# How many milliseconds are in a year?

• A millisecond is 1/1000 of a second. So, there are 1000 milliseconds in a second.

Now… there are 60 seconds in a minute, 60 minutes in an hour, 24 hours in a day, and 365.25 days in a year – so:

60 X 60 X 24 X 365.25 is the number of seconds, and then multiply this by 1000: 31,557,600 X 1000 = 31,557,600,000 milliseconds

• Technically all of the above answers are wrong. The mean solar day is 24 hours and 2 milliseconds long (the Earth’s rotation has slowed a bit since we defined the length of a second and day).

So, there are 86400002 milliseconds in a day, giving us 31536000730 milliseconds in a year.

• 31536000000 Milliseconds

• Actually you guys are all wrong. There are actually 100 milliseconds in a second .So….. There are 3,155,760,000. Sorry for not writing down the formula like that guy which explain everything .But my answer is a true fact.I hope I got picked as best answer. 🙂

• There are about 31556926 (thirty-one and a half million) seconds in a year, which translates to about 31556926000 (thirty-one and a half billion) milliseconds.

• Get the number of seconds in one sidereal year which is 31,556,926.2797 seconds and multiply it by 1000 and you get 31,556,926,279.7 milliseconds accurate to one decimal..

• There are 31,556,926,000 milliseconds in one tropical year (from one vernal equinox to the next one).