Interactive compound interest formula

Use the calculator below to show the formula and resulting compound interest calculation for your chosen figures. Note that this calculator requires JavaScript to be enabled in your browser.

Currency:
 
 
 
Principal amount (P):
$
 
 
Annual rate (r):
 
 
Compounds per year (n):
 
 
 
Years (t):
 
 
 
 
 
 
 
 
$
P
(
1 +
r
n
)
(
n
t
)
=
$
A
 
 
 
 
 

Compound Interest Calculator

Use my popular calculators to work out the compound interest on your savings, with monthly interest breakdowns and the option to include regular monthly deposits or withdrawals (for retirement calculations, etc). Use the second calculator to work out interest on a simple lump sum savings amount.

Currency:
 
 
 
Base amount (P):
$
 
 
Annual interest rate (r):
 
(%)
 
Calculation period (t):
 
 
Regular monthly (PMT):
$
 
 
Compound interval (n):