Years to Seconds Converter
Enter the time in years below to convert it to seconds.
Convert Years to Seconds
Enter a value in years (yr) to convert to seconds (s).
Year to Second Conversion Table
Table showing various year measurements converted to seconds. Click any preset value or arrow to load it into the converter.
| Years (yr) | Seconds (s) |
|---|---|
| 0.0000001 yr | 3.1556952 s |
| 0.0000002 yr | 6.3113904 s |
| 0.0000003 yr | 9.4670856 s |
| 0.0000004 yr | 12.6227808 s |
| 0.0000005 yr | 15.778476 s |
| 0.0000006 yr | 18.9341712 s |
| 0.0000007 yr | 22.0898664 s |
| 0.0000008 yr | 25.2455616 s |
| 0.0000009 yr | 28.4012568 s |
| 0.00000001 yr | 0.3155695 s |
How to Convert Years to Seconds
To convert years to seconds, multiply the time by the following conversion ratio: 31,556,952 seconds/year.
Since one year is equal to 31,556,952 seconds, you can use this simple formula to convert:
The time in seconds is equal to the time in years multiplied by 31,556,952.
For example, here's how to convert 5 years to seconds using the formula above.
How Many Seconds Are in a Year?
There are 31,556,952 seconds in a year, which is why we use this value in the formula above.
Our year to second calculator automatically converts your time measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Years and seconds are both units used to measure time. Keep reading to learn more about each unit.
What Is a Year?
A year is a unit of time equal to 31,556,952 seconds (s), the base unit for time. Average Gregorian calendar year (31,556,952 seconds). [1]
The year is classified as a standard unit of time. Years can be abbreviated as yr; for example, 1 year can be written as 1 yr.
When working with years (yr) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, years (yr) are widely used across large-scale industrial, bulk, and macro-level time specifications within international standard workflows, engineering documentation, and technical data sheets.
What Is a Second?
Base SI unit of time. It serves as a primary reference unit for measuring time across scientific and practical applications. [2]
The second is classified as an International System of Units (SI) unit of time. Seconds can be abbreviated as s; for example, 1 second can be written as 1 s.
As the primary coherent reference unit for time in this category, all other time units are mathematically anchored to the second (s).
In practice, seconds (s) are widely used across standard time applications within International System of Units (SI) workflows, engineering documentation, and technical data sheets.
When converting time between years (yr) and seconds (s), keep full floating-point precision (1 yr = 31,556,952 s; 1 s = 0.000000032 yr) during intermediate calculations and round only the final second figure to match your instrument tolerance.
More Year & Second Conversions
Need to calculate in the opposite direction? Use our seconds to years calculator to switch your starting unit immediately. You can also explore related tools such as converting seconds to years, converting milliseconds to seconds, or converting days to seconds.
Frequently Asked Questions
References
- [1]NIST OWM StandardNIST OWM (SI Units — Time)·Time Metrology Standard — Years (yr) to Seconds (s)
- [2]BIPM SpecificationBIPM (SI Base Unit: Second (s))·Unit Specifications: Year (Gregorian 365.2425 d) (yr) & Second (s)
- [3]NIST CUU ReferenceNIST CUU (Non-SI Units Accepted for Use (min, h, d))·Conversion Factors & Mathematical Basis (yr to s)