How many years are in one second?

There are 3.16887385 × 10⁻⁸ years in 1 second.

How do you convert years to seconds?

Multiply the number of years by 31,556,952 — or use the formula s = yr × 31,556,952.

What is 30 years in seconds?

30 years is 946,708,560 seconds. 30 × 31,556,952 = 946,708,560 seconds.

Is the years to seconds conversion exact?

The factor 31,556,952 is a rounded value because at least one of these units is defined by measurement rather than by an exact definition.

Years to Seconds Converter

Convert years to seconds instantly with this free years to seconds converter. Enter any value to get an accurate time conversion, plus the formula, the conversion factor and a full reference table.

What is 1 year in seconds?

1 year is equal to 31,556,952 seconds.

1 × 31,556,952 = 31,556,952 seconds

Amount

Result31,556,952

1 year = 31,556,952 seconds

Years to Seconds formula

s = yr × 31,556,952

The years to seconds conversion factor is 31,556,952 (rounded). 1 year = 31,556,952 seconds, and 1 second = 3.168873851 × 10⁻⁸ years.

Worked examples

2 years = 63,113,904 seconds — 2 × 31,556,952 = 63,113,904 seconds
30 years = 946,708,560 seconds — 30 × 31,556,952 = 946,708,560 seconds
100 years = 3,155,695,200 seconds — 100 × 31,556,952 = 3,155,695,200 seconds

Years to Seconds conversion table

Every value below is calculated with the exact conversion factor and rounded for display.

years to seconds conversion table
Years (yr)	Seconds (s)
1 yr	31,556,952 s
2 yr	63,113,904 s
5 yr	157,784,760 s
10 yr	315,569,520 s
15 yr	473,354,280 s
30 yr	946,708,560 s
45 yr	1,420,062,840 s
60 yr	1,893,417,120 s
90 yr	2,840,125,680 s
100 yr	3,155,695,200 s
365 yr	11,518,287,480 s
1,000 yr	31,556,952,000 s

When you need to convert years to seconds

Converting durations in project plans, billing sheets and race results.
Setting timeouts, cache lifetimes and cron intervals in software.

Common mistakes to avoid

Dividing when you should multiply. Because 1 year = 31,556,952 seconds, the answer should be larger than the number you started with.
Rounding too early. Convert first at full precision, then round the final answer to the precision the task actually needs.

How precise does the answer need to be?

Round only at the end, and only to the precision your task actually needs. The converter above keeps full double precision internally and rounds for display.

How these units are defined

Year (yr): An average Gregorian year (365.2425 days). The accepted value is a measured or conventional figure rather than an exact definition, so the factor shown is rounded.
Second (s): The SI base unit of time. This unit's relationship to the SI base unit is exact by definition, so no rounding enters the conversion factor.

Frequently asked questions

What is 1 year in seconds?: 1 year is equal to 31,556,952 seconds.
How many years are in one second?: There are 3.16887385 × 10⁻⁸ years in 1 second.
How do you convert years to seconds?: Multiply the number of years by 31,556,952 — or use the formula s = yr × 31,556,952.
What is 30 years in seconds?: 30 years is 946,708,560 seconds. 30 × 31,556,952 = 946,708,560 seconds.
Is the years to seconds conversion exact?: The factor 31,556,952 is a rounded value because at least one of these units is defined by measurement rather than by an exact definition.