# Conversion from Year (yr) to Hour (h) and vice versa

Updated on by Stefan Banse

Here you can convert the Time unit Year into the unit Hour and vice versa you can convert Hour into Year. By clicking the "Swap units" icon, you will always obtain the desired conversion in the calculation result, i.e., yr to h or h to yr. With the following calculator you can also calculate any other Time unit.

A year (a) (Latin: annus) forms the time span of 365 days, or in the case of a leap year, 366 consecutive days. Due to its varying length, the year is not a physical unit of time and thus not a unit of time in the international SI system of units.

In the time unit converter, a year is always calculated to be 365 days.

In astronomical terms, a year is defined as the duration of the Earth’s orbit around the Sun, which lasts 365.25 days on average. Due to the quarter of a day, a normal calendar year (common year) is defined as 365 days, which is replaced every four years by a leap year with 366 days.

In everyday life, the term "year" is understood to mean the period from 1st January to 31st December.

The hour (h) (Latin: hora) is not part of the International SI System of Units, but it is permitted for use with the SI. The hour is derived from the base unit second. This makes it a legal unit of measurement.

Here, 1 hour is equal to 3,600 seconds or 1 second is equal to 0.00027778 hours (3,600ths).

For thousands of years—before the hour was officially defined as 3,600 times a second—it was considered the 24th part of a day. But how did the day originally change to a division of the day into 24 hours? In ancient Egypt, sundials were used to divide the day into 24 hours based on the common system (duodecimal system) at the time. The twelve-unit system may have originated historically from the fact that one individual finger links (three links per finger without thumb) were used for counting. Of course, sundials could not be used at night, so the Egyptians used the course of 12 stars to divide the night into 12-time units. This means that even today, the day still has 24 hours.

The hour was only reverted to the basic unit of the second in the middle of the 20th century after it was established and the astronomical day or one revolution of the Earth, was becoming shorter and shorter, albeit only minimally. At the same time, quartz clocks were able to measure time more accurately, making the second the basic unit. To synchronise the present accurate atomic clocks with the duration of the earth's rotation, a leap second had to be inserted every 2 to 5 years for one hour to make 3,601 seconds.

## Basis for conversion Year (yr) to Hour (h) and vice versa

The abbreviation for the "Time unit Year" is yr. The abbreviation for the "Time unit Hour" is h.

## Formula for the conversion of Year (yr) to Hour (h) and vice versa

The calculation from Year to Hour shall be made using the following conversion formula:

Conversion formula Year to Hour

Determine the number of Hour from Year

Year × 8760

## Formula for the conversion of Hour (h) to Year (yr)

The calculation from Hour to Year shall be made using the following conversion formula:

Conversion formula Hour to Year

Determine the number of Year from Hour

Hour × 0.00011415525119991

## Overview table: How many Year are how many Hour?

Year yr ⇒ Hour h
0.01 yr  are  87.60000 h
0.02 yr  are  175.20000 h
0.03 yr  are  262.80000 h
0.04 yr  are  350.40000 h
0.05 yr  are  438 h
0.06 yr  are  525.60000 h
0.07 yr  are  613.20000 h
0.08 yr  are  700.80000 h
0.09 yr  are  788.40000 h
0.10 yr  are  876 h
0.20 yr  are  1 752 h
0.30 yr  are  2 628 h
0.40 yr  are  3 504 h
0.50 yr  are  4 380 h
0.60 yr  are  5 256 h
0.70 yr  are  6 132 h
0.80 yr  are  7 008 h
0.90 yr  are  7 884 h
1 yr  corresponds to  8 760 h
2 yr  are  17 520 h
3 yr  are  26 280 h
4 yr  are  35 040 h
5 yr  are  43 800 h
6 yr  are  52 560 h
7 yr  are  61 320 h
8 yr  are  70 080 h
9 yr  are  78 840 h
10 yr  are  87 600 h
20 yr  are  175 200 h
30 yr  are  262 800 h
40 yr  are  350 400 h
50 yr  are  438 000 h
60 yr  are  525 600 h
70 yr  are  613 200 h
80 yr  are  700 800 h
90 yr  are  788 400 h
100 yr  are  876 000 h
200 yr  are  1 752 000 h
300 yr  are  2 628 000 h
400 yr  are  3 504 000 h
500 yr  are  4 380 000 h
600 yr  are  5 256 000 h
700 yr  are  6 132 000 h
800 yr  are  7 008 000 h
900 yr  are  7 884 000 h
1 000 yr  are  8 760 000 h

## Overview table: How many Hour are how many Year?

Hour h ⇒ Year yr
0.09 h  are  0.00001 yr
0.10 h  are  0.00001 yr
0.20 h  are  0.00002 yr
0.30 h  are  0.00003 yr
0.40 h  are  0.00004 yr
0.50 h  are  0.00005 yr
0.60 h  are  0.00006 yr
0.70 h  are  0.00008 yr
0.80 h  are  0.00009 yr
0.90 h  are  0.00010 yr
1 h  corresponds to  0.00011 yr
2 h  are  0.00022 yr
3 h  are  0.00034 yr
4 h  are  0.00045 yr
5 h  are  0.00057 yr
6 h  are  0.00068 yr
7 h  are  0.00079 yr
8 h  are  0.00091 yr
9 h  are  0.00102 yr
10 h  are  0.00114 yr
20 h  are  0.00228 yr
30 h  are  0.00342 yr
40 h  are  0.00456 yr
50 h  are  0.00570 yr
60 h  are  0.00684 yr
70 h  are  0.00799 yr
80 h  are  0.00913 yr
90 h  are  0.01027 yr
100 h  are  0.01141 yr
200 h  are  0.02283 yr
300 h  are  0.03424 yr
400 h  are  0.04566 yr
500 h  are  0.05707 yr
600 h  are  0.06849 yr
700 h  are  0.07990 yr
800 h  are  0.09132 yr
900 h  are  0.10274 yr
1 000 h  are  0.11415 yr

## Source information

As source for the information in the "Time units" category, we have used in particular:

## Last update on April 24, 2021

The last changes in the "Time units" category were implemented by Stefan Banse on April 24, 2021. The main changes were:

• April 24, 2021: Publication of the time units converter.
• Editorial revision of all texts in this category