Convert years to milliseconds
Converting years to milliseconds is a common time task, whether you are checking a recipe, a spec sheet, a travel distance or a homework problem. Since 1 yr equals 31,557,000,000 ms, the math is a single multiplication — and this page does it for you instantly, with the formula, a table of common values and answers to the questions people ask most.
Exact factor
How to convert years to milliseconds
To convert years to milliseconds, multiply the number of years by 31,557,000,000. For example, 10 yr × 31,557,000,000 = 315,570,000,000 ms.
ms = yr × 31,557,000,000
- Write down the value in years you want to convert.
- Multiply it by 31,557,000,000 (the exact yr→ms factor).
- The result is your value in milliseconds. Check it below with the converter or the table.
Conversion table
Common values of years and their equivalents in milliseconds:
| yr | ms |
|---|---|
| 1 | 31,557,000,000 |
| 2 | 63,113,900,000 |
| 3 | 94,670,900,000 |
| 4 | 126,228,000,000 |
| 5 | 157,785,000,000 |
| 10 | 315,570,000,000 |
| 20 | 631,139,000,000 |
| 25 | 788,924,000,000 |
| 50 | 1,577,850,000,000 |
| 100 | 3,155,700,000,000 |
| 250 | 7,889,240,000,000 |
| 500 | 15,778,500,000,000 |
About these units
Year (yr). A year is the period of Earth's orbit around the Sun. This tool uses the Gregorian average of 365.2425 days, which matches the calendar over the 400-year leap cycle.
Millisecond (ms). A millisecond is one thousandth of a second, the typical scale of computer response times and camera flashes. Network latency and frame durations are measured in milliseconds.
Frequently asked questions
How do I convert years to milliseconds?
To convert years to milliseconds, multiply the number of years by 31,557,000,000. For example, 10 yr × 31,557,000,000 = 315,570,000,000 ms. Or skip the math: type the value into the converter at the top of this page and the result updates instantly.
How many milliseconds are in 1 year?
1 yr = 31,557,000,000 ms. That is the fixed relationship used by this converter and by international standards.
How many years are in 1 millisecond?
1 ms = 3.1689e-11 yr. If you are converting in the opposite direction, use our Millisecond to Year converter for the dedicated table and FAQ.
Is the years to milliseconds conversion exact?
Yes. Both units are defined by international agreement, so the factor of 31,557,000,000 is exact. Displayed results are rounded to 6 significant digits only for readability.
What is year used for?
A year is the period of Earth's orbit around the Sun. This tool uses the Gregorian average of 365.2425 days, which matches the calendar over the 400-year leap cycle.