# Convert time

Updated on by Stefan BanseThe time converter helps you to convert all common time units into the one you are looking for. Behind the help buttons you will also find a lot of interesting information about the selected time unit.

## Time Calculator

How many seconds are 1.6 minutes? 3.2 hours are how many minutes? These and similar questions often present minor difficulties. Unlike many other units, time units are not always converted into each other using the familiar decimal system in the form of powers of ten, i.e. 10, 100, 1,000 etc. Years are 365 times the day, days are 24 times the hour, hours are 60 times a minute, which in turn is 60 times a second.

Only fractions of the basic unit for time, the "second", then follow again the familiar decimal system: tenths of a second, hundredths of a second, thousandths of a second, etc.

## Operator help

Enter the time unit to be converted and select from and into which time unit this value is to be converted. The time converter provides the common metric and astronomical time units for the calculation. Further information on the various time units is hidden behind the calculator's help buttons marked with a question mark.

## The different units of time

Below you will find information on all the time units that can be converted in the time converter.

### Millennium

A millennium (abbreviated ml) is a period of one thousand years. A millennium consists of ten centuries. Like the year itself, the millennium is not part of the international system of units.

### Century

A century (abbreviated c.) is a period of one hundred years. Ten centuries make up a millennium. Like the year itself, the century is not part of the international system of units.

### Decade

A decade is a period of ten years. Like the year itself, the decade is not part of the international system of units.

### Year

A year (a) (Latin: annus) forms the time span of 365, 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.

### Month

A month forms the time span of 28, 29, 30 or 31 consecutive days. Due to its varying length, the month is not a physical unit of time and thus not a unit of time in the international SI system of units.

### Week

Today, the week is a common unit of time of seven days in almost all cultures. However, it is neither a legal unit nor a physical unit of time in the sense of the international SI system of units, as seconds, minutes or hours are.

Here, 1 week is equal to 7 days, 1 day is therefore equal to 0.14286 weeks.

### Day

Although the day (d) (Latin: dies) is not part of the International SI System of Units, it is indirectly approved for use with the SI through its definition that a day has 24 hours of 60 minutes a 60 seconds, is indirectly permitted for use with the SI. This is because the second forms the official SI base value.

Thereby 1 day equals 24 × 60 = 86,400 seconds 1 second therefore equals 0.0000115741 days.

### 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).

### Minute

The minute (min) is not part of the SI International System of Units, but is approved for use with the SI. The minute is derived from the base unit second. This makes it a legal unit of measurement.

Thereby 1 minute equals 60 seconds or 1 second equals 0.0166667 minutes.

### 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).

### Tenth of a second

The unit tenth of a second or decisecond can be traced back to the basic unit second. Here, 1 tenth of a second corresponds to 0.1 seconds or 1 second corresponds to 10 tenths of a second. The prefix "Dezi" in the term decisecond thus stands for one tenth of the base unit second.

This unit belongs to the International System of Units (SI).

### Hundredth of a second

The unit hundredths of a second or centisecond can be traced back to the basic unit second. Here, 1 hundredth of a second corresponds to 0.01 seconds or 1 second corresponds to 100 hundredths of a second. The prefix "centi" in the term centisecond thus stands for one hundredth of the basic unit second.

This unit belongs to the International System of Units (SI).

### Millisecond

The unit millisecond or thousandth of a second can be traced back to the basic unit second. Here, 1 millisecond corresponds to 0.001 seconds or 1 second corresponds to 1,000 milliseconds. The prefix "milli" in the term millisecond thus stands for one thousandth of the base unit second.

This unit belongs to the International System of Units (SI).

### Microsecond

The unit microsecond can be traced back to the basic unit second. Thereby 1 microsecond corresponds to 0.000001 seconds or 1 second corresponds to 1,000,000 microseconds. The prefix "micro" in the term microsecond thus stands for one millionth of the base unit second.

This unit belongs to the International System of Units (SI).

### Nanosecond

The unit nanosecond can be traced back to the basic unit second. Thereby 1 nanosecond corresponds to 0.000000001 seconds or 1 second corresponds to 1,000,000,000 nanoseconds. The prefix "nano" in the term nanosecond thus stands for one billionth of the basic unit second.

This unit belongs to the International System of Units (SI).

### Other time units

There are numerous other SI time units that represent a fraction of the second. For this purpose so-called unit prefixes, i.e. prefixes for the second, are formed, as in the previous examples.

While with other units, such as the weight units the base unit "gram", this is not usual for the base unit of time, i.e. the second: "kilogram". second: "kiloseconds" or "megaseconds" tend not to be used, because in the case of time, the multiples of the second are not based on the decimal system and are therefore not usually represented as powers of 10. The multiples of the second are usually and famously represented as, for example, 60 times, 24 times or 365 times.

The following table gives an overview of the prefix usage for the fractions of a second:

Symbol | Name | Value | |
---|---|---|---|

s | Second | 10^{0} |
one second |

ds | Decisecond | 10^{-1} |
Tenth of a second |

cs | Centisecond | 10^{-2} |
Hundredth of a second |

ms | Millisecond | 10^{-3} |
Thousandth of a second |

µm | Microsecond | 10^{-6} |
Millionth of a second |

ns | Nanosecond | 10^{-9} |
Billionth of a second |

ps | Picosecond | 10^{-12} |
Trillionth of a second |

fs | Femtosecond | 10^{-15} |
Quadrillionth of a second |

as | Attosecond | 10^{-18} |
Quintillionth of a second |

zs | Zeptosecond | 10^{-21} |
Sextillionth of a second |

ys | Yoctosecond | 10^{-24} |
Septillionth of a second |

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## Source information

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

- Unit of time (Wikipedia)

## 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