Dollar Cost Averaging Investing Data Calculation

This tool calculates dollar cost averaging investing related data.

Choose the item to be calculated:

  FV    Time    RR    Sum

Monthly investments:
 dollar(s)
Time:
 year(s)
Annually rate of return:
 %
Future value of all monthly investments:

 dollar(s)
.

The following Chart shows the power of compouding effect.

Only the rate of return can not be factured out, so I used approximation which has the following JS code.

//time is in month and rate is in monthly rate.
function getrate(monthlyamount,futurevalue,time){
 var rate = 0.01;
 var change = 0.01;
 var estimaed;
 var diff;
    do {
	estimaed = (monthlyamount*(Math.pow((1 + rate),time)-1)/rate);
        diff = estimaed-futurvalue;
        if(diff>0){
            	change /= 2;
                rate -= change;
                estimaed = ((monthlyamount*(Math.pow((1 + rate),time)-1)/rate);
                diff = estimaed-dendamountd;
	}else if(diff<0){
                ratea += change;
                estimaed = (monthlyamount*(Math.pow((1 + rate),time)-1)/rate);
                diff = estimaed-dendamountd;
        }else{
               reutun rate
            }
     }while (Math.abs(diff) > 0.01);
  eutun rate
}