How do I convert seconds to years?

Multiply the second value by 3.1688 × 10^−8. So x s × 3.1688 × 10^−8 = the equivalent in yr.

What is 5 seconds in years?

5 seconds equals 1.5844 × 10^−7 years.

What is 10 seconds in years?

10 seconds equals 3.1688 × 10^−7 years.

What is 100 seconds in years?

100 seconds equals 3.1688 × 10^−6 years.

How do I convert back from years to seconds?

Multiply the year value by 31557600. For example, 1 yr = 31557600 s.

Is the second bigger than the year?

No. 1 second is smaller than 1 year. It takes 31557600 seconds to equal 1 year.

Are these conversion factors exact?

Yes. The factor of 3.1688 × 10^−8 is derived directly from the SI definitions of second and year.

Seconds to Years Converter

1 s = 3.1688 × 10^−8 yr

1 second equals 3.1688 × 10^−8 years. To convert seconds to years, multiply the second value by 3.1688 × 10^−8. For quick reference: 1 s = 3.1688 × 10^−8 yr, 5 s = 1.5844 × 10^−7 yr, 10 s = 3.1688 × 10^−7 yr, 100 s = 3.1688 × 10^−6 yr.

From

3.1688 × 10^−8

FormulaYears = Seconds × 3.1688 × 10^−8

Quick

How to convert seconds to years

Take your value
Start with your value in seconds.
Multiply by 3.1688 × 10^−8
Multiply the second value by 3.1688 × 10^−8. This is the exact conversion factor from seconds to years.
Read the result
The product is your value in years. For example, 5 s × 3.1688 × 10^−8 = 1.5844 × 10^−7 yr.

Conversion formula

The exact factor from seconds to years is 3.1688 × 10^−8.

Years = Seconds × 3.1688 × 10^−8

Seconds to Years conversion table

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

Conversion table from seconds to years
Seconds (s)	Years (yr)
1 s	3.1688 × 10^−8 yr
2 s	6.3376 × 10^−8 yr
3 s	9.5064 × 10^−8 yr
4 s	1.2675 × 10^−7 yr
5 s	1.5844 × 10^−7 yr
6 s	1.9013 × 10^−7 yr
7 s	2.2182 × 10^−7 yr
8 s	2.5350 × 10^−7 yr
9 s	2.8519 × 10^−7 yr
10 s	3.1688 × 10^−7 yr
15 s	4.7532 × 10^−7 yr
20 s	6.3376 × 10^−7 yr
25 s	7.9220 × 10^−7 yr
30 s	9.5064 × 10^−7 yr
45 s	1.4260 × 10^−6 yr
60 s	1.9013 × 10^−6 yr
90 s	2.8519 × 10^−6 yr
100 s	3.1688 × 10^−6 yr
120 s	3.8026 × 10^−6 yr
150 s	4.7532 × 10^−6 yr
180 s	5.7039 × 10^−6 yr
240 s	7.6051 × 10^−6 yr
300 s	9.5064 × 10^−6 yr
360 s	1.1408 × 10^−5 yr
450 s	1.4260 × 10^−5 yr
500 s	1.5844 × 10^−5 yr
600 s	1.9013 × 10^−5 yr
750 s	2.3766 × 10^−5 yr
900 s	2.8519 × 10^−5 yr
1000 s	3.1688 × 10^−5 yr
1200 s	3.8026 × 10^−5 yr
1500 s	4.7532 × 10^−5 yr
1800 s	5.7039 × 10^−5 yr
2400 s	7.6051 × 10^−5 yr
3000 s	9.5064 × 10^−5 yr
3600 s	0.00011408 yr
4500 s	0.0001426 yr
6000 s	0.00019013 yr
7200 s	0.00022815 yr
9000 s	0.00028519 yr
10000 s	0.00031688 yr
18000 s	0.00057039 yr
36000 s	0.0011408 yr
43200 s	0.0013689 yr
86400 s	0.0027379 yr
172800 s	0.0054757 yr
604800 s	0.019165 yr
1000000 s	0.031688 yr
31557600 s	1 yr
100000000 s	3.1688 yr

Real-world reference

A standard heartbeat is about 1 s. Saying 'one Mississippi' takes about 1 s.

Frequently asked questions

How many years are in 1 second?: 1 second equals 3.1688 × 10^−8 years.
How do I convert seconds to years?: Multiply the second value by 3.1688 × 10^−8. So x s × 3.1688 × 10^−8 = the equivalent in yr.
What is 5 seconds in years?: 5 seconds equals 1.5844 × 10^−7 years.
What is 10 seconds in years?: 10 seconds equals 3.1688 × 10^−7 years.
What is 100 seconds in years?: 100 seconds equals 3.1688 × 10^−6 years.
How do I convert back from years to seconds?: Multiply the year value by 31557600. For example, 1 yr = 31557600 s.
Is the second bigger than the year?: No. 1 second is smaller than 1 year. It takes 31557600 seconds to equal 1 year.
Are these conversion factors exact?: Yes. The factor of 3.1688 × 10^−8 is derived directly from the SI definitions of second and year.

About the second and the year

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.

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.