About HowManyHours.com

The site is operated by Techbuddie Sulutions, Portugal. The domain has been in continuous use since 2009; the current site is a rebuild launched in 2026 that replaced an older travel-distance site.

Contact: hello@howmanyhours.com.

Each tool page follows the same order: the calculator, a one-paragraph answer, a "How this is calculated" section with the formula written out, and questions people actually ask. The method is on the page because a number without its method is not checkable.

Arithmetic lives in small, tested modules. Time-of-day, overtime banding, daylight-saving handling, Easter dates, great-circle distance and time-zone offsets each have unit tests covering the cases that go wrong in practice — overnight shifts, the two weeks when the US and Europe are out of step, a shift across a clock change.

Two deliberate models exist side by side and each page says which it uses: the time card counts wall-clock hours, because that is what a timesheet says; the hours-between and countdown tools count real elapsed time, because that is what actually passed.

Nothing you enter is sent to a server. Tool state lives in the page address so you can bookmark or share a result; that is the only place it exists. Analytics, when enabled, records the page path only — never the part of the address that holds your entries. Details are in the privacy policy.