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January 25th, 2010, 03:32 AM  #1 
Member Joined: May 2009 Posts: 90 Thanks: 0  Population Growth Rate Formula
Hi, I know how to find the population growth if a growth rate is given, but what's the formula to find the growth rate if only number of years and estimated population given....ie population now = 23600 and after 53 years will exceed 35000? Thanks...Mark 
January 25th, 2010, 04:30 AM  #2 
Global Moderator Joined: Dec 2006 Posts: 20,310 Thanks: 1981 
If the population is multiplied by a constant factor each year (which isn't a particularly realistic assumption), that factor would be calculated for your example as (35000/23600)^(1/53), i.e., 1.0075 to 5 significant figures. If the value 35000 is changed to 36000 and to 40000, the corrresponding growth factors are approximately 1.008 and 1.01 respectively. Thus, a small change in the growth factor makes a considerable difference to overall growth over a prolonged period of time. To convert the growth factor to an annual percentage growth rate, subtract 1 and then multiply by 100%. For 1.0075, this gives 0.75%, and for 1.01 gives 1%.

January 25th, 2010, 05:35 AM  #3 
Member Joined: May 2009 Posts: 90 Thanks: 0  Re: Population Growth Rate Formula
Check please (35000/23600)^(1/53) 1.007463589  1 = 0.007463589 x 100% = 0.746358928 = 0.75% growth percentage rate Many thanks...Mark 
January 25th, 2010, 11:04 AM  #4 
Global Moderator Joined: Dec 2006 Posts: 20,310 Thanks: 1981 
That needs an "=" symbol after the initial expression, a "%" symbol after "0.746358928", and the words "growth" and "percentage" interchanged.


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