Compound interest

Simple vs. compound interest
Examples of 5% and 10%

Future value (FV, or A) for compound interest =

P:    r:    t:    n:


FV=

Future value (FV, or A) for continuously compounded interest =

P:    r:    t:


FV=


Rule of 70: doubling time is approximately 70/r

Present value (P) for compound interest =

FV, or A:    r:    t:    n:


P=

Present value (P) for continuously compounded interest =

FV, or A:    r:    t:


P=

Time t for compound interest =

P:    FV, or A:    r:    n:


t=

Interest rate r for compound interest =

P:    FV, or A:    t:    n:


r=