Milliseconds to Seconds
An instant milliseconds-to-seconds converter, with the formula and a reference table below.
| Milliseconds | Seconds |
|---|---|
| 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 |
| 25 ms | 0.025 s |
| 50 ms | 0.05 s |
| 100 ms | 0.1 s |
How to use
- Enter a value in the Milliseconds field.
- The Seconds figure appears immediately — no button to press.
- Typing in the Seconds field converts back to Milliseconds the same way.
- Use the reference table for the values that come up most often.
Milliseconds to Seconds formula
The factor from milliseconds to seconds is 0.001.
s = ms × 0.001
Put another way, one millisecond is exactly 1/1,000 of a second.
Why this factor: the millisecond and the second are both defined against the second, so dividing one definition by the other gives 0.001 directly. Both definitions are set out in full below.
To go the other way, divide by 0.001 — or use the Seconds to Milliseconds converter, which is the same calculation reversed.
Worked example
Take 90 ms and multiply by the factor 0.001: the result is 0.09 s.
90 ms × 0.001 = 0.09 s
The converter above does this for any value you type, in either direction.
What is a millisecond?
A millisecond is one thousandth of a second, the unit of perceptible computing delay.
Definition: Exactly 0.001 second by SI prefix definition.
Where it is used: Network latency and ping times, audio buffer sizes, and animation and reaction timings.
What is a second?
The second is the SI base unit of time and the most precisely realized unit in all of measurement.
Definition: Defined by fixing the caesium-133 hyperfine transition frequency at exactly 9,192,631,770 hertz — the basis of every atomic clock.
Where it is used: Universal, and the reference for all other time units.
Milliseconds vs Seconds
The millisecond is a metric unit while the second is an SI unit. That is why the factor between them is not a round number: the two systems were defined independently and only later tied together by exact agreement.
Frequently asked questions
How many seconds are in a millisecond?
One millisecond equals 0.001 seconds.
What is the formula to convert milliseconds to seconds?
Multiply the number of milliseconds by 0.001. To reverse it, divide by 0.001 instead.
How do I convert seconds back to milliseconds?
Divide by 0.001, which is the same as multiplying by 1000.
How many seconds are in 10 milliseconds?
10 ms works out to 0.01 s.
How is the millisecond defined?
Exactly 0.001 second by SI prefix definition.