Before you write
A few of the most common enquiries have faster answers here than by email.
I think a calculator is giving the wrong result
Please include the exact input values you used and the output you expected. Almost all reported discrepancies come down to a documented model limitation — each tool lists what it does not account for at the foot of the page — but genuine bugs do occur and we fix them within days.
Will you review my product?
We do not run product reviews or comparison rankings, and we hold no affiliate relationships. If your product embodies an interesting mechanism, a technical explanation is welcome as research background — but it will not become an endorsement.
Can I republish or quote a guide?
Short excerpts with a link and attribution are fine without asking. Full republication, translation or use in commercial training material requires written permission — ask, and we usually say yes for educational uses.
Can you advise me on my own situation?
No. We publish educational research, not personalised advice, and we are not your adviser. We can point you to the relevant guide and model, but decisions specific to your circumstances need a professional who can see the whole picture.
How do I make a data or privacy request?
Select the privacy option above. Note that we hold very little: no accounts, no profiles, and no calculator inputs — those never leave your browser. Newsletter subscribers can be exported or erased on request. See the privacy page.
Direct routes
| Purpose | Route | Response target |
|---|---|---|
| Corrections | Form above, topic "correction" | 5 working days to verify |
| Commercial & advertising | Form above, or the media kit | 2 working days |
| Privacy & data requests | Form above, topic "privacy" | 30 days statutory |
| Press | Form above, topic "press" | 2 working days |
Messages are stored only for the purpose of replying and are deleted after twelve months. We do not add correspondents to marketing lists.