What is millisecond?
A millisecond is a unit of time equal to one thousandth of a second. It is used in computing, networking, audio and video processing, and measuring reaction times and signal latencies.
Real-world uses
Milliseconds are critical in computing for measuring network latency (ping times), database query performance, and real-time system response. Financial trading platforms measure order execution in milliseconds, and human reaction time averages about 250 ms.
History
The millisecond became a practical unit with the invention of precise mechanical chronographs in the 19th century. Its importance exploded with electronic computing, where operations occur in millisecond and sub-millisecond timescales.
Common mistakes
Confusing milliseconds with microseconds in performance profiling—they differ by a factor of 1,000. Also, assuming human perception cannot detect millisecond differences, when in fact audio delays above 10 ms are perceptible.
What is hour?
An hour is a unit of time equal to 60 minutes. It is the standard unit for time-of-day references, work schedules, travel durations, and billing periods across most global contexts.
Real-world uses
Hours are the primary unit for work schedules, flight durations, parking meters, and time zone offsets. Labour laws define maximum working hours, and electricity billing is based on kilowatt-hours of consumption.
History
The concept of dividing the day into 24 hours dates to ancient Egypt, where daylight and night were each split into 12 parts. These "hours" varied in length seasonally until mechanical clocks standardized equal hours in medieval Europe.
Common mistakes
Converting hours to minutes by multiplying by 100 instead of 60. Also, confusing 12-hour and 24-hour time formats—"12:00 AM" is midnight, not noon, which frequently causes scheduling errors.
When is this conversion used?
Converting millisecond to hour is useful in the time domain when comparing values across different measurement standards or applying formulas that require a specific unit.
Worked examples
1 millisecond = 2.777778e-07 hour
1 hour = 3,600 second
How to convert millisecond to hour
To convert millisecond to hour, multiply the value by 2.777778e-07.
To convert hour back to millisecond, multiply by 3,600,000.
Measurement standards
The SI second is defined as the duration of 9,192,631,770 periods of the radiation corresponding to the transition between two hyperfine levels of the ground state of the caesium-133 atom, maintained by the BIPM and national metrology institutes worldwide.
Did you know?
Earth's rotation is gradually slowing due to tidal friction with the Moon. To keep atomic time aligned with solar time, "leap seconds" have been inserted 27 times since 1972 — though they are scheduled to be abolished by 2035.
Quick reference: millisecond to hour
| millisecond | hour |
|---|---|
| 0.1 | 2.777778e-08 |
| 0.5 | 1.388889e-07 |
| 1 | 2.777778e-07 |
| 2 | 5.555556e-07 |
| 5 | 0.00000139 |
| 10 | 0.00000278 |
| 25 | 0.00000694 |
| 50 | 0.00001389 |
| 100 | 0.00002778 |
| 250 | 0.00006944 |
| 500 | 0.00013889 |
| 1,000 | 0.00027778 |
Common values
| millisecond | hour | |
|---|---|---|
| Blink of an eye | 300 millisecond | 0.00008333 hour |
| Average pop song | 210,000 millisecond | 0.05833333 hour |
| Feature film | 7,200,000 millisecond | 2 hour |
| One work day (8 hrs) | 28,800,000 millisecond | 8 hour |
| One calendar year | 3.153600e+10 millisecond | 8,760 hour |
Available Time units
More millisecond conversions
- Convert millisecond to second
- Convert millisecond to minute
- Convert millisecond to hour
- Convert millisecond to day
- Convert millisecond to week
- Convert millisecond to year (365 d)
- Convert millisecond to microsecond
- Convert millisecond to nanosecond
- Convert millisecond to century (100 yr)
Assumption: year is defined as 365 days and century values are approximate.