[header] How to calculate capital growth [title] Know the initial investment. [step] Lets say you invested $100 in a share of a company. [title] After a month, the share price is $105. 
[step] So your monthly return can be calculated by a very simple formula. Return = (( final value-initial value)/initial value ) [title] So the monthly return would be (105-100)/100 which is equal to 5 %.