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We aim to answer genuine questions within two working days. Reports of a suspected calculation error are prioritised — we re-derive the figure from the published formula before replying, so those occasionally take a little longer but always get an explanation.

Four things: the calculator name, the exact inputs you entered, the result the page gave you, and the result you expected (with your own working if you have it). That lets us reproduce the case immediately instead of guessing.

No. We explain how a calculation works and will happily clarify a formula, but we cannot give personalised financial, tax, legal or medical advice. For decisions with real consequences, speak to a qualified adviser, accountant or clinician.

Please do — reader suggestions drive most of our roadmap. Tell us the calculation, who needs it and the situation it solves. Tools that are widely needed and can be computed transparently move to the front of the queue.

No. The site is funded by Google AdSense display ads, which are chosen by Google and kept separate from our content. We do not sell links, publish sponsored calculators or carry affiliate lending links — editorial independence is the reason the tools are worth trusting.

Your name, email, topic and message are stored solely so we can reply and, where relevant, fix the affected page. Messages arrive in our mailbox, are kept for up to 24 months, and are never sold or used for marketing. Ask us and we will delete your message sooner.