Time Calculator

Time math is base-60, not base-10—which trips up even experienced professionals. 1.5 hours is 1 hour 30 minutes, not 1 hour 50 minutes. Our Time Calculator handles all time arithmetic: adding and subtracting hours/minutes/seconds, converting between decimal and standard time formats, and calculating total durations for time sheets, cooking, workouts, and project tracking. Three modes: Add/Subtract Time (combine multiple durations or find difference between two times), Duration Between Two Times (calculate elapsed time handling AM/PM and midnight rollover), and Convert Time Formats (switch between HH:MM:SS, decimal hours, decimal minutes, total seconds). The calculator handles midnight crossing automatically (11:30 PM to 1:15 AM = 1 hour 45 minutes) and includes a decimal time conversion cheat sheet for common minute values (6 min = 0.1 hours, 15 min = 0.25 hours, 30 min = 0.5 hours, 45 min = 0.75 hours). Perfect for payroll, cooking, fitness training, project management, travel planning, medication scheduling, sleep tracking, and study schedules.

Time Calculator is optimized for fast browser-based use, so you can test multiple scenarios in seconds.