Loading…
Calculators
Calculate the exact duration, elapsed time difference, and hours between two times or dates. Computes hours, minutes, seconds, and decimal hours with automatic overnight midnight rollover.
Follow these simple steps to get instant, accurate results directly in your browser:
Select or type the starting time, including hours, minutes, seconds, and AM/PM format.
Enter the ending time. If the interval crosses midnight into the next day, toggle the Next Day option.
Instantly copy the total elapsed duration, decimal hours for payroll, or total minutes.
The Free Time Duration Calculator is a precision utility engineered to calculate the exact duration, time difference, and elapsed interval between any two points in time. Whether you are tracking billable client hours, calculating work shift durations, analyzing sports lap timings, or planning flight itineraries, this tool computes precise totals down to hours, minutes, and seconds.
Unlike basic digital clocks that struggle with intervals crossing midnight (such as 10:00 PM to 6:30 AM), our algorithm automatically detects overnight rollovers and multi-day spans. It also provides comprehensive conversions into decimal hours (essential for payroll and invoicing), total minutes, and total seconds.
Operating 100% inside your web browser using high-precision JavaScript Date arithmetic, your scheduled times and personal agenda data remain strictly private and never touch an external server.
Accurately calculates time spans that begin in the evening and finish the next morning.
Converts hours and minutes into standard decimal numbers for payroll and spreadsheet reporting.
Real-time client-side calculation with instant updates as you type or adjust sliders.
All calculations execute locally in your browser with zero data telemetry.
Convert start and end times into billable decimal hours (e.g. 7 hours 45 mins = 7.75 hrs) for billing software.
Accurately compute total hours worked across day and night shifts, deducting break intervals.
Calculate layovers, total flight spans, and driving durations across different timeframes.
Explore complementary utilities for your workflow
Find days between dates or add/subtract from a date.
Live countdown to any event or date.
Countdown timer and stopwatch with alarm and lap times.
Calculate exact age from birthdate to today.