Microsecond to Millisecond Converter
Time · unit-converter
Convert Microsecond to Millisecond with a fixed input and output unit, step-by-step formula line, and reference tables. Year = 365 days and month = 30 days in this tool for consistent factors; calendar months and leap years differ in real life.
Calculator
From: Microsecond (us)
To: Millisecond (ms)
About Microsecond
One microsecond is one millionth of a second. Electronics and high-speed measurements use microseconds.
About Millisecond
One millisecond is one thousandth of a second. Computing, audio, and reaction times use milliseconds.
How to convert microseconds to milliseconds
1 microsecond is equal to 0.001 millisecond:
1 us = (0.000001 s ÷ 0.001 s) ms = 0.001 ms
Each microsecond is defined as 0.000001 s and each millisecond as 0.001 s, so one us equals 0.000001 ÷ 0.001 ms = 0.001 ms.
Let t(us) be the numeric value of the same duration measured in Microsecond (us), and t(ms) the value in Millisecond (ms). Then:
t(ms) = t(us) × (0.000001 / 0.001)
Equivalently, divide by how many us fit into one ms (seconds per ms divided by seconds per us):
t(ms) = t(us) ÷ 1000.00000000000011
Or: millisecond = microsecond ÷ 1000.00000000000011
Examples
Example #1: Convert 20 us to millisecond
20 us = 20 us × (0.000001/0.001) ms = 0.02 ms
20 us = 20 us ÷ 1000.00000000000011 = 0.02 ms
Example #2: Convert 50 us to millisecond
50 us = 50 us × (0.000001/0.001) ms = 0.05 ms
50 us = 50 us ÷ 1000.00000000000011 = 0.05 ms
Summary
To convert Microsecond to Millisecond, multiply the value in us by the ratio of seconds per us divided by seconds per ms. Equivalently: value_ms = value_us × (0.000001 / 0.001). Numerically, 1 us equals 0.001 ms.
Relationship context
Both units fall in subsecond precision (milliseconds and smaller). Conversions use fixed second counts per unit, so factors stay consistent for estimation and UI math. The factor from Microsecond to Millisecond is 1.000000e-3 (1 us = 0.001 ms).
Conversion tables
| Microsecond (us) | Millisecond (ms) |
|---|---|
| 0.1 | 0.0001 |
| 1 | 0.001 |
| 2 | 0.002 |
| 3 | 0.003 |
| 4 | 0.004 |
| 5 | 0.005 |
| 6 | 0.006 |
| 7 | 0.007 |
| 8 | 0.008 |
| 9 | 0.009 |
| Microsecond (us) | Millisecond (ms) |
|---|---|
| 10 | 0.01 |
| 20 | 0.02 |
| 30 | 0.03 |
| 40 | 0.04 |
| 50 | 0.05 |
| 60 | 0.06 |
| 70 | 0.07 |
| 80 | 0.08 |
| 90 | 0.09 |
| 100 | 0.1 |