How do I convert years to seconds?

Multiply the year value by 31557600. So x yr × 31557600 = the equivalent in s.

What is 5 years in seconds?

5 years equals 157788000 seconds.

What is 10 years in seconds?

10 years equals 315576000 seconds.

What is 100 years in seconds?

100 years equals 3155760000 seconds.

How do I convert back from seconds to years?

Multiply the second value by 3.1688 × 10^−8. For example, 1 s = 3.1688 × 10^−8 yr.

Is the year bigger than the second?

Yes. 1 year is larger than 1 second — specifically 31557600 times larger.

Are these conversion factors exact?

Yes. The factor of 31557600 is derived directly from the SI definitions of year and second.

Years to Seconds Converter

1 yr = 31557600 s

1 year equals 31557600 seconds. To convert years to seconds, multiply the year value by 31557600. For quick reference: 1 yr = 31557600 s, 5 yr = 157788000 s, 10 yr = 315576000 s, 100 yr = 3155760000 s.

From

31557600

FormulaSeconds = Years × 31557600

Quick

How to convert years to seconds

Take your value
Start with your value in years.
Multiply by 31557600
Multiply the year value by 31557600. This is the exact conversion factor from years to seconds.
Read the result
The product is your value in seconds. For example, 5 yr × 31557600 = 157788000 s.

Conversion formula

The exact factor from years to seconds is 31557600.

Seconds = Years × 31557600

Years to Seconds conversion table

Fifty common reference values, hand-picked for skim utility. Use the calculator above for any value not listed.

Conversion table from years to seconds
Years (yr)	Seconds (s)
1 yr	31557600 s
2 yr	63115200 s
3 yr	94672800 s
4 yr	126230400 s
5 yr	157788000 s
6 yr	189345600 s
7 yr	220903200 s
8 yr	252460800 s
9 yr	284018400 s
10 yr	315576000 s
15 yr	473364000 s
20 yr	631152000 s
25 yr	788940000 s
30 yr	946728000 s
45 yr	1420092000 s
60 yr	1893456000 s
90 yr	2840184000 s
100 yr	3155760000 s
120 yr	3786912000 s
150 yr	4733640000 s
180 yr	5680368000 s
240 yr	7573824000 s
300 yr	9467280000 s
360 yr	11360736000 s
450 yr	14200920000 s
500 yr	15778800000 s
600 yr	18934560000 s
750 yr	23668200000 s
900 yr	28401840000 s
1000 yr	31557600000 s
1200 yr	37869120000 s
1500 yr	47336400000 s
1800 yr	56803680000 s
2400 yr	75738240000 s
3000 yr	94672800000 s
3600 yr	113607360000 s
4500 yr	142009200000 s
6000 yr	189345600000 s
7200 yr	227214720000 s
9000 yr	284018400000 s
10000 yr	315576000000 s
18000 yr	568036800000 s
36000 yr	1136073600000 s
43200 yr	1363288320000 s
86400 yr	2726576640000 s
172800 yr	5453153280000 s
604800 yr	19086036480000 s
1000000 yr	31557600000000 s
31557600 yr	995882117760000 s
100000000 yr	3.1558 × 10^15 s

Real-world reference

A common (non-leap) calendar year has 365 d. A leap year has 366 d. In seconds, that gives you: 1 yr = 31557600 s, 10 yr = 315576000 s, 100 yr = 3155760000 s.

Frequently asked questions

How many seconds are in 1 year?: 1 year equals 31557600 seconds.
How do I convert years to seconds?: Multiply the year value by 31557600. So x yr × 31557600 = the equivalent in s.
What is 5 years in seconds?: 5 years equals 157788000 seconds.
What is 10 years in seconds?: 10 years equals 315576000 seconds.
What is 100 years in seconds?: 100 years equals 3155760000 seconds.
How do I convert back from seconds to years?: Multiply the second value by 3.1688 × 10^−8. For example, 1 s = 3.1688 × 10^−8 yr.
Is the year bigger than the second?: Yes. 1 year is larger than 1 second — specifically 31557600 times larger.
Are these conversion factors exact?: Yes. The factor of 31557600 is derived directly from the SI definitions of year and second.

About the year and the second

The year

Convertitive uses the Julian year, defined as exactly 365.25 days × 86,400 s/day = 31,557,600 seconds. This is the IAU-standard year used for astronomical distances such as the light year. The Gregorian (calendar) year averages 365.2425 days — about 11 minutes shorter — and the tropical year (one full seasonal cycle) is about 365.2422 days.

The second

The second (s) is the SI base unit of time. It has been defined since 1967 in terms of the cesium-133 atomic transition, specifically as 9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the cesium-133 atom.