Compound Interest Calculator
See how your money grows over time with compound interest. Toggle inflation adjustment to see real purchasing power, and compare monthly vs. annual contributions.
Future Balance
$691,150
Total Growth
$501,150
on $190,000
Rule of 72
10.3 years
to double at 7%
Growth Multiple
3.6×
return on contributions
- Contributions
- Total Balance
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💡 Pro Tip: Read these articles alongside your calculator results for a complete understanding of the topic.
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Frequently Asked Questions
What is compound interest?
Compound interest is interest calculated on both the initial principal and the accumulated interest from previous periods. Unlike simple interest, it causes your money to grow exponentially over time.
How often does compounding matter?
The more frequently interest compounds, the faster your money grows. Daily compounding earns slightly more than monthly, which earns more than annual. For most savings accounts and investments, monthly compounding is standard.
What is the Rule of 72?
The Rule of 72 is a quick mental math shortcut: divide 72 by your annual interest rate to estimate how many years it takes to double your money. At 7% annual return, your money doubles roughly every 10.3 years.
How does inflation affect my returns?
Inflation erodes the purchasing power of your returns. A 7% nominal return with 3% inflation gives you a real return of about 4%. The inflation-adjusted toggle shows what your future balance is worth in today's dollars.
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