Convert Years to Seconds
1 year is 31,556,952 s. One year is exactly 31556952 seconds.
One year is 31556952 seconds. To convert years to seconds, multiply by 31556952; to go the other way, divide by 31556952 or multiply by 3.1689 × 10^-8. This one is an average rather than an exact factor: a calendar year is 365 days or 366, so this figure is an average across the 400-year leap cycle. The definition comes from BIPM SI Brochure. The average Gregorian year, 365.2425 days — the figure the leap-year rule exists to produce.
Factor checked against the defining standard · How we check
- Years × 31556952
value * 3155695231,556,952 s
1 year in every time unit
| Unit | Value | Exact factor |
|---|---|---|
| seconds | 31,556,952 s | × 31,556,952 |
| minutes | 525,949.2 min | × 525,949.2 |
| hours | 8,765.82 h | × 8,765.82 |
| days | 365.2425 d | × 365.2425 |
| weeks | 52.1775 wk | × 52.1775 |
| months | 12 mo | × 12 |
| years (as entered) | 1 yr | — |
Factors are entered by hand from BIPM SI Brochure rather than derived from a units library, so the ones that terminate are exact rather than rounded.
How do you convert years to seconds?
- 1.Take the measurement in years.
- 2.Multiply by 31556952 — that is how many seconds fit in one year.
- 3.To go back the other way, divide by 31556952, or multiply by 3.1689 × 10^-8.
Years to seconds conversion table
| Years | Seconds |
|---|---|
| 1 yr | 31,556,952 s |
| 2 yr | 63,113,904 s |
| 3 yr | 94,670,856 s |
| 4 yr | 126,227,808 s |
| 5 yr | 157,784,760 s |
| 6 yr | 189,341,712 s |
| 7 yr | 220,898,664 s |
| 8 yr | 252,455,616 s |
| 9 yr | 284,012,568 s |
| 10 yr | 315,569,520 s |
| 12 yr | 378,683,424 s |
| 15 yr | 473,354,280 s |
| 20 yr | 631,139,040 s |
| 25 yr | 788,923,800 s |
| 50 yr | 1,577,847,600 s |
| 100 yr | 3,155,695,200 s |
What are years and seconds?
- Year (yr)
- The average Gregorian year, 365.2425 days — the figure the leap-year rule exists to produce.
- Second (s)
- The SI base unit of time, fixed since 1967 by the caesium-133 hyperfine transition frequency of 9,192,631,770 Hz.
Source: BIPM SI Brochure — the second, and units accepted for use with the SI
Questions people actually ask
- How many seconds are in a year?
- 31556952. The SI base unit of time, fixed since 1967 by the caesium-133 hyperfine transition frequency of 9,192,631,770 Hz.
- How do I convert seconds back to years?
- Divide by 31556952, or multiply by 3.1689 × 10^-8 — they are the same operation.
Other time conversions
Seconds to years — the same conversion the other way.