Time tools
Time Converter
Convert small time intervals, calendar periods, work scheduling units, and scientific time scales.
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Instant results1 second [s] = 1000 millisecond [ms]
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View all categories →All time units
| Unit | Symbol | Conversion factor | Quick links |
|---|---|---|---|
| second | s | Base unit | Reference unit |
| millisecond | ms | 1 millisecond [ms] = 0.001 s | to s from s |
| microsecond | µs | 1 microsecond [µs] = 0.000001 s | to s from s |
| nanosecond | ns | 1 nanosecond [ns] = 1E-9 s | to s from s |
| minute | min | 1 minute [min] = 60 s | to s from s |
| hour | h | 1 hour [h] = 3600 s | to s from s |
| day | d | 1 day [d] = 86400 s | to s from s |
| week | wk | 1 week [wk] = 604800 s | to s from s |
| fortnight | fortnight | 1 fortnight [fortnight] = 1209600 s | to s from s |
| month (average) | mo | 1 month (average) [mo] = 2629746 s | to s from s |
| quarter (average) | qtr | 1 quarter (average) [qtr] = 7889238 s | to s from s |
| year (average Gregorian) | yr | 1 year (average Gregorian) [yr] = 31556952 s | to s from s |
| common year | common yr | 1 common year [common yr] = 31536000 s | to s from s |
| leap year | leap yr | 1 leap year [leap yr] = 31622400 s | to s from s |
| decade | dec | 1 decade [dec] = 315569520 s | to s from s |
| century | century | 1 century [century] = 3155695200 s | to s from s |
| millennium | millennium | 1 millennium [millennium] = 31556952000 s | to s from s |
| sidereal day | sidereal day | 1 sidereal day [sidereal day] = 86164.0905 s | to s from s |
Accuracy and Sources
Time factors use second as the reference unit. Average month and average year values are approximate calendar references. Content was last reviewed on 2026-05-21. For safety-critical work, confirm results against the relevant official standard.
How time conversion works
Time conversion changes a measurement from one unit to another using a fixed factor or formula. Use the calculator above for instant results, then check the table and related converter links for common values.
Frequently Asked Questions
View sitemap →What is the base unit for time?
The reference base unit used on this page is s.
Are these time conversions accurate?
Yes, the calculator uses the conversion factors listed on the page. For critical work, verify results with an authoritative standard.