What this calculator does
How many milliseconds in a second is a fixed relationship: exactly 1,000. Milliseconds show up wherever timing needs to be finer than a whole second, in video frame timestamps, network latency figures, stopwatch splits, or a script that logs elapsed time in milliseconds instead of seconds.
This calculator converts milliseconds to seconds or seconds to milliseconds, both directions, and shows the equivalent in minutes as well, useful when a millisecond figure turns out to represent a much longer stretch of time than it first appears.
The formula
A millisecond is defined as exactly one thousandth of a second, so converting milliseconds to seconds means dividing by 1,000, and converting seconds to milliseconds means multiplying by 1,000. The factor is exact, with no rounding built into the conversion itself.
| Term | Meaning |
|---|---|
| Millisecond | One thousandth of a second, abbreviated ms. |
| Second | The base SI unit of time; 1,000 milliseconds make one second. |
| 1,000 | The exact, fixed number of milliseconds in a second, used in both directions of this conversion. |
The inputs explained
| Field | What to enter |
|---|---|
| Value | The value to convert, either a number of milliseconds or a number of seconds, depending on the direction chosen below. |
| Convert | Choose whether to convert milliseconds to seconds, or seconds to milliseconds. |
When to use it
Reading a timestamp logged in milliseconds
Many programming languages and APIs report elapsed time or timestamps in milliseconds; converting to seconds gives a figure that is easier to read and compare.
Setting a delay or timeout in milliseconds
A delay quoted in seconds, such as "wait 3 seconds", converts to milliseconds when a function or setting expects the value in that unit.
Comparing durations quoted inconsistently
One duration given in milliseconds and another in seconds convert to the same unit for a direct, apples-to-apples comparison.
Worked examples
Every figure in the tables below is produced by this page’s own calculator at build time, so the numbers and the tool always agree. Select any row to load that scenario.
Milliseconds to seconds, for common values
A range of millisecond values, each converted to seconds and minutes.
| Milliseconds | Seconds | In minutes |
|---|---|---|
| 500 | 0.500 s | 0.0083 min |
| 1000 | 1.000 s | 0.0167 min |
| 2500 | 2.500 s | 0.0417 min |
| 5000 | 5.000 s | 0.0833 min |
| 10000 | 10.000 s | 0.1667 min |
| 60000 | 60.000 s | 1.000 min |
Seconds to milliseconds, for common values
A range of second values, each converted to milliseconds.
| Seconds | Milliseconds | In minutes |
|---|---|---|
| 0.5 | 500 ms | 0.0083 min |
| 1 | 1,000 ms | 0.0167 min |
| 2.5 | 2,500 ms | 0.0417 min |
| 5 | 5,000 ms | 0.0833 min |
| 10 | 10,000 ms | 0.1667 min |
| 30 | 30,000 ms | 0.5000 min |
Questions
How many milliseconds in a second?
Exactly 1,000. A millisecond is defined as one thousandth of a second.
How many seconds is 2,500 milliseconds?
Exactly 2.5 seconds, from 2,500 divided by 1,000.
How do I convert seconds to milliseconds?
Multiply the number of seconds by 1,000. For example, 5 seconds x 1,000 = 5,000 milliseconds.
Is the conversion between milliseconds and seconds ever approximate?
No. A millisecond is exactly one thousandth of a second, so converting in either direction is exact, with no rounding required in the underlying factor.
For durations that need converting to minutes instead, see the minutes to seconds converter. For a broader ladder covering everything from milliseconds to decades in one place, see the time unit converter.