Common converters
Time Converter
Convert seconds, minutes, hours, days, weeks and years.
Result
60 min
1 h = 60 min
All units for this value
| Unit | Symbol | Value |
|---|---|---|
| Nanosecond | ns | 3.60000e+12 |
| Microsecond | µs | 3600000000 |
| Millisecond | ms | 3600000 |
| Second | s | 3600 |
| Minute | min | 60 |
| Hour | h | 1 |
| Day | d | 0.0416667 |
| Week | wk | 0.00595238 |
| Fortnight | fortnight | 0.00297619 |
| Month (30 days) | mo | 0.00138889 |
| Year (365 days) | yr | 0.000114155 |
| Julian year (365.25 days) | a | 0.000114077 |
| Decade (3652.5 days) | decade | 0.0000114077 |
| Century (36525 days) | century | 0.00000114077 |
About this calculator
Time units range from nanoseconds used in computing to years used in planning, and switching between them by hand invites arithmetic mistakes. This converter turns any duration into seconds internally and then back out into whichever unit you need, covering everything from a blink-length nanosecond to a multi-year Julian period.
How it works in plain English
Because clocks, calendars, and scientific measurements all describe the same underlying quantity — duration — every unit here can be expressed as a count of seconds. The converter multiplies your entered value by the number of seconds in your chosen source unit, then divides by the number of seconds in your target unit. This single shared anchor avoids the need for a separate formula between every possible pair of units.
Calendar-based units need a simplifying rule, since months and years don't have one fixed length in reality. For everyday conversions, this tool treats a month as exactly 30 days and a year as exactly 365 days, which keeps results predictable and easy to check by hand. For scientific or astronomical work, it also offers the Julian year, a fixed 365.25-day definition used so that long time spans stay consistent regardless of leap years.
Enter a number in the from field, choose the from and to units, and the converted duration appears immediately, alongside a table showing the same length of time in every unit at once. A precision selector controls how many decimal places are shown, and a swap control quickly reverses the conversion direction.
The formula
- value_in_target = value_in_source × (source seconds) ÷ (target seconds)
- 1 minute = 60 s
- 1 hour = 3600 s
- 1 day = 86,400 s
- 1 week = 604,800 s
- 1 fortnight = 1,209,600 s
- 1 month (30 days) = 2,592,000 s
- 1 year (365 days) = 31,536,000 s
- 1 Julian year (365.25 days) = 31,557,600 s
Worked example
Suppose a project is estimated to take 90 days and you want that in weeks. First convert to seconds: 90 days × 86,400 s = 7,776,000 s. Then divide by the number of seconds in a week: 7,776,000 ÷ 604,800 = 12.857 weeks.
Typing 90 into the days field with weeks selected as the target gives 12.857 weeks instantly, and the accompanying table shows the same 90 days equals about 2,160 hours, 12.857 weeks, and 3 months under the 30-day-month rule used here, all calculated from the same entered value.
Common time unit lengths in seconds
| Unit | Length in seconds |
|---|---|
| 1 nanosecond | 0.000000001 |
| 1 millisecond | 0.001 |
| 1 second | 1 |
| 1 minute | 60 |
| 1 hour | 3,600 |
| 1 day | 86,400 |
| 1 week | 604,800 |
| 1 fortnight | 1,209,600 |
| 1 month (30 days) | 2,592,000 |
| 1 year (365 days) | 31,536,000 |
| 1 Julian year (365.25 days) | 31,557,600 |
Standard and calendar-based definitions used in this converter
Frequently asked questions
Why is a month treated as exactly 30 days?
Real calendar months vary from 28 to 31 days, so there's no single exact conversion factor for 'a month.' Using a fixed 30-day approximation keeps the math simple, consistent, and easy to reproduce by hand, though it won't exactly match a specific named calendar month like February or July.
What is a Julian year and why does it differ from a regular year?
A Julian year is defined as exactly 365.25 days, or 31,557,600 seconds, and is used in astronomy and some scientific fields to keep long time spans consistent despite leap years. The plain 'year' option here instead uses 365 days, matching common non-leap-year everyday counting.
Does this converter account for leap years?
No. It uses fixed-length approximations for months and years rather than tracking actual calendar dates or leap-year rules. For precise date arithmetic across real calendars, a dedicated date calculator that understands specific months and years would be more accurate than fixed-length unit conversion.
What is a fortnight?
A fortnight is a traditional unit equal to two weeks, or 14 days, which works out to 1,209,600 seconds. It's less common in everyday use in some regions but still appears in contracts, subscriptions, and some scheduling contexts, so it's included alongside the more familiar units.
How do I convert a very small duration like nanoseconds to hours?
Just choose nanoseconds as the from unit and hours as the to unit, then type your value; the converter handles the very large scale difference automatically. Because the underlying anchor is seconds, extremely small and extremely large units convert through the same consistent multiply-then-divide process without separate formulas.
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