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We welcome your feedback and questions about our calculators and guides. Whether you found an error in a calculator, have an idea for a new one, or want to suggest an improvement, your input helps us do better.

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We aim to reply within a few working days, though we cannot guarantee a specific timeframe. We cannot give individual financial, tax or legal advice through correspondence, so please do not include sensitive personal or financial details in your message.

If a calculator result looks wrong, tell us the name of the calculator, the inputs you used, and the result you expected. Reviewing the methodology page can help you understand the assumptions behind each tool.

This page was last updated on 2026-08-09.