This calculator allows you to easily add and manage time intervals in a table, using the hours:minutes:seconds format. Whether you're tracking work hours, recording running times, or measuring any other type of elapsed time, this calculator can help.

This online calculator allows students to input their current grades for each course and displays the current average. It then calculates the number of B's needed to reach a B, if the current average is below a B, as well as the number of A's needed to reach both a B and an A.