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.







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Recent Lessons

  1. Find water left in a tank using arithmetic sequences

    Jul 20, 17 10:41 PM

    A water tank is emptied at a constant rate. Initially, 36,000 gallons of water were in the tank. A the end of five hours, 16,000 gallons remained. How

    Read More