Convert Microseconds (µs) to Milliseconds (ms)

1 microsecond equals 0.001 milliseconds.

Formula: ms = µs × 0.001

Microsecond to Millisecond Converter

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How to Convert Microsecond to Millisecond

1 microsecond = 0.001 milliseconds

Millisecond = Microsecond × 0.001

Example: 1 µs × 0.001 = 0.001 ms

Reverse Conversion

To convert milliseconds back to microseconds:

  • Remember, 1 millisecond equals 1000 microseconds.
  • To convert 0.001 ms to µs, multiply 0.001 x 1000, resulting in 1 µs.

Common Microsecond to Millisecond Conversions

Microsecond to Millisecond (Part 1)
Microsecond Millisecond Actions
1 microsecond 0.001 milliseconds
5 microseconds 0.005 milliseconds
10 microseconds 0.01 milliseconds
25 microseconds 0.025 milliseconds
Microsecond to Millisecond (Part 2)
Microsecond Millisecond Actions
50 microseconds 0.05 milliseconds
100 microseconds 0.1 milliseconds
500 microseconds 12 milliseconds
1000 microseconds 1 millisecond

Microseconds to milliseconds Conversion Table

Reference table with common microseconds to milliseconds conversions. All values calculated with high precision.

Microseconds to Milliseconds Table
0.1 to 500

Microseconds Milliseconds Actions
0.1 µs 0.0001 ms
14 µs 0.00025 ms
12 µs 0.0005 ms
1 µs 0.001 ms
2 12 µs 0.0025 ms
5 µs 0.005 ms
10 µs 0.01 ms
25 µs 0.025 ms
50 µs 0.05 ms
100 µs 0.1 ms
250 µs 14 ms
500 µs 12 ms

Microseconds to Milliseconds Table
1000 to 1 × 108

Microseconds Milliseconds Actions
1000 µs 1 ms
2500 µs 2 12 ms
5000 µs 5 ms
10000 µs 10 ms
25000 µs 25 ms
50000 µs 50 ms
100000 µs 100 ms
250000 µs 250 ms
500000 µs 500 ms
1000000 µs 1000 ms
2500000 µs 2500 ms
5000000 µs 5000 ms
10000000 µs 10000 ms
2.5 × 107 µs 25000 ms
5 × 107 µs 50000 ms
1 × 108 µs 100000 ms

Milliseconds to Microseconds Table
0.0001 to 12

Milliseconds Microseconds Actions
0.0001 ms 0.1 µs
0.00025 ms 14 µs
0.0005 ms 12 µs
0.001 ms 1 µs
0.0025 ms 2 12 µs
0.005 ms 5 µs
0.01 ms 10 µs
0.025 ms 25 µs
0.05 ms 50 µs
0.1 ms 100 µs
14 ms 250 µs
12 ms 500 µs

Milliseconds to Microseconds Table
1 to 100000

Milliseconds Microseconds Actions
1 ms 1000 µs
2 12 ms 2500 µs
5 ms 5000 µs
10 ms 10000 µs
25 ms 25000 µs
50 ms 50000 µs
100 ms 100000 µs
250 ms 250000 µs
500 ms 500000 µs
1000 ms 1000000 µs
2500 ms 2500000 µs
5000 ms 5000000 µs
10000 ms 10000000 µs
25000 ms 2.5 × 107 µs
50000 ms 5 × 107 µs
100000 ms 1 × 108 µs

Definition of Millisecond

Definition

ms — The millisecond is a unit of time equal to one thousandth of a second (0.001 s or 10⁻³ s). It is widely used in computing (response times, frame rates), sports timing (sprint finishes, lap times), telecommunications (network latency), and neuroscience (nerve impulse timing).

The millisecond follows standard SI prefix rules: the "milli-" prefix means 1/1,000.

Exact factor
1 ms = 0.001 s (exact)
Examples
  • 1,000 ms = 1 second
  • 16.67 ms = 1 frame at 60 fps
  • 100 ms = typical human reaction time

Frequently Asked Questions

How many milliseconds are in one microsecond?

One microsecond equals 0.001 milliseconds. To convert, multiply the microsecond value by 0.001. For the reverse, divide the millisecond value by 0.001 (or multiply by 1000).

What is 100 microseconds in milliseconds?

100 microseconds = 0.1 milliseconds. This is one of the most commonly searched conversions for this pair.

Is the microsecond-to-millisecond conversion exact?

Yes. The factor 0.001 is exact by international definition, not an approximation. Any imprecision comes only from the original measurement, not the conversion.

Looking for the reverse? Convert Millisecond to Microsecond

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Conversion factors verified against NIST, BIPM, ISO 8601 Second defined by Cs-133 transition (SI, BIPM). Last reviewed: March 2026
Adilson Fernandes By Adilson Fernandes
Tiago Fernandes Reviewed by Tiago Fernandes

All unit conversions on CoolConversion use conversion factors defined or documented by internationally recognised standards bodies (such as ISO and NIST), including both SI and non-SI units.