Printable chart
Time Conversion Chart
Printable time conversion chart for milliseconds, seconds, minutes, hours, days, weeks and years. Print this table or use the API and calculators for custom decimal precision.
Time
Core conversion table
| Input | Equivalent | Unit pair |
|---|---|---|
| 1000 milliseconds | 1 seconds | ms -> s |
| 60 seconds | 1 minutes | s -> min |
| 60 minutes | 1 hours | min -> h |
| 24 hours | 1 days | h -> day |
| 7 days | 1 weeks | day -> week |
| 365 days | 0.999315537303 years | day -> year |
Guide & details
How to use this chart
Use the table for quick checks, classroom handouts and desk references. For values not shown here, open the converter or call the API with your own value, from unit and to unit.
Best uses for this chart
The Time Conversion Chart is built as a quick reference after the table, so the printable conversion values stay first and the explanatory content stays below the core task.
- Simple duration math for logs, timers, schedules, support tickets and spreadsheet cleanup.
- Converting fixed-duration units before using a more precise calendar calculator for real dates.
- Keeping calendar assumptions visible when months or years are involved.
Chart accuracy notes
- Second, minute, hour, day and week conversions are fixed-duration conversions.
- Month and year conversions are approximate duration factors; use the date-difference calculator for real calendar dates.
Common chart mistakes
- Do not use approximate month or year conversions for legal deadlines, birthdays, billing cycles or contracts.
- For elapsed calendar dates, use date-difference tools instead of fixed duration conversion factors.
- Keep timezone and daylight-saving changes separate from simple duration math.
Next steps from this reference
- Use date-difference tools for calendar intervals.
- Use duration tools for logs and timers.
- Keep timezone work separate from fixed-duration conversion.