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Week Conversion Table
This comprehensive week conversion table shows how various units relate to weeks, a standard unit for measuring time periods. Use this reference for quick conversions between weeks and other common time units.
| Conversion | To Unit | Multiplier |
|---|---|---|
| Weeks to seconds | Seconds | 604800 |
| Weeks to milliseconds | Milliseconds | 604800000 |
| Weeks to microseconds | Microseconds | 604800000000 |
| Weeks to nanoseconds | Nanoseconds | 604800000000000 |
| Weeks to picoseconds | Picoseconds | 6.048e+17 |
| Weeks to minutes | Minutes | 10080 |
| Weeks to hours | Hours | 168 |
| Weeks to days | Days | 7 |
| Weeks to fortnights | Fortnights | 0.5 |
| Weeks to months | Months | 0.229984 |
| Weeks to years | Years | 0.0191654 |
| Weeks to decades | Decades | 0.00191654 |
| Weeks to centuries | Centuries | 0.000191654 |
| Weeks to millennia | Millennia | 1.91654e-5 |
This week conversion reference table provides accurate conversion factors for both SI units and commonly used time units. All values are based on internationally recognized standards for maximum precision in scientific and engineering applications.
What is a Week?
A week is a unit of time equal to seven days. It is the standard time period used for cycles of rest days in most parts of the world, mostly alongside—although not strictly part of—the Gregorian calendar. The days of the week were named after the classical planets in the Roman era, and this naming system has been widely adopted throughout Europe and its colonies.
The week is unique among time periods in that it is not directly related to any astronomical cycle. Instead, it is a conventional unit that has been used for thousands of years. Our week conversion tool helps you easily convert between weeks and other units. For example, 1 week equals exactly 7 days or 168 hours.
What is the SI of Week?
While the week is not an SI unit itself, it is accepted for use with the International System of Units (SI). The base SI unit for time is the second (s), and all other time units in the metric system are derived from the second. However, the week is a commonly used unit that can be expressed in terms of seconds:
- 1 week = 7 days
- 1 week = 168 hours
- 1 week = 10,080 minutes
- 1 week = 604,800 seconds
What are Weeks Used For?
Weeks are used in a wide range of applications across cultures, businesses, and personal life. As a standard time measurement unit, weeks provide a convenient way to organize schedules and plan events. Our time conversion tools help with various applications:
Work & Education
Standard work weeks (typically 5 days) and school schedules. For example, a full-time employee might work 40 hours per week, or a university semester might be 15 weeks long.
Health & Fitness
Tracking fitness programs, medication schedules, and health metrics. For example, many fitness programs recommend tracking progress over 8-12 week periods for optimal results.
Project Management
Planning project timelines and milestones. For example, a software development project might be planned in 2-week sprints using agile methodologies.
Travel & Tourism
Vacation planning and travel itineraries. For example, a European tour might be planned for 3 weeks to allow for adequate time to visit multiple countries.
Etymology and History
The concept of a seven-day week has ancient origins, with evidence of its use dating back to ancient Mesopotamia. The seven-day week is believed to have been based on the approximate quarter-phase cycle of the moon. The Romans adopted this system, associating each day with one of the seven classical planets, which gave rise to the names of the days in many languages.
The seven-day week was established throughout the Roman Empire by Emperor Constantine in the 4th century AD. This system was later adopted by Christianity and spread throughout Europe. The current names of the days in English are derived from a combination of Germanic and Roman influences, reflecting the cultural blending that occurred during the early medieval period. This historical continuity makes the week one of the most enduring time units in human history.
Frequently Asked Questions
Why is a week 7 days long?
The seven-day week has ancient origins, possibly based on the approximate quarter-phase cycle of the moon. This system was adopted by the Babylonians and later the Romans, who associated each day with one of the seven classical planets. The seven-day week was standardized throughout the Roman Empire and later adopted by Christianity, making it one of the most enduring time measurement systems in human history.
How accurate is the week as a time measurement?
The week is an exact unit of time defined as 7 days or 604,800 seconds. While not an SI base unit itself, it's accepted for use with the SI system. The precision of a week as a measurement is absolute, though when converting to astronomical units like months or years, approximations are used since these periods vary in length.
What's the difference between a week and a fortnight?
A week is 7 days long, while a fortnight is 14 days (2 weeks). The term "fortnight" comes from Old English, meaning "fourteen nights." Fortnights are commonly used in some English-speaking countries like the UK and Australia for pay periods and rental agreements, while weeks are more universally used for scheduling and planning.
How do I convert weeks to other time units?
Use our week conversion calculators above, or multiply by the appropriate conversion factor. For example, to convert weeks to days, multiply by 7; to convert weeks to hours, multiply by 168. For detailed instructions on converting weeks to specific units, visit our dedicated converter pages. Our tool also handles conversions to and from larger time periods like months and years.
What are common uses for week conversion?
Week conversion is essential in project planning (sprint durations), healthcare (medication schedules), education (semester planning), and business (payroll calculations). Whether calculating project timelines or converting vacation days to weeks, our week converter tool simplifies these everyday tasks for professionals and individuals alike.
How does week conversion differ from other time units?
The week is unique among time units because it's not based on any astronomical cycle, unlike days (Earth's rotation) or years (Earth's orbit). This makes it a purely conventional unit. All other time units in the metric system are derived from the second, the SI base unit, but weeks provide a convenient intermediate unit for human-scale time measurement.
Can I convert very small or very large measurements in weeks?
Yes, our week converter handles both extremely small and large measurements with precision. For very small periods, convert microseconds to weeks (1 µs = 1.6534e-12 week). For large periods, convert weeks to years or decades. Our smart rounding feature ensures readable results for all scales, from scientific measurements to historical timelines.
Is your week conversion tool free to use?
Yes, our week conversion calculator is completely free with no registration required. Simply enter your value, select your target unit, and get instant, accurate results. We believe precise time measurement conversion should be accessible to everyone, from students learning about time units to professionals working on complex project schedules.