Add or subtract time values in hours, minutes, and seconds. Perfect for project planning, work hours, and scheduling.
Our time calculator helps you perform complex time calculations with ease. Whether you need to add work hours, subtract time durations, or calculate time spans, this tool has you covered.
Features:
There are 86,400 seconds in a day.
The concept of a 24-hour day was developed by the ancient Egyptians.
Atomic clocks are accurate to within a second over millions of years.
Time is one of our most valuable resources, yet calculating time differences, adding durations, or subtracting time values can be surprisingly challenging. Our free online time calculator simplifies these common tasks, helping you manage projects, track work hours, and plan schedules with precision.
Time is measured in standardized units that form the foundation of all time calculations:
Project managers frequently need to add time estimates for various tasks to determine overall project duration. Our calculator helps combine development time, testing periods, and buffer time to create realistic project timelines.
For hourly employees or freelancers, accurately calculating total work hours across multiple days or projects is essential for payroll and invoicing. Adding time segments ensures you're properly compensated for all work performed.
Event planners, meeting coordinators, and personal organizers use time subtraction to determine available slots in a schedule. Calculating the duration between events helps optimize time usage and prevent overbooking.
Travelers use time duration calculations to determine journey lengths, plan layovers, and adjust for time zones. Understanding travel time helps in making informed decisions about transportation options.
The measurement of time has evolved significantly throughout human history. Ancient civilizations used sundials, water clocks, and hourglasses. The mechanical clock was invented in medieval Europe, and the pendulum clock in the 17th century greatly improved accuracy. Today's atomic clocks, based on the vibrations of cesium atoms, are accurate to within a second over millions of years.
For other time and financial calculations, consider using our related utilities: