Convert milliseconds to seconds
Convert milliseconds to seconds instantly. 1 ms = 0.001 s. Formula, worked examples and a quick reference table.
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One millisecond equals 0.001 seconds. To convert any number of milliseconds to seconds, multiply by 0.001.
The converter above works in both directions and updates as you type. Below you will find the formula, a worked example and a reference table of common values.
Time conversions are exact down to the day and approximate above it. Seconds, minutes, hours and days have fixed ratios, but a month has no fixed length and a year has two — 365 days in the calendar and 365.25 in the astronomical convention used here. For anything with legal or contractual weight, count the actual calendar dates rather than converting a duration, because the difference accumulates precisely where it is least welcome.
milliseconds to seconds formula
To go the other way, use millisecond = second ÷ 0.001.
About these units
A millisecond is a thousandth of a second. It is the unit of network latency and of video frame timing, where a difference of twenty is visible.
The second is defined by the caesium atom: 9,192,631,770 oscillations of a particular transition. Every other time unit is now derived from it.
Millisecond is also written milliseconds and msec. Second is also written seconds, sec and secs.
Sources
milliseconds to seconds conversion table
| Millisecond | Second |
|---|---|
| 1 ms | 0.001 s |
| 2 ms | 0.002 s |
| 3 ms | 0.003 s |
| 5 ms | 0.005 s |
| 10 ms | 0.01 s |
| 20 ms | 0.02 s |
| 25 ms | 0.025 s |
| 50 ms | 0.05 s |
| 100 ms | 0.1 s |
| 250 ms | 0.25 s |
| 500 ms | 0.5 s |
| 1,000 ms | 1 s |
Frequently asked questions
How many seconds are in a millisecond? +
There are 0.001 seconds in one millisecond.
What is 10 ms in s? +
10 ms equals 0.01 s. Multiply 10 by 0.001.
How do I convert second back to millisecond? +
Use millisecond = second ÷ 0.001. The converter above handles both directions, or see our dedicated seconds to milliseconds page.
How accurate is this millisecond to second conversion? +
The factor used is 0.001, carried at full double precision. Where a unit has an exact legal definition the factor is exact rather than approximate. Rounding is applied only to the displayed result, so the answer is never a calculation done on an already-rounded number.
Is there a quick way to estimate ms to s in my head? +
Divide by 1,000. That matches the true factor of 0.001 exactly, so no adjustment is needed for a mental estimate.