Time Calculators — Date
Clock and duration conversion: 24-hour to 12-hour, decimal hours, elapsed time, lap timing, and time since or until a moment. Decimal hours is the one payroll systems want, since 7 hours 30 minutes is 7.5 rather than 7.30.
All Time Calculators
Convert any 24-hour (military) time to 12-hour AM/PM format and vice versa.
Convert between hours:minutes format and decimal hours for payroll and billing.
Calculate total elapsed time between two date-times in days, hours, minutes, and seconds.
Calculate average, best, and worst lap times from a list of split times.
Calculate exact time elapsed since a specific date and time in years, days, hours.
Calculate the exact time remaining until a specific date and time down to the second.
Find the best meeting time across multiple time zones for international calls.
Online stopwatch and timer
About Time Calculators
Clock and duration conversion: 24-hour to 12-hour, decimal hours, elapsed time, lap timing, and time since or until a moment. Decimal hours is the one payroll systems want, since 7 hours 30 minutes is 7.5 rather than 7.30.
Whether you need to solve a one-time problem or verify your own calculations, these free tools cover the most common time scenarios. All results are computed in your browser — no data is sent to any server.
What You Can Calculate
This section includes 8 tools: 24 Hour to 12 Hour Converter, Decimal Hours Converter, Elapsed Time Calculator, Stopwatch Lap Time Calculator, Time Since Calculator, Time Until Calculator, World Time Meeting Planner, Stopwatch Timer. Each calculator is free to use with no signup required.