Milliseconds to Nanoseconds Converter

What this converter does

This converts milliseconds into nanoseconds, a jump across two of the small time units in one go. A nanoseconds is tiny, a billionth of a second, so even a modest number of milliseconds turns into a very large nanosecond figure. Type in the milliseconds and the nanoseconds come straight back.

How to use it

1. Enter Milliseconds. Type the number of milliseconds.

Press Calculate and the equivalent in nanoseconds appears.

Two steps down, so a millionfold

On the ladder of small time units, each rung is a thousand times finer than the one above it. Milliseconds sit two rungs above nanoseconds, with microseconds in between. So going from milliseconds straight to nanoseconds is a thousand times a thousand, which is a million. To convert, you multiply by 1,000,000. One millisecond is a million nanoseconds, and the figures climb quickly from there. As with the other steps on this ladder, the relationship is exact.

Where nanoseconds matter

Nanoseconds belong to the world of hardware and the very fastest operations. They are the scale at which processors tick, at which memory is read, and at which individual machine instructions run. When people benchmark code at its lowest level, or reason about how long a single tiny operation takes, nanoseconds are the natural unit, because milliseconds and even microseconds are far too broad to show the difference. Converting a millisecond figure down to nanoseconds puts it on that same fine footing for comparison.

An example

Take 2 milliseconds. Multiply by 1,000,000 and you have 2,000,000 nanoseconds. Even a tenth of a millisecond, 0.1, works out to 100,000 nanoseconds. The huge numbers are a sign of just how much finer a nanosecond is than a millisecond, a million-to-one gap.

Questions people ask

How many nanoseconds are in a millisecond?

1,000,000. A millisecond is a thousand microseconds, and each of those is a thousand nanoseconds, so a thousand times a thousand is a million.

Why are the numbers so large?

Because a nanosecond is a billionth of a second, vastly smaller than a millisecond. It takes a million of them to make one millisecond.

Is it exact?

Yes. These are defined relationships between the units, so the conversion involves no rounding.

How do I reverse it?

Divide the nanoseconds by 1,000,000 to get back to milliseconds.

References

1. BIPM, The International System of Units (SI) Brochure, SI prefixes. https://www.bipm.org/en/publications/si-brochure