The total interest paid to maturity would simply be

[pmt amount ] * [# pmts] - [principal amount]


"David" wrote:

Hi Group,

The Cumipmt function returns the cumulative interest paid given a set
interest rate, principle, periods, type and the time period you want to
cover. Does anyone know the algebra behind the function? And I am not realy
interested in "between" periods, but would be happy with the total paid to
maturity date. I was hoping to find a single formula like X= (1+i)^(n-1) or
somthing similar.

Thanks,
--
David