Your savings plan
$
$
%
yrs
Future value
$0
after 20 years
Total contributions
$0
Total interest earned
$0
Growth over time
How it's calculated
A = P × (1 + r/n)^(n×t)
P = initial principal ·
r = annual interest rate (decimal) ·
n = compounding periods per year ·
t = years
Monthly contributions are modeled using an equivalent monthly rate derived from the compounding frequency, so they compound alongside the principal.
Monthly contributions are modeled using an equivalent monthly rate derived from the compounding frequency, so they compound alongside the principal.
Key concepts
The terms behind the numbers above, explained simply.
Definition
The original sum of money — before any interest is added.
Definition
How often earned interest is added back to the balance so it starts earning interest itself. More frequent compounding (daily vs. annually) produces slightly higher returns for the same stated annual rate.
Definition
APR (Annual Percentage Rate) is the stated interest rate without accounting for compounding. APY (Annual Percentage Yield) reflects the actual return after compounding — so APY is always ≥ APR for the same account when compounding more often than once a year.
Definition
A quick mental-math shortcut to estimate how many years it takes an investment to double: divide 72 by the annual interest rate. At 6%, money roughly doubles in 72 ÷ 6 = 12 years.
Not financial advice. Finistack calculators are educational tools that estimate outcomes based on the assumptions you enter. They're not financial, tax, or legal advice, and Finistack is not a bank, CPA, or certified financial adviser.