Conversion from Hour (h) to Second (s) and vice versa

Updated on by Stefan Banse

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

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Info about "Hour"

The hour (h) (Latin: hora) is not part of the International SI System of Units, but 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 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 then common system (duodecimal system), which was common at the time. The twelve-unit system may have originated historically from the fact that one the individual finger links (three links per finger without thumb) were used for counting. Of course, sundials could not be used at night, so that 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 that 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 now even more accurate atomic clocks with the duration of the earth's rotation, a leap second had to be inserted every 2 to 5 years, so that one hour then consists of 3,601 seconds.

Info about "Second"

The second (s) is the base unit for time in the international system of units (SI). the second is therefore the physical unit of time measurement.

All other units of time are derived from the second (e.g. 1 minute = 60 seconds, 1 second = 1,000 milliseconds).

Until the middle of the 20th century, the second was defined as the sixtieth part of a minute of the day divided into 24 hours of 60 minutes. The length of a day - and thus of a second - always appeared to be exactly the same, since the rotation of the earth was assumed to be uniform. It was not until 1934 that the long-held assumption that the Earth's rotation is not uniform was proven. Due solely to magma displacements beneath the Earth's mantle and tidal friction alone, the Earth's rotation gradually slows down and thus the astronomical length of the day becomes longer. It turned out that the continuously improved quartz clocks provided a more consistent measure of time than the Earth's rotation. For this reason, a leap second is now added every two to five years to synchronise all clocks with the day, which always becomes a few fractions of a second longer.

Since 1967, the second has been defined as 9,192,631,770 times the period of a microwave, which resonates with a selected transition between two energy levels in the Cesium atom in resonance. Based on this definition, it is called the atomic second. Atomic clocks are based on the exact measurement of this transition, and thus supersede quartz clocks in terms of accuracy.

Basis for conversion Hour (h) to Second (s)

The abbreviation for the "Unit of time Hour" is h. The abbreviation for the "Unit of time Second" is s.

Formula for the conversion of Hour (h) to Second (s)

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

 Conversion formula Hour to Second 

Determine the number of Second from Hour

Hour × 3600


Formula for the conversion of Second (s) to Hour (h)

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

 Conversion formula Second to Hour 

Determine the number of Hour from Second

Second × 0.000277777777778


Overview table: How many Hour are how many Second?

Hour hSecond s
0.01 h => 36 s
0.02 h => 72 s
0.03 h => 108 s
0.04 h => 144 s
0.05 h => 180 s
0.06 h => 216 s
0.07 h => 252 s
0.08 h => 288 s
0.09 h => 324 s
0.10 h => 360 s
0.20 h => 720 s
0.30 h => 1 080 s
0.40 h => 1 440 s
0.50 h => 1 800 s
0.60 h => 2 160 s
0.70 h => 2 520 s
0.80 h => 2 880 s
0.90 h => 3 240 s
1 h => 3 600 s
2 h => 7 200 s
3 h => 10 800 s
4 h => 14 400 s
5 h => 18 000 s
6 h => 21 600 s
7 h => 25 200 s
8 h => 28 800 s
9 h => 32 400 s
10 h => 36 000 s
20 h => 72 000 s
30 h => 108 000 s
40 h => 144 000 s
50 h => 180 000 s
60 h => 216 000 s
70 h => 252 000 s
80 h => 288 000 s
90 h => 324 000 s
100 h => 360 000 s
200 h => 720 000 s
300 h => 1 080 000 s
400 h => 1 440 000 s
500 h => 1 800 000 s
600 h => 2 160 000 s
700 h => 2 520 000 s
800 h => 2 880 000 s
900 h => 3 240 000 s
1 000 h => 3 600 000 s

Overview table: How many Second are how many Hour?

Second sHour h
0.04 s => 0.00001 h
0.05 s => 0.00001 h
0.06 s => 0.00001 h
0.07 s => 0.00001 h
0.08 s => 0.00002 h
0.09 s => 0.00002 h
0.10 s => 0.00002 h
0.20 s => 0.00005 h
0.30 s => 0.00008 h
0.40 s => 0.00011 h
0.50 s => 0.00013 h
0.60 s => 0.00016 h
0.70 s => 0.00019 h
0.80 s => 0.00022 h
0.90 s => 0.00025 h
1 s => 0.00027 h
2 s => 0.00055 h
3 s => 0.00083 h
4 s => 0.00111 h
5 s => 0.00138 h
6 s => 0.00166 h
7 s => 0.00194 h
8 s => 0.00222 h
9 s => 0.00250 h
10 s => 0.00277 h
20 s => 0.00555 h
30 s => 0.00833 h
40 s => 0.01111 h
50 s => 0.01388 h
60 s => 0.01666 h
70 s => 0.01944 h
80 s => 0.02222 h
90 s => 0.02500 h
100 s => 0.02777 h
200 s => 0.05555 h
300 s => 0.08333 h
400 s => 0.11111 h
500 s => 0.13888 h
600 s => 0.16666 h
700 s => 0.19444 h
800 s => 0.22222 h
900 s => 0.25000 h
1 000 s => 0.27777 h

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