About
About this calculator
Average Time Calculator is an independent utility for people who work with time data. It is built to be faster than a spreadsheet and clearer than a single average, with no accounts, ads, or server-side data collection.
Built and maintained by the Average Time Calculator team
What does this calculator do?
This calculator finds the mean of a set of durations or clock times. For durations, each value is converted to seconds, summed, and divided by the count. For clock times, the page uses circular averaging so values such as 23:50 and 00:10 average close to 00:00 instead of 12:00.
How are the calculations verified?
Every formula maps to a standard spreadsheet function or published definition. For example, Google's documentation defines the AVERAGE function as one that "returns the numerical average value in a dataset" (Google Support), which is the arithmetic this tool applies to durations. Clock time mode follows the definition of a circular mean from Wikipedia.
Free and private
No account, no sign-up, and no time data is uploaded or stored on a server.
Built for real data
Mixed formats, weighted records, CSV import, and shareable result links are supported.
Editorial standards
Every formula is checked against public references and spreadsheet functions. Errors reported by users are corrected and logged publicly.
Public and auditable
Every calculation is documented and mapped to standard spreadsheet functions, so anyone can review the parser, the circular-mean math, and every calculation.
How can I contact the team?
Open a GitHub issue to report bugs, request features, or ask about the math. The source code is also on GitHub for anyone to review.
GitHub issues
Report bugs, request features, or ask how the math works. Issues are public so anyone can see the answer.
Source code
Read the parser, circular-mean math, and every formula used on this page.
When was this page last updated?
Each update is recorded here so visitors can see the page is actively maintained and reviewed.
- Added sameAs entity links to schema, strengthened references section with authoritative citations, and added Contact and Terms of use sections.
- Added a verification guide, standard deviation and per-value deviation, day-unit input, open-source links, and three new FAQ entries.
- Initial public release with duration and clock time modes, weighted and running averages, CSV import and export, and shareable result links.