1 millisecond =
1,000 microseconds
1 microsecond =
0.001 milliseconds
Handy values
5 ms = 5,000 µs · 10 ms = 10,000 µs · 100 ms = 100,000 µs
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⚡ Milliseconds to Microseconds: the quick answer
1 ms = 1,000 µs
1 millisecond equals 1,000 microseconds
To convert milliseconds to microseconds, multiply the value by 1,000.
To go the other way, multiply microseconds by 0.001 to get milliseconds.
↔ Convert microseconds to milliseconds instead
🧮 Formula
Every unit here is defined by its time in seconds, so the conversion factor is (seconds per millisecond) ÷ (seconds per microsecond).
📊 Milliseconds to Microseconds conversion table
✏️ Worked examples
📘 About these units
Millisecond (ms). A millisecond is one thousandth of a second, used for reaction times and computer timing.
Microsecond (µs). A microsecond is one millionth of a second.
❓ Frequently asked questions
How many microseconds are in one millisecond?
There are 1,000 microseconds in one millisecond.
How do I convert milliseconds to microseconds?
Multiply the number of milliseconds by 1,000. For example, 10 milliseconds equal 10,000 microseconds.
How many milliseconds are in one microsecond?
One microsecond equals 0.001 milliseconds.
How many microseconds is 12 milliseconds?
12,000 microseconds. Other common values: 5 milliseconds = 5,000 microseconds and 100 milliseconds = 100,000 microseconds.
🔗 More time conversions
All time units →
What people are saying
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Anonymous · 22 Oct 2026