Units of time

First, we show units of time that are more common organized as a concept web from the smallest unit to the greatest unit. See more explanations below.

Units of timeUnits of time


The basic units of time that we are familiar with from the smallest unit to the greatest unit are second, minute, hour, day, week, month, year, century, and millennium.  

Second is the smallest unit on the concept web. To see how fast a second is, do this exercise. Raise your hand up and immediately lower it down. It took you about a second to do this exercise!

60 seconds = 1 minute.

60 minutes  = 1 hour.

24 hours  = 1 day.

7 days = 1 week.


How many weeks are there in one month?

Well, it depends. Only February can have exactly 4 weeks on a leap year. Otherwise, February has 4 weeks plus 1 day.

The other months have either 4 weeks plus 2 days or 4 weeks plus 3 days. To understand what a leap year is, check this site.

12  months  = 1 year.

100 years  = 1 century.

10 centuries = 1 millennium.


Other less common units of time to mention just a few.

These are millisecond, microsecond, decasecond, fortnight, quarter, decade, olympiad, jubilee, and megaannum.

1 millisecond = 0.001 second.

1 microsecond = 0.000001 second.

1 decasecond = 10 seconds.

1 fortnight  = 2 weeks  (this one is mostly used in Great Britain and some former british colonies)

1 quarter  = 3 months.

1 decade  = 10 years.

1 olympiad = 4 years.

1 jubilee = 50 years (this one is used in the bible)

1 megaannum = 1 million year.








Page copy protected against web site content infringement by Copyscape

Recent Articles

  1. Average age word problem

    Aug 09, 16 01:40 PM

    Average age of Dipu and Apu is 22 years. Average age of Dipu and Tipu is 24 years. Age of Dipu is 21 years. What are the ages of Apu, and tipu ? Let

    Read More



New math lessons

Your email is safe with us. We will only use it to inform you about new math lessons.