Time Duration Calculator

Working out the exact hours and minutes between two clock times sounds trivial until the span crosses midnight. This tool handles that case cleanly, which makes it practical for logging freelance project hours, measuring employee shift lengths in 2026, or just settling how long an event actually ran. Precise durations feed directly into dependable scheduling, accurate billing, and clean payroll for the 2026 fiscal year.

The math starts by converting both the start and end times into a single unit, usually the number of minutes elapsed since a reference point such as midnight. When the end time lands earlier than the start time, that signals an overnight span, so 24 hours (1440 minutes) are added to the end value before the subtraction happens. The resulting difference in minutes is then translated back into hours and leftover minutes to give a readable answer.

A quick word on accuracy: AM/PM selection is the single most common place errors creep in, so verify it before trusting a result. The calculation also assumes one unbroken stretch inside a 24-hour cycle and makes no allowance for breaks or pauses unless you build them into the input times yourself. Durations that genuinely run across several days fall outside its scope, since it reports only the portion within a single 24-hour window and disregards the day count entirely.