Interest Formula Help Please!!

Hey,

I forgot the formula for interest.

The formula sloves this:

Let say you got a savings account and you got $1,000 in it. The interest is 5% every month (i wish) so the formula is 1000 * 1.05 = B B= Balance

But next month it will be 1050 * 1.05 = B

Can you guys give me the formula for this. If i remember right it was like

startbalance [1 + interest ^ 2) * month] = newbalance

But that is wrong i think

Thanks for you help.

EDIT: I think it is this: StartBalance * (1+I)^ number of years