Convert years to seconds
Converting years to seconds 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 s, 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 seconds
To convert years to seconds, multiply the number of years by 31,557,000. For example, 10 yr × 31,557,000 = 315,570,000 s.
s = yr × 31,557,000
- Write down the value in years you want to convert.
- Multiply it by 31,557,000 (the exact yr→s factor).
- The result is your value in seconds. Check it below with the converter or the table.
Conversion table
Common values of years and their equivalents in seconds:
| yr | s |
|---|---|
| 1 | 31,557,000 |
| 2 | 63,113,900 |
| 3 | 94,670,900 |
| 4 | 126,228,000 |
| 5 | 157,785,000 |
| 10 | 315,570,000 |
| 20 | 631,139,000 |
| 25 | 788,924,000 |
| 50 | 1,577,850,000 |
| 100 | 3,155,700,000 |
| 250 | 7,889,240,000 |
| 500 | 15,778,500,000 |
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.
Second (s). The second is the SI base unit of time, defined by the cesium-133 atomic transition frequency of 9,192,631,770 hertz. It is the foundation of all time measurement.
Frequently asked questions
How do I convert years to seconds?
To convert years to seconds, multiply the number of years by 31,557,000. For example, 10 yr × 31,557,000 = 315,570,000 s. Or skip the math: type the value into the converter at the top of this page and the result updates instantly.
How many seconds are in 1 year?
1 yr = 31,557,000 s. That is the fixed relationship used by this converter and by international standards.
How many years are in 1 second?
1 s = 0.0000000316887 yr. If you are converting in the opposite direction, use our Second to Year converter for the dedicated table and FAQ.
Is the years to seconds conversion exact?
Yes. Both units are defined by international agreement, so the factor of 31,557,000 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.