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Time
Years to Seconds
Convert years (yr) to seconds (s). Type a value below to see the result update instantly. Reference table and formula included.
Calculator
1 yr = 3.1558e+7 s
Years to Seconds Conversion Table
Common values, ready to copy:
| years | seconds |
|---|---|
| 1 yr | 3.1558e+7 s |
| 2 yr | 6.3115e+7 s |
| 5 yr | 1.5779e+8 s |
| 10 yr | 3.1558e+8 s |
| 25 yr | 7.8894e+8 s |
| 50 yr | 1.5779e+9 s |
| 100 yr | 3.1558e+9 s |
| 1,000 yr | 3.1558e+10 s |
Formula
seconds = years × 31557600
Time uses fixed SI seconds. A day is exactly 86,400 seconds; a year (Julian) is 365.25 days = 31,557,600 seconds.
About Years and Seconds
Years (yr): 365.25 days in the Julian convention (used here); 365.2425 days in the Gregorian calendar; or 365.24219 days in the actual tropical year (the time between vernal equinoxes). Common uses: Birthdays, contract lengths, project lifecycles, financial planning, and any time period longer than a few months.
Seconds (s): The SI base unit of time, defined since 1967 by 9,192,631,770 oscillations of cesium-133 (atomic clock precision is the most accurate unit definition in metrology). Common uses: Athletics timing, scientific measurement, computer benchmarking, music (BPM), and every other use of precise time.
How the conversion works
Time uses fixed SI seconds. A day is exactly 86,400 seconds; a year (Julian) is 365.25 days = 31,557,600 seconds.
The exact relationship is seconds = years × 31557600, which the calculator at the top of this page applies in both directions. Type into either field and the other updates immediately.
When this conversion matters
Converting between years and seconds comes up wherever time measurements move between systems — from one country's conventions to another's, from a scientific reference to a practical specification, or from one industry's working unit to another's. The calculator and reference table above cover the everyday range; for unusual values you can type any number into either field.