Questions, corrections and bug reports are all welcome. Email is the fastest route and it reaches a human.
Best for corrections, bug reports and anything that needs a written answer.
[email protected]We aim to reply within a few business days.
Reporting a wrong result
If a calculator returns something that looks incorrect, including the four inputs, what you expected and what you got. Arithmetic corrections are prioritised over everything else.
Before you write
The answers most people are looking for
- Is there an API or a way to embed these? Not currently. The calculators are published as static pages; if there is enough interest an embeddable version is a possibility.
- Can I use the results in my own work? Yes. The numbers are yours — the output of a formula you supplied the inputs to. Attribution is welcome but not required.
- Do you keep any of the data I enter? No. Calculation is entirely client-side and nothing is transmitted or stored. See the privacy policy.
- Do you offer consulting or advisory work? No. This site is a set of tools, not a services business, and nothing here should be read as financial advice.
Advertising and privacy enquiries
For questions about the advertising served on this site — including how to opt out of personalised ads — the privacy and cookie policy covers the third-party vendors involved and the controls available to you. Requests relating to data held by those vendors must be directed to them, as we do not have access to it.