Compound Interest Predictor

Watch savings grow over 10, 20 and 40 years

Grades 7–12

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Grades 7–12 · Watch your money grow over time!

Principal ($)

Annual Rate (%)

Compounding

Years

Formula Used:

A = P(1 + r/n)^nt

A = $1,000(1 + 7%/12)^12×30

Compound Final Amount

$8,116

Interest earned: $7,116

Simple Interest (same rate)

$3,100

Interest earned: $2,100

✨ Power of Compounding

Compound interest earns $5,016 more than simple interest — that's interest on top of interest!

238.9% bonus from compounding

CompoundSimple

Year 10

$2,010

Simple: $1,700

Year 20

$4,039

Simple: $2,400

Year 30

$8,116

Simple: $3,100