Microseconds to Milliseconds Converter
Enter the time in microseconds below to convert it to milliseconds.
Convert Microseconds to Milliseconds
Enter a value in microseconds (µs) to convert to milliseconds (ms).
Microsecond to Millisecond Conversion Table
Table showing various microsecond measurements converted to milliseconds. Click any preset value or arrow to load it into the converter.
How to Convert Microseconds to Milliseconds
To convert microseconds to milliseconds, multiply the time by the following conversion ratio: 0.001 milliseconds/microsecond.
Since one microsecond is equal to 0.001 milliseconds, you can use this simple formula to convert:
The time in milliseconds is equal to the time in microseconds multiplied by 0.001.
For example, here's how to convert 5 microseconds to milliseconds using the formula above.
How Many Milliseconds Are in a Microsecond?
There are 0.001 milliseconds in a microsecond, which is why we use this value in the formula above.
Our microsecond to millisecond calculator automatically converts your time measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Microseconds and milliseconds are both units used to measure time. Keep reading to learn more about each unit.
What Is a Microsecond?
A microsecond is a unit of time equal to 1/1,000,000 of a second (0.000001 s). One-millionth of a second (10⁻⁶ s). [1]
The microsecond is classified as a metric and SI-compatible unit of time. Microseconds can be abbreviated as µs; for example, 1 microsecond can be written as 1 µs.
In the metric system, "micro" is the standard SI prefix for millionths, or 10⁻⁶. This makes the microsecond (µs) a convenient decimal multiple of the second (s).
In practice, microseconds (µs) are widely used across fine-tolerance laboratory, analytical, and micro-scale time measurements within SI metric workflows, engineering documentation, and technical data sheets.
What Is a Millisecond?
A millisecond is a unit of time equal to 1/1,000 of a second (0.001 s). One-thousandth of a second (10⁻³ s). [2]
The millisecond is classified as a metric and SI-compatible unit of time. Milliseconds can be abbreviated as ms; for example, 1 millisecond can be written as 1 ms.
In the metric system, "milli" is the standard SI prefix for thousandths, or 10⁻³. This makes the millisecond (ms) a convenient decimal multiple of the second (s).
In practice, milliseconds (ms) are widely used across fine-tolerance laboratory, analytical, and micro-scale time measurements within SI metric workflows, engineering documentation, and technical data sheets.
When converting time between microseconds (µs) and milliseconds (ms), keep full floating-point precision (1 µs = 0.001 ms; 1 ms = 1,000 µs) during intermediate calculations and round only the final millisecond figure to match your instrument tolerance.
More Microsecond & Millisecond Conversions
Need to calculate in the opposite direction? Use our milliseconds to microseconds calculator to switch your starting unit immediately. You can also explore related tools such as converting milliseconds to microseconds, converting seconds to milliseconds, or converting seconds to minutes.
Convert from Microseconds
Frequently Asked Questions
References
- [1]NIST OWM StandardNIST OWM (SI Units — Time)·Time Metrology Standard — Microseconds (µs) to Milliseconds (ms)
- [2]BIPM SpecificationBIPM (SI Base Unit: Second (s))·Unit Specifications: Microsecond (µs) & Millisecond (ms)
- [3]NIST CUU ReferenceNIST CUU (Non-SI Units Accepted for Use (min, h, d))·Conversion Factors & Mathematical Basis (µs to ms)