Contact us

We read every message. The fastest way to reach us is email:

[email protected]

What to include

• Bug or math error: the calculator you used, the values you entered, the result you got, and the result you expected. A share link (which encodes your inputs) is the most helpful thing you can send.
• Calculator request: what decision you're trying to make and what existing tools get wrong about it.
• Data correction: the page, the figure you believe is wrong, and a link to a better source.

We typically respond within a few business days. Please note that we cannot provide personal financial advice — see our Terms of Use.