Compound Interest Calculator
Discover the power of compound interest. See how your money can grow exponentially over time.
Enter your details
Adjust values to see your returns
The lump sum you're starting with.
Extra you add every month. Set to 0 for a lump sum only.
The S&P 500 has averaged ~10% annually before inflation.
Longer time horizons benefit most from compounding.
12 = Monthly, 4 = Quarterly, 1 = Annually, 365 = Daily
Your results
See how $10K grows to $20K
Future value
$37,405.09
Total contributed
$22,000
Total interest
$15,405.09
Investment growth over time
Watch your money grow year by year
What is compound interest?
Compound interest is the interest calculated on the initial principal and also on the accumulated interest from previous periods. It's often called "interest on interest" and is one of the most powerful concepts in personal finance. The more frequently interest compounds, the more you earn. This is why starting to invest early is so important: your money has more time to grow exponentially.
Future value
$37,405.09
Growth
$15,405.09