A selection of free resources on time (calculators, exercises, games, quizzes, course reminders) that allow you to learn how to calculate with days, hours, minutes and seconds.

**Time** is a physical measure, its unit of measurement in the international system is the second noted s.
It can also be expressed in days noted d, hours noted h, minutes noted min, seconds noted s.

The relations between all its durations, are the following:

These relations allow to make conversions between these different units of time.

h:min:s | d | h | min | s |
---|---|---|---|---|

120:00:00 | 5d | 120h | 7200min | 432000s |

96:00:00 | 4d | 96h | 5760min | 345600s |

72:00:00 | 3d | 72h | 4320min | 259200s |

48:00:00 | 2d | 48h | 2880min | 172800s |

24:00:00 | 1d | 24h | 1440min | 86400s |

12:00:00 | 0.5d | 12h | 720min | 43200s |

01:00:00 | 0.041666666666667d | 1h | 60min | 3600s |

00:45:00 | 0.03125d | 0.75h | 45min | 2700s |

00:30:00 | 0.020833333333333d | 0.5h | 30min | 1800s |

00:15:00 | 0.010416666666667d | 0.25h | 15min | 900s |

00:01:00 | 0.00069444444444444d | 0.016666666666667h | 1min | 60s |

Time is used in the calculation of many physical measurements such as average speed or pace.

The average speed it is expressed in meters per second (m/s) in the international system, it is often expressed in km/h. The speed converter will allow you to make speed conversions in different units: kilometers per hour (km/h), meters per second (m/s), miles per hour (mph), feet per second (fps), knots (kn).

The pace is the time taken to cover 1 km, it is possible with the help of calculators to determine the pace from the average speed or to transform a pace into speed.

- average_speed : average speed calculator . The calculator returns a speed in km/h from a distance and a duration, or from a pace (duration necessary to cover 1 kilometer).
- convert_speed : Speed conversions. The speed converter allows online conversions to :.kilometers per hour, meters per second, miles per hour, feet per second, knots
- hours_calculator : hours calculator. Time calculator that allows you to make hourly calculations and time conversions using the h:min:s (hours, minutes, seconds) format.
- pace_to_speed : pace to speed converter. The calculator allows you to convert a pace (time needed to cover 1 kilometer) into speed expressed in km/h.
- speed_to_pace : speed to pace converter . Pace calculator from a speed in km/h, the pace is the time to cover a distance, usually expressed in min/km or min/mile.
- time_converter : time converter. Time calculator that can convert durations into seconds, minutes, hours and days.

- Duration calculation game (time): This game on time calculations allows to practice manipulating durations expressed in days, hours, minutes, seconds (d, h, min, s).
- time conversion game (time): This game allows you to practice making conversions on days, hours, minutes, seconds (d, h, min, s).
- the little math quiz (time): The little math quiz collects a set of small fun math exercises to do online for 7-11 year olds.

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