How to calculate annualised growth
I wrote a piece on it here:
For added effect, here is a calculator:


Going to Google Finance and querying your favourite ETF or share and seeing it grew by 150% over the last 10 years is awesome! Why? Because 150/10 is 15% growth on average every year, right? No... unfortunately not. The 150% over 10 years is compound growth. So how do you work it out?

Step 1: First, you need the end value of the stock (in cents). Let's say R25.00 which is 2500. 

Step 2: Then you need the starting value of the stock: R10,00 (or 1000).

Step 3: Get the year fractional value of 1/[years]. So in this example, it will be 1/10 or 0.1

Step 4: Subtract the starting value from the current value and divide that by the starting value:

(2500 - 1000)/1000 = 1.5 (this we'll call your return rate)

Step 5: Now add 1 to the return rate and raise it by the year fractional value (calculated in Step 3) and subtract 1 from the result:


Simplified it reads: (2.5^0.1)-1
Simplified some more: (1.0959)-1
And the result: 0.0959 (your annualised growth percentage). 

If you struggle to read it, multiply the number by 100: 9,59%

In Summary: 

Let's use real data - STX40 between 2 Jan 2004 and 30 Dec 2016 (13 years):

Starting value: 960
End value: 4382
Year fraction: 1/13 = 0.077

(4382-960)/960 = 3.56

((3.56+1)^0.077)-1 = 0.1239

Annualised growth: 12.39%

Thanks for this! I always wondered about it, but end up being to tired to go google myself.

OP updated with calculator link

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