From seconds (s)
- Seconds to Minutess → min
- Seconds to Hourss → h
- Seconds to Dayss → d
- Seconds to Weekss → wk
Time conversion family
Time unit conversions
Time is the SI base quantity with dimension T; the second (s) is its SI base unit. This family represents elapsed duration, not a civil timestamp.
Five named units
Unit and factor reference
| Unit | Symbol | Factor to base | Relationship | Definition and variant |
|---|---|---|---|---|
| second | s | 1 | defined | The second is the SI base unit of time, defined by taking the fixed numerical value of the caesium-133 hyperfine transition frequency as 9,192,631,770 Hz. Named variant: Elapsed SI second; not second of plane angle or a leap-second event label. The base factor is exactly 1 by the family base-unit choice. |
| minute | min | 60 | conventional | The minute is a long-standing non-SI unit of time with 1 min = 60 s. Named variant: Minute of elapsed time; not minute of plane angle (′). The stated relationship is exact. |
| hour | h | 3600 | conventional | The hour is a long-standing non-SI unit of time with 1 h = 60 min = 3600 s. Named variant: Elapsed hour of fixed duration; not a clock reading affected by time-zone changes. The stated relationship is exact. |
| day | d | 86400 | conventional | The day in this duration family is 24 hours: 1 d = 24 h = 86,400 s. Named variant: Fixed 24-hour elapsed day; not a variable civil calendar day or solar-day observation. The stated fixed-duration relationship is exact. |
| week | wk | 604800 | conventional | This converter preserves the conventional seven-day week: 1 wk = 7 d = 604,800 s. Named variant: Fixed seven-day elapsed duration; not an ISO week-numbering calculation or business week. The arithmetic is exact for the documented seven-day convention. NIST SP 811 supports use of week intervals and the archived FIPS 4-1/ISO 8601:1988 record supplies the direct seven-day definition; that archive is historical evidence, not a current federal standard. |
Every ordered pair
All 20 time calculators
From minutes (min)
- Minutes to Secondsmin → s
- Minutes to Hoursmin → h
- Minutes to Daysmin → d
- Minutes to Weeksmin → wk
From hours (h)
- Hours to Secondsh → s
- Hours to Minutesh → min
- Hours to Daysh → d
- Hours to Weeksh → wk
From days (d)
- Days to Secondsd → s
- Days to Minutesd → min
- Days to Hoursd → h
- Days to Weeksd → wk
From weeks (wk)
- Weeks to Secondswk → s
- Weeks to Minuteswk → min
- Weeks to Hourswk → h
- Weeks to Dayswk → d
Evidence and review status
This family is machine-reviewed-pending-human. Automated checks verify structure, factor parity and source references; they do not constitute human or specialist approval.
Family assumptions and limits
- This family converts non-negative durations only; it does not handle dates, time zones, daylight-saving transitions, leap seconds, or calendar arithmetic.
- Minute, hour, and day use the fixed relationships stated in the current SI Brochure: 60 s, 3600 s, and 86,400 s.
- NIST SP 811 recognizes weeks as time intervals used outside its accepted-unit table; the direct seven-day definition is supported by an archived historical FIPS 4-1/ISO 8601:1988 record, not by a current federal standard.
Authoritative references
- The International System of Units (SI), 9th edition, version 4.01; Bureau International des Poids et Mesures; Section 2.3.1, second definition on p. 126; Section 4, Table 8, p. 140: 1 min = 60 s, 1 h = 3600 s, and 1 d = 86,400 s. The table does not list week.; accessed 2026-08-07
- The International System of Units (SI), NIST Special Publication 330, 2019 edition; National Institute of Standards and Technology; Section 2.3.1, SI base-unit definition of the second; Section 4, Table 8, minute/hour/day relationships. NIST's current SP 330 landing page identifies 2019 as the current edition.; accessed 2026-08-07
- NIST Guide to the SI, Chapter 5: Units Outside the SI; National Institute of Standards and Technology; Section 5.1.1 recognizes that time intervals may need to be expressed in weeks; Table 6 gives the exact minute, hour, and 86,400-second day relationships. NIST notes that SP 811 has not yet been updated for the 2019 SI revision, so current SI definitions remain sourced to SP 330/BIPM.; accessed 2026-08-07
- Archived FIPS PUB 4-1 adoption material: ISO 8601:1988 and Technical Corrigendum 1; National Institute of Standards and Technology legacy archive; Historical archived adoption material only, not a current federal standard. The reproduced ISO 8601:1988 text, section 3.16 on PDF page 10, defines a week as a seven-day period; section 3.17 separately defines a calendar week.; accessed 2026-08-07