Convert one year to seconds

Explanation

To convert one year to seconds all we need is to know the conversion factor and we are done. Luckily, we can compute that factor using the units' definitions below.

The result is that there are 31536000 seconds in 1 year.

Formula

1 y = 31536000 s

yearsy

dimension	time
symbol	y

The year (y) is a unit of measurement of time.

The unit is based on a year of 365 days of 86400 seconds each and is therefore equal to a common year in the Gregorian calendar.

It is different from the tropical year (the actual year or complete cycle of seasons), the sideral year (the time taken by the Earth to orbit the Sun once with respect to the fixed stars) or the julian year (the average year in the Julian calendar).

Definition of the year

One year is equal to 31536000 seconds.

Equivalences

One year is also equivalent to:

Other multiple of a year

nanoyear	ny	0.000 000 001
microyear	µy	0.000 001
milliyear	my	0.001
year	y	1
kiloyear	ky	1000
megayear	My	1 000 000
gigayear	Gy	1 000 000 000

secondss

dimension	time
system	International system of units (SI)
symbol	s

The second (s) is the base unit of time in the International System of Units.

Definition of the second

It is defined by taking the fixed numerical value of the caesium frequency ∆ν_Cs, the unperturbed ground-state hyperfine transition frequency of the caesium-133 atom, to be 9 192 631 770 when expressed in the unit Hz, which is equal to s^–1.

From the BIPM: Unit of time

Equivalences

One second is equivalent to:

Some Facts

As of 2021, the world record for the 100 meters dash is held by the Jamaican Usain Bolt with a time of 9.58 seconds.

SI time units

picosecond	ps	0.000 000 000 001
nanosecond	ns	0.000 000 001
microsecond	µs	0.000 001
millisecond	ms	0.001
second	s	1
kilosecond	ks	1000
megasecond	Ms	1 000 000
gigasecond	Gs	1 000 000 000
terasecond	Ts	1 000 000 000 000

The International System of Units

The International System of Units or SI (from the French Système international (d'unité)), also called metric system in the U.S., is a coherent system of units that was published 1960. It is official in nearly every country.

The General Conference on Weights and Measures (Conférence générale des poids et mesures) is tasked with overseeing the SI.