Use the form below to report an incorrect result, suggest a new calculator, or ask a question about any formula on this site.
Reporting a wrong result is the most useful message this site can receive. Every calculator here is built from a documented closed-form formula, and every default value and worked example was recomputed independently before publication. That means a genuine discrepancy is worth fixing quickly, and it is usually one of three things: a real arithmetic bug, a formula being applied outside the range it is valid for, or a rounding difference between this tool and whatever you compared it against.
To make a report actionable, include the page URL, the exact values you entered in each field, which mode the calculator was in if it has a discrete and continuous toggle, the result you saw, and the result you expected. With those five details a discrepancy can normally be reproduced on the first try. Without the inputs it usually cannot be reproduced at all, since almost every reported difference turns on one specific value.
Requests for a new calculator or topic page are welcome. The most useful ones name the specific formula or the situation you are trying to model, rather than just the topic, because that determines whether the request is a new page or a variation of an existing one. Several pages on this site began as exactly that kind of request.
Before writing in with a question about how a formula works, it is worth checking the page for that topic first. Each calculator page carries its own formula breakdown, a variable reference table, a step-by-step worked example with real numbers, and a frequently-asked-questions section covering the specific points that commonly cause confusion for that formula. The growth formula reference collects every rearrangement of the core equation in one place, and the worked examples page shows the same mathematics applied across finance, biology, and decay problems.
This site is maintained as an independent educational resource rather than a staffed support desk, so replies are not immediate. Messages are typically reviewed within a few business days, and corrections to a genuine calculation error are prioritised over everything else.
This form is a static template on the current build of the site. Nothing entered above is transmitted yet. Wiring it to a live inbox is a deployment-time step outside the scope of this page's content. See the privacy policy for how any information submitted here would be handled once that's connected.
Send the page URL, the exact inputs you entered, and the result you expected using the form below, and it will be checked against the formula shown on that page. Every calculator on this site is built from a documented closed-form formula, so a discrepancy is usually either a browser rendering issue or a genuine bug worth fixing quickly.
Yes, suggestions for new exponential growth or decay topics are welcome through the contact form below. Include the specific formula or use case you have in mind so it can be scoped accurately.
Each calculator page includes its own formula explanation, a worked example, and a frequently-asked-questions section covering common points of confusion for that topic. If a specific question isn't answered there, the contact form below reaches the site directly.
Messages are typically reviewed within a few business days. This is an independently maintained educational site rather than a staffed support desk, so response times can vary.