How to convert seconds to years
To convert seconds to years, multiply the value by the conversion factor 3.1689e-8. To go the other way, multiply by 31,556,952 (or divide by 3.1689e-8).
Worked example: 90 s to yr
- Write the value: 90 s
- Multiply by 3.1689e-8: 90 × 3.1689e-8
- Result: 0.000002852 yr
Second to Year conversion table
Quick reference values, rounded to 6 significant digits.
| Second (s) | Year (yr) |
|---|---|
| 0.1 s | 3.1689e-9 yr |
| 0.25 s | 7.9222e-9 yr |
| 0.5 s | 1.5844e-8 yr |
| 1 s | 3.1689e-8 yr |
| 2 s | 6.3377e-8 yr |
| 3 s | 9.5066e-8 yr |
| 4 s | 1.2675e-7 yr |
| 5 s | 1.5844e-7 yr |
| 6 s | 1.9013e-7 yr |
| 7 s | 2.2182e-7 yr |
| 8 s | 2.5351e-7 yr |
| 9 s | 2.852e-7 yr |
| 10 s | 3.1689e-7 yr |
| 12 s | 3.8026e-7 yr |
| 15 s | 4.7533e-7 yr |
| 20 s | 6.3377e-7 yr |
| 25 s | 7.9222e-7 yr |
| 30 s | 9.5066e-7 yr |
| 40 s | 0.0000012675 yr |
| 50 s | 0.0000015844 yr |
| 75 s | 0.0000023767 yr |
| 100 s | 0.0000031689 yr |
| 250 s | 0.0000079222 yr |
| 500 s | 0.0000158444 yr |
| 1,000 s | 0.0000316887 yr |
Year to Second
| yr | s |
|---|---|
| 1 yr | 31,556,952 s |
| 5 yr | 157,784,760 s |
| 10 yr | 315,569,520 s |
| 50 yr | 1,577,847,600 s |
| 100 yr | 3,155,695,200 s |
1 Second in other time units
About Second and Year
What is a second (s)?
The second is the SI base unit of time, defined by the vibrations of the caesium-133 atom.
What is a year (yr)?
An average Gregorian year is 365.2425 days.
Where second to year conversion is used
Time conversions are needed for project planning, salary and work-hour calculations, cooking timers and scientific data. Converting between seconds and years is especially common when you compare products, read foreign specifications, or fill in forms that expect a specific unit.
Need every unit at once? Use the full Time Converter.
Frequently asked questions
How many years are in 1 second?
1 Second equals 3.1689e-8 yr.
How do I convert seconds to years?
Multiply the number of seconds by 3.1689e-8. For example, 90 s × 3.1689e-8 = 0.000002852 yr.
What is 90 s in yr?
90 s = 0.000002852 yr.
How many seconds are in 1 year?
1 Year equals 31,556,952 s. Use the Years to Seconds converter for the reverse direction.
Is this Second to Year converter accurate?
Yes. It uses exact internationally defined conversion factors, calculated with full floating-point precision. Results are displayed rounded for readability.