Milliseconds to Seconds Converter
Enter the time in milliseconds below to convert it to seconds.
Convert Milliseconds to Seconds
Enter a value in milliseconds (ms) to convert to seconds (s).
Millisecond to Second Conversion Table
Table showing various millisecond measurements converted to seconds. Click any preset value or arrow to load it into the converter.
How to Convert Milliseconds to Seconds
To convert milliseconds to seconds, multiply the time by the following conversion ratio: 0.001 seconds/millisecond.
Since one millisecond is equal to 0.001 seconds, you can use this simple formula to convert:
The time in seconds is equal to the time in milliseconds multiplied by 0.001.
For example, here's how to convert 1500 milliseconds to seconds using the formula above.
How Many Seconds Are in a Millisecond?
There are 0.001 seconds in a millisecond, which is why we use this value in the formula above.
Our millisecond to second calculator automatically converts your time measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Milliseconds and seconds are both units used to measure time. Keep reading to learn more about each unit.
What Is a Millisecond?
A millisecond is a unit of time equal to 1/1,000 of a second (0.001 s). One-thousandth of a second (10⁻³ s). [1]
The millisecond is classified as a metric and SI-compatible unit of time. Milliseconds can be abbreviated as ms; for example, 1 millisecond can be written as 1 ms.
In the metric system, "milli" is the standard SI prefix for thousandths, or 10⁻³. This makes the millisecond (ms) a convenient decimal multiple of the second (s).
In practice, milliseconds (ms) are widely used across fine-tolerance laboratory, analytical, and micro-scale time measurements within SI metric workflows, engineering documentation, and technical data sheets.
What Is a Second?
Base SI unit of time. It serves as a primary reference unit for measuring time across scientific and practical applications. [2]
The second is classified as an International System of Units (SI) unit of time. Seconds can be abbreviated as s; for example, 1 second can be written as 1 s.
As the primary coherent reference unit for time in this category, all other time units are mathematically anchored to the second (s).
In practice, seconds (s) are widely used across standard time applications within International System of Units (SI) workflows, engineering documentation, and technical data sheets.
When converting time between milliseconds (ms) and seconds (s), keep full floating-point precision (1 ms = 0.001 s; 1 s = 1,000 ms) during intermediate calculations and round only the final second figure to match your instrument tolerance.
More Millisecond & Second Conversions
Need to calculate in the opposite direction? Use our seconds to milliseconds converter (s to ms) to switch your starting unit immediately. You can also explore related tools such as converting days to seconds, converting minutes to seconds, or converting seconds to minutes.
Convert from Milliseconds
Frequently Asked Questions
References
- [1]NIST OWM StandardNIST OWM (SI Units — Time)·Time Metrology Standard — Milliseconds (ms) to Seconds (s)
- [2]BIPM SpecificationBIPM (SI Base Unit: Second (s))·Unit Specifications: Millisecond (ms) & Second (s)
- [3]NIST CUU ReferenceNIST CUU (Non-SI Units Accepted for Use (min, h, d))·Conversion Factors & Mathematical Basis (ms to s)