Years to Seconds
Convert years to seconds instantly. 1 yr = 31,556,952 s. Includes the exact factor, a conversion table of common values and the definition of both units.
How to convert years to seconds
To convert years to seconds, multiply by 31,556,952. The relationship is fixed, so the same factor works for any quantity — there is nothing to look up and nothing that changes with temperature, location or context.
s = yr × 31,556,952
Years to Seconds conversion table
The values people look up most often, rounded for reading. Use the calculator above for anything in between.
| Years | Seconds |
|---|---|
| 1 yr | 31,556,952 s |
| 2 yr | 63,113,904 s |
| 3 yr | 94,670,856 s |
| 5 yr | 157,784,760 s |
| 10 yr | 315,569,520 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 |
| 500 yr | 15,778,476,000 s |
| 1,000 yr | 31,556,952,000 s |
What is a year?
The mean Gregorian year of 365.2425 days.
What is a second?
The SI base unit of time, defined by the caesium atom's resonance.
The formula
s = yr × 31,556,952
Every result on this page comes from this formula. Nothing is rounded until the final display, so figures match a spreadsheet to the cent.
How to use the Years to Seconds
- Type the number of years you want to convert.
- Read the result in seconds straight away — there is no button to press.
- Check the table below for the values that come up most often, or reverse the conversion with the linked seconds to years page.
Years to Seconds — frequently asked questions
How many seconds are in a year?
One year equals 31,556,952 s. s = yr × 31,556,952
What is the formula to convert years to seconds?
The formula is s = yr × 31,556,952. It is an exact definition rather than an approximation, so the conversion never drifts no matter how large the number.
How do I convert seconds back to years?
Divide instead of multiplying: one second is 3.16887e-08 yr. The reverse converter is linked in the related tools list.
Is this conversion exact?
Yes. Both units are defined against the same base unit by international agreement, so the factor is exact — any rounding you see is only in the display, which you can widen by entering more decimal places.
Is this years to seconds free to use?
Yes. Every calculator on the site is free, needs no sign-up, and runs entirely in your browser, so your figures never leave your device.
What people search for
This page answers each of these searches. They are the exact phrases visitors use to find the years to seconds.
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About this calculator
Written and reviewed by The Samsung Calculator editorial team. Every calculator is written against a published formula, reviewed against at least one independent reference implementation, and dated when it changes.
Last reviewed August 19, 2026 · Calculation runs client-side · No data collected · Report an error