How to convert seconds to years
To convert a measurement in seconds to years, multiply the value by 0.000000031689. The conversion factor comes from the relationship between both units and the second.
For example, to convert 5 s to years: 5 × 0.000000031689 = 0.000000158444 yr.
What is a second?
A second is the SI base unit of time, defined by the radiation period of the caesium-133 atom (9,192,631,770 cycles). Historically defined as 1/86,400 of a mean solar day, the second was redefined in 1967 using atomic clocks, making it one of the most precisely realized units in all of science.
Common uses of seconds include: Scientific timing and physics experiments; Sports timing and lap records; Computing timeouts and latency measurements; Everyday stopwatch and countdown timing.
What is a year?
A year here is the average Gregorian year, equal to 365.2425 days (31,556,952 seconds), the value that keeps the calendar aligned with the seasons. The Gregorian calendar, introduced in 1582, uses an average year of 365.2425 days achieved through its leap-year rules, refining the older Julian year of 365.25 days.
Common uses of years include: Interest and investment calculations; Age and anniversary tracking; Warranty and contract periods; Astronomical and historical timelines.
Seconds to years worked examples
Here are some common values converted:
1 s = 0.000000031689 yr 5 s = 0.000000158444 yr 10 s = 0.000000316887 yr 50 s = 0.000001584437 yr 100 s = 0.000003168874 yr
Frequently asked questions
How many years are in one second?
One second (s) equals 0.000000031689 years (yr). Multiply any value in seconds by 0.000000031689 to convert to years.
How do I convert seconds to years?
Multiply the value in seconds by 0.000000031689. For example, 5 s × 0.000000031689 = 0.000000158444 yr.
How do I convert years to seconds?
Multiply the value in years by 31,556,952, or divide by 0.000000031689. Use the swap button on the converter above to reverse the direction.
Is the second to year conversion exact?
Fixed units (second through week) are exact. Month and year use the average Gregorian calendar length (30.44 and 365.2425 days) since these vary in practice.
What is the formula for seconds to years?
The formula is: yr = s × 0.000000031689. This comes from the definition of both units relative to the second.