Calculate Average Clock Time

Yes. All time calculations happen entirely in your browser using client-side JavaScript. Your time lists never leave your device or get uploaded to any server.

Yes, this tool is 100% free with no limits on the number of times you can process. Calculate as many time averages as you need.

Yes, once the page loads, you can calculate average times without an internet connection. All processing happens locally in your browser.

Clock times are cyclical – 23:59 is right next to 00:00, not 24 hours away. The circular mean treats each time as an angle on a 24-hour clock, sums unit vectors, then converts the resulting angle back to a time. For times like 23:00 and 01:00 this gives the correct answer (00:00) where a linear arithmetic mean gives 12:00 – exactly the wrong side of the clock.

24-hour format only: HH:MM (e.g. 08:30) or HH:MM:SS (e.g. 14:45:30). Leading zeros are optional for single-digit hours. Hours must be 0-23, minutes and seconds 0-59. Out-of-range values are skipped.

No. Convert 12-hour times to 24-hour first (e.g. 2:30 PM → 14:30, 11:00 PM → 23:00). The tool rejects anything outside the 24-hour range.

When the time list averages to two points exactly 12 hours apart (e.g. 06:00 and 18:00, or 00:00 and 12:00), the circular mean vector has zero magnitude – meaning the average is mathematically undefined. The tool detects this and falls back to the linear mean, with an info toast so you know why.

Some use cases genuinely want the linear average (e.g. averaging durations rather than clock positions). The stats line shows both so you can pick the right one for your context.

Shift midpoint calculations, average login times, mean meeting times, preferred appointment slots, or any scheduling analysis across multiple entries. The circular mean is correct for all of these.

Yes. HH:MM:SS input is parsed to full second precision. The output preserves seconds in the circular mean when the input supplied them.