It's call the Present Value, and Excel has a PV function for this purpose.
If, for example, you are paying $50/month for 5 years at 3%/year interest,
the PV is calculated as =PV(3%/12,60,-50). (Note that you use 3%/12 and 5*12
months to reflect the monthly payments).

"Ozborne787" wrote:

I've been trying to get my excel 2000 to help me with caculating the total
sum that I need to pay today instead of paying a premium each month for 60
months if you take the interest rate of 3 per cent/year away. I'm not sure
that this is called in english but anyway the whole lumpsum today times the
interes rate for 5 years is more then the total sum you get when you devide
the payment up in 60 months with interest rate. What I need to calculate is
what the lumpsum should be today if I want it to be the same total after 5
years as the one with monthly payment for 60 months and what function I use
for that.
Please ask me if you think I am being a bit unclear here and I´ll try to
explain better...

--
Hmmm