A year uses the average Gregorian year of 365.2425 days.
Years to Seconds Converter — yr to s
Convert Years (yr) to Seconds (s) using the exact conversion factor (1 years = 31,556,952 seconds). See the formula, worked examples, conversion table, unit comparison, history, and common uses.
Years to Seconds converter
Converter
Astronomy Converter
Convert astronomical length, mass, time, and distance units by compatible family.
Context values
Some unit families need one extra value for a physically accurate result.
The second is the SI base unit of time.
Result = input x 3.1556952e+7 / 1.
Time units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Years to Seconds
Years and Seconds both describe astronomical distances at very different scales — one for measuring within our solar system, the other for the distances between stars — and converting between them helps put the scale of space into perspective. Years is typically associated with universal (Gregorian calendar), while Seconds is typically associated with universal.
Formula
seconds = years × 31556952
This factor comes from each unit's defined relationship to the category's base unit: 1 years equals 31556952 base units, and 1 seconds equals 1 base unit, so dividing one by the other gives the direct years-to-seconds factor of 31556952.
Simple example
1 yr × 31556952 = 31,556,952 s
1 years = 31,556,952 seconds.
Real-world example
4.24 yr × 31556952 = 133,801,476.5 s
4.24 years = 133,801,476.5 seconds.
Conversion table
| Years (yr) | Seconds (s) |
|---|---|
| 1 yr | 31,556,952 s |
| 4.24 yr | 133,801,476.5 s |
| 10 yr | 315,569,520 s |
| 100 yr | 3,155,695,200 s |
| 1,000 yr | 31,556,952,000 s |
| 1,000,000 yr | 3.155695e+13 s |
Reverse conversion: Seconds to Years
1 s × 3.168874e-8 = 3.168874e-8 yr
1 seconds = 3.168874e-8 years.
years = seconds × 3.168874e-8
For a page dedicated to this direction, see Seconds to Years.
Years vs. Seconds
| Aspect | Years | Seconds |
|---|---|---|
| Family | Conventional (calendar) time unit, non-SI accepted for use with SI | SI base unit |
| Typical use | Age, tenure, and long-duration calculations worldwide | Fundamental unit for all timekeeping and scientific measurement |
| Where it's used | Universal (Gregorian calendar) | Universal |
Understanding the Years
Years (yr) measures time. A year is approximately 365.25 days, the time for Earth to orbit the Sun once; the Gregorian calendar year averages 365.2425 days. It is classified as a Conventional (calendar) time unit, non-SI accepted for use with SI.
Where it's used: Universal (Gregorian calendar)
Uses of the Years today
- Age, tenure, and long-duration calculations worldwide
- Financial and legal timeframes (interest rates, contracts)
- Scientific and historical dating
History of the Years
The year as Earth's orbital period is prehistoric in origin, refined through the Julian calendar (46 BCE) and later the Gregorian calendar (1582), which corrected a small drift in the Julian year by adjusting the leap-year rule, bringing the calendar year very close to the true astronomical year.
Historical origin. Years was not the invention of a single named person; it developed through the process described above.
Understanding the Seconds
Seconds (s) measures time. The second is the SI base unit of time, currently defined via a fixed number of cesium atomic transitions. It is classified as a SI base unit.
Where it's used: Universal
Uses of the Seconds today
- Fundamental unit for all timekeeping and scientific measurement
- Basis for derived units like speed (m/s) and frequency (Hz)
History of the Seconds
The second originated from dividing the day into 24 hours, each into 60 minutes, each into 60 seconds — a sexagesimal (base-60) system inherited from Babylonian astronomy. Since 1967, the second has been defined atomically, as exactly 9,192,631,770 periods of radiation from a cesium-133 transition, decoupling timekeeping from the Earth's slightly irregular rotation.
Historical origin. Seconds was not the invention of a single named person; it developed through the process described above.
Years — sources
- BIPM SI Brochure — Non-SI units accepted for use with SI — Lists the year among accepted non-SI time units.
Seconds — sources
- BIPM — The second (SI base unit) — Current atomic definition and history of the second.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many seconds are in 1 years?
1 years equals 31,556,952 seconds, using the exact defined conversion factor rather than an estimate.
How do I convert years to seconds?
Multiply the years value by 31556952. The converter above does this instantly to whatever precision you set.
How do I convert seconds back to years?
Use the reverse factor: 1 seconds equals 3.168874e-8 years. You can also use the swap control in the converter above to flip the direction instantly.
What is a years?
Years (yr) measures time. A year is approximately 365.25 days, the time for Earth to orbit the Sun once; the Gregorian calendar year averages 365.2425 days. It is classified as a Conventional (calendar) time unit, non-SI accepted for use with SI.
What is a seconds?
Seconds (s) measures time. The second is the SI base unit of time, currently defined via a fixed number of cesium atomic transitions. It is classified as a SI base unit.
Is the years to seconds conversion exact?
Yes. Both years and seconds are defined by fixed standards rather than physical artifacts, so the factor of 31556952 used above is exact to as many digits as you choose to display.
Where is the years still used today?
Universal (Gregorian calendar)