1ms to seconds

How it works

The prefix “milli” represents one thousandth of the base unit. A millisecond is therefore one thousandth of a second. Written as a decimal, 1 ms is 0.001 s. For any conversion from milliseconds to seconds, move the decimal point three places to the left or divide by 1,000. To convert seconds back to milliseconds, multiply by 1,000.

1 ms = 0.001 s 10 ms = 0.01 s 100 ms = 0.1 s 1,000 ms = 1 s Milliseconds are tiny, but software can fit an impressive amount of waiting into them.

Writing time values clearly

Use “ms” for milliseconds and “s” for seconds. Keep the unit beside the value, especially in technical notes, configuration files, test results, and performance reports. A bare value such as “1” does not reveal whether the writer intended seconds, milliseconds, or another unit.

Decimal notation is often the clearest format for seconds. Thus one millisecond becomes 0.001 seconds. Scientific notation can also express the same quantity as 1 × 10 to the power of −3 seconds, but ordinary decimal notation is usually easier for a general audience.

Identify the original unit as milliseconds. Divide the value by 1,000. Write the result with the seconds unit. Preserve enough decimal places to retain the intended precision.

Formats and common mistakes

Do not confuse milliseconds with microseconds. Their abbreviations and scale are different. Also avoid interpreting “1ms” as one minute and one second; in standard time-unit notation, it means one millisecond.

Software interfaces may expect a duration in a particular unit even when the field name is unclear. Check the relevant documentation before entering a value. Supplying 1 where a program expects milliseconds is very different from supplying 1 where it expects seconds.

Rounding can erase a small duration. If a display shows only two decimal places in seconds, 0.001 seconds may appear as 0.00 seconds even though the underlying value is not zero. Retain additional decimal places when the millisecond matters.