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We read every message. Whether you spotted a calculator that does not look right, found a confusing explanation, have a question about a result, or want to suggest a tool we should build next, we would love to hear from you.
Editorial contact: Sarah Mitchell (author) · Review: James Carter, CPA · Last reviewed September 28, 2026.
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The more context you give us, the faster we can help. If you are asking about a specific result, tell us which calculator you used and the numbers you entered. If you are reporting an error on a page, a link to the page is enough for us to find it.
Before you ask, please know that our calculators run entirely in your browser and we do not store the figures you enter. You can confirm how we handle data on our Privacy Policy page, and the ground rules for using the site are on our Terms of Use page. Our Disclaimer explains how far calculator estimates can be relied on.