Report a calculation error
Found a number that looks wrong? Tell us — include the calculator, the exact times/rate you entered, and what you expected. We publish corrections; see our methodology page for how we test.
Privacy questions
Questions about what we collect (very little — see our privacy policy) or a request to delete an email address you gave us.
General feedback
Anything else — feature ideas, broken links, unclear copy.
Email: contact@sumhours.com. Used for all three routes above; a single honest inbox beats three routes to a form that silently fails.