Microsecond is 0.000001 second units.
Microseconds to Milliseconds Converter — us to ms
Convert Microsecond (us) to Millisecond (ms) using the exact conversion factor (1 microsecond = 0.001 millisecond). See the formula, worked examples, and conversion table.
Microseconds to Milliseconds converter
Converter
Time Converter
Convert SI time, civil time, historical durations, months, and years.
Context values
Some unit families need one extra value for a physically accurate result.
Millisecond is 0.001 second units.
Result = input x 1e-6 / 0.001.
Months and years use the average Gregorian year.
Reserved above the conversion cards and below the converter.
About Converting Microseconds to Milliseconds
Microsecond and Millisecond are both everyday units of duration, and converting between them is one of the most routine calculations there is — scheduling, project planning, and billing all depend on it. Specifically: Microsecond is 0.000001 second units, and millisecond is 0.001 second units.
Formula
milliseconds = microseconds × 0.001
This factor comes from each unit's defined relationship to the category's base unit: 1 microsecond equals 0.000001 base units, and 1 millisecond equals 0.001 base units, so dividing one by the other gives the direct microsecond-to-millisecond factor of 0.001.
Simple example
1 us × 0.001 = 0.001 ms
1 microsecond = 0.001 milliseconds.
Real-world example
24 us × 0.001 = 0.024 ms
24 microseconds = 0.024 milliseconds.
Conversion table
| Microsecond (us) | Millisecond (ms) |
|---|---|
| 1 us | 0.001 ms |
| 7 us | 0.007 ms |
| 24 us | 0.024 ms |
| 30 us | 0.03 ms |
| 100 us | 0.1 ms |
| 365 us | 0.365 ms |
Reverse conversion: Millisecond to Microsecond
0.001 ms × 1000 = 1 us
0.001 milliseconds = 1 microsecond.
microseconds = milliseconds × 1000
For a page dedicated to this direction, see Millisecond to Microsecond.
Understanding the Microsecond (us)
Microsecond is 0.000001 second units.
Understanding the Millisecond (ms)
Millisecond is 0.001 second units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many milliseconds are in 1 microsecond?
1 microsecond equals 0.001 milliseconds, using the exact defined conversion factor rather than an estimate.
How do I convert microsecond to millisecond?
Multiply the microsecond value by 0.001. The converter above does this instantly to whatever precision you set.
How do I convert millisecond back to microsecond?
Use the reverse factor: 1 millisecond equals 1,000 microseconds. You can also use the swap control in the converter above to flip the direction instantly.
What is a microsecond?
Microsecond (us) is a unit of time.
What is a millisecond?
Millisecond (ms) is a unit of time.
Is the microsecond to millisecond conversion exact?
Yes. Both microsecond and millisecond are defined by fixed standards rather than physical artifacts, so the factor of 0.001 used above is exact to as many digits as you choose to display.