Millisecond is 0.001 second units.
Milliseconds to Microseconds Converter — ms to us
Convert Millisecond (ms) to Microsecond (us) using the exact conversion factor (1 millisecond = 1,000 microsecond). See the formula, worked examples, and conversion table.
Milliseconds to Microseconds 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.
Microsecond is 0.000001 second units.
Result = input x 0.001 / 1e-6.
Months and years use the average Gregorian year.
Reserved above the conversion cards and below the converter.
About Converting Milliseconds to Microseconds
Millisecond and Microsecond 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: Millisecond is 0.001 second units, and microsecond is 0.000001 second units.
Formula
microseconds = milliseconds × 1000
This factor comes from each unit's defined relationship to the category's base unit: 1 millisecond equals 0.001 base units, and 1 microsecond equals 0.000001 base units, so dividing one by the other gives the direct millisecond-to-microsecond factor of 1000.
Simple example
1 ms × 1000 = 1,000 us
1 millisecond = 1,000 microseconds.
Real-world example
24 ms × 1000 = 24,000 us
24 milliseconds = 24,000 microseconds.
Conversion table
| Millisecond (ms) | Microsecond (us) |
|---|---|
| 1 ms | 1,000 us |
| 7 ms | 7,000 us |
| 24 ms | 24,000 us |
| 30 ms | 30,000 us |
| 100 ms | 100,000 us |
| 365 ms | 365,000 us |
Reverse conversion: Microsecond to Millisecond
1 us × 0.001 = 0.001 ms
1 microsecond = 0.001 milliseconds.
milliseconds = microseconds × 0.001
For a page dedicated to this direction, see Microsecond to Millisecond.
Understanding the Millisecond (ms)
Millisecond is 0.001 second units.
Understanding the Microsecond (us)
Microsecond is 0.000001 second units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many microseconds are in 1 millisecond?
1 millisecond equals 1,000 microseconds, using the exact defined conversion factor rather than an estimate.
How do I convert millisecond to microsecond?
Multiply the millisecond value by 1000. The converter above does this instantly to whatever precision you set.
How do I convert microsecond back to millisecond?
Use the reverse factor: 1 microsecond equals 0.001 milliseconds. You can also use the swap control in the converter above to flip the direction instantly.
What is a millisecond?
Millisecond (ms) is a unit of time.
What is a microsecond?
Microsecond (us) is a unit of time.
Is the millisecond to microsecond conversion exact?
Yes. Both millisecond and microsecond are defined by fixed standards rather than physical artifacts, so the factor of 1000 used above is exact to as many digits as you choose to display.