How to Convert Milliseconds to Microseconds (ms to µs)
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 milliseconds into microseconds by hand, with examples and a quick-reference table.
The conversion
To convert milliseconds to microseconds, multiply the value by 1,000. To go the other way, divide by the same number (or multiply by 0.001). For a quick estimate, multiply by about 1,000.
Microseconds = milliseconds × 1,000
Worked examples
- 3 ms = 3,000 µs
- 12.5 ms = 12,500 µs
- 75 ms = 75,000 µs
Milliseconds to Microseconds table
| Milliseconds | Microseconds |
|---|---|
| 1 ms | 1,000 µs |
| 2 ms | 2,000 µs |
| 5 ms | 5,000 µs |
| 10 ms | 10,000 µs |
| 20 ms | 20,000 µs |
| 25 ms | 25,000 µs |
| 50 ms | 50,000 µs |
| 100 ms | 100,000 µs |
| 250 ms | 250,000 µs |
| 500 ms | 500,000 µs |
| 1,000 ms | 1,000,000 µs |
Common questions
Is ms to µs 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 Microseconds to Milliseconds 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.
Multiplying when you should divide
Converting to a smaller unit gives a bigger number, and converting to a larger unit gives a smaller one. If your answer moves the wrong way, you have inverted the factor.
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.
Writing the units next to every number while you work is the simplest way to avoid mistakes. If the units do not cancel to leave the one you want, the calculation is set up wrongly.
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.
For any value, use the Milliseconds to Microseconds Converter or browse all time converters.
Run your own numbers: Milliseconds to Microseconds Converter