Contact
We welcome questions, corrections, and partnership inquiries. If you think a calculator is wrong, please tell us the inputs you used — accuracy is the whole point of this site and we fix issues quickly.
Email is the fastest way to reach us. We read every message and reply to genuine questions and correction reports, though we cannot offer individualized financial advice. To keep the site private and tracking-free, we use plain email rather than a form that profiles visitors.
Reporting a calculation error
Correction reports get priority. To help us reproduce the issue in one pass, please include three things: the name of the calculator, the exact inputs you entered, and the result you expected (with a source or your own working, if you have one). Every formula we use is published on the methodology page, so you can also check the math directly — if our output disagrees with the published formula, that is a bug and we will fix it and update the page's review date, as described in our editorial policy.
What we can and cannot help with
We are glad to answer questions about how a calculator works, what a formula assumes, or why two tools give different answers. We cannot tell you whether to refinance, prepay, lease, buy, or how to invest — we do not know your situation, and this site is educational by design. For personal decisions, a qualified professional who can see your full picture is the right resource.
Partnerships & press
For advertising, affiliate, or press inquiries, use the same email above with a clear subject line. Note that partnerships never influence our calculations or editorial content — the terms are set out in our editorial policy — so proposals that require edits to results or reviews are declined as a matter of policy.