Free tools

Quick calculators for the sums that come up around working hours. Free, nothing to sign up for, and they run entirely in your browser.

How the calculators work

Type in your numbers and the result updates as you go. Nothing you enter is saved or sent anywhere: close the tab and it is gone. Each calculator explains the formula it uses under the result, so you can check it, and the guides go through the same sums step by step. If you find yourself doing the same calculation every week, Clockflux keeps the running totals for you.