How to Convert Microseconds to Milliseconds (µs to ms)
Time conversions help with project planning, payroll hours and working out how long a loan or COE period really is. This guide shows how to convert microseconds into milliseconds by hand, with examples and a quick-reference table.
The conversion
To convert microseconds to milliseconds, multiply the value by 0.001. To go the other way, divide by the same number (or multiply by 1,000). For a quick estimate, multiply by about 0.001.
Milliseconds = microseconds × 0.001
Worked examples
- 3 µs = 0.003 ms
- 12.5 µs = 0.0125 ms
- 75 µs = 0.075 ms
Microseconds to Milliseconds table
| Microseconds | Milliseconds |
|---|---|
| 1 µs | 0.001 ms |
| 2 µs | 0.002 ms |
| 5 µs | 0.005 ms |
| 10 µs | 0.01 ms |
| 20 µs | 0.02 ms |
| 25 µs | 0.025 ms |
| 50 µs | 0.05 ms |
| 100 µs | 0.1 ms |
| 250 µs | 0.25 ms |
| 500 µs | 0.5 ms |
| 1,000 µs | 1 ms |
Common questions
Is µs to ms exact?
The factors used here are the internationally defined values where they exist; results are rounded for display only.
How do I convert back?
Use the Milliseconds to Microseconds converter.
Mistakes to avoid
Rounding the factor too early
Using 3 instead of 3.28 for feet per metre introduces an error of almost 9% before you have started.
Mixing similar-sounding units
US and imperial gallons, pints and tons are different sizes, and decimal kilobytes differ from binary kibibytes.
Dropping the units
A bare number without a unit is easy to misread later. Always write the unit with the result.
Background
Unit conversion is simply multiplication by a fixed ratio. The ratio between two units of the same quantity never changes, so once you know it you can convert any value in either direction.
Many conversion factors are exact by definition. The inch has been defined as exactly 2.54 centimetres since 1959, and the pound as exactly 0.45359237 kilograms, so conversions involving them can be as precise as you need.
Singapore adopted the metric system in the 1970s, replacing imperial units and traditional Chinese measures in most official uses. Metric units are now standard in schools, trade and government, but older units survive in property, markets and imported goods.
For any value, use the Microseconds to Milliseconds Converter or browse all time converters.
Run your own numbers: Microseconds to Milliseconds Converter