Convert seconds to years
Converting seconds to years is a common time task, whether you are checking a recipe, a spec sheet, a travel distance or a homework problem. Since 1 s equals 0.0000000316887 yr, 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 seconds to years
To convert seconds to years, multiply the number of seconds by 0.0000000316887. For example, 10 s × 0.0000000316887 = 0.000000316887 yr.
yr = s × 0.0000000316887
- Write down the value in seconds you want to convert.
- Multiply it by 0.0000000316887 (the exact s→yr factor).
- The result is your value in years. Check it below with the converter or the table.
Conversion table
Common values of seconds and their equivalents in years:
| s | yr |
|---|---|
| 1 | 0.0000000316887 |
| 2 | 0.0000000633775 |
| 3 | 0.0000000950662 |
| 4 | 0.000000126755 |
| 5 | 0.000000158444 |
| 10 | 0.000000316887 |
| 20 | 0.000000633775 |
| 25 | 0.000000792218 |
| 50 | 0.00000158444 |
| 100 | 0.00000316887 |
| 250 | 0.00000792218 |
| 500 | 0.0000158444 |
About these units
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.
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.
Frequently asked questions
How do I convert seconds to years?
To convert seconds to years, multiply the number of seconds by 0.0000000316887. For example, 10 s × 0.0000000316887 = 0.000000316887 yr. Or skip the math: type the value into the converter at the top of this page and the result updates instantly.
How many years are in 1 second?
1 s = 0.0000000316887 yr. That is the fixed relationship used by this converter and by international standards.
How many seconds are in 1 year?
1 yr = 31,557,000 s. If you are converting in the opposite direction, use our Year to Second converter for the dedicated table and FAQ.
Is the seconds to years conversion exact?
Yes. Both units are defined by international agreement, so the factor of 0.0000000316887 is exact. Displayed results are rounded to 6 significant digits only for readability.
What is second used for?
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.