How to convert years to seconds
s = yr × 31,556,952Multiply the value in years by 31,556,952. To go the other way, multiply by 3.168873851×10⁻⁸ (or divide by 31,556,952).
A year is larger than a second: one year contains 31,556,952 seconds.
Worked examples
- 1 year (Gregorian)1 yr × 31,556,952 = 31,556,952 s
- 5 years5 yr × 31,556,952 = 157,784,760 s
- 10 years10 yr × 31,556,952 = 315,569,520 s
- 20 years20 yr × 31,556,952 = 631,139,040 s
- 100 years100 yr × 31,556,952 = 3,155,695,200 s
Years to seconds conversion table
Values are calculated by the conversion engine and rounded to 8 significant figures.
| Years (yr) | Seconds (s) |
|---|---|
| 0.1 yr | 3,155,695.2 s |
| 0.25 yr | 7,889,238 s |
| 0.5 yr | 15,778,476 s |
| 1 yr | 31,556,952 s |
| 2 yr | 63,113,904 s |
| 3 yr | 94,670,856 s |
| 4 yr | 126,227,810 s |
| 5 yr | 157,784,760 s |
| 6 yr | 189,341,710 s |
| 7 yr | 220,898,660 s |
| 8 yr | 252,455,620 s |
| 9 yr | 284,012,570 s |
| 10 yr | 315,569,520 s |
| Years (yr) | Seconds (s) |
|---|---|
| 12 yr | 378,683,420 s |
| 15 yr | 473,354,280 s |
| 20 yr | 631,139,040 s |
| 25 yr | 788,923,800 s |
| 30 yr | 946,708,560 s |
| 40 yr | 1,262,278,100 s |
| 50 yr | 1,577,847,600 s |
| 75 yr | 2,366,771,400 s |
| 100 yr | 3,155,695,200 s |
| 250 yr | 7,889,238,000 s |
| 500 yr | 15,778,476,000 s |
| 1,000 yr | 31,556,952,000 s |
About the units
Year (yr)
The mean Gregorian calendar year of 365.2425 days, which accounts for leap years. One year equals 31,556,952 seconds (s).
Second (s)
The SI base unit of time, defined by 9,192,631,770 periods of caesium-133 radiation.
Frequently asked questions
How many seconds are in one year?
There are 31,556,952 seconds in one year, and this value is exact by definition.
How do I convert years to seconds?
Multiply the number of years by 31,556,952. For example, 10 yr × 31,556,952 = 315,569,520 s.
How many years are in one second?
One second equals 3.168873851×10⁻⁸ years. That is the reverse factor, 1 ÷ 31,556,952.
What is 10 years in seconds?
10 yr = 315,569,520 s.
Is this yr to s converter accurate?
Yes. Both units are defined exactly in terms of SI units, so the conversion factor is exact; results are shown to 12 significant figures by default and you can change precision in the converter. Calculations run in your browser using the same tested engine that generated this page.