Monthly Compound Interest Calculator
Calculate compound interest compounded monthly — the most common frequency for savings accounts and investments. See the effective annual rate and how monthly compounding boosts your returns compared to annual compounding.
Monthly vs. Annual Compounding: What's the Difference?
When interest compounds monthly instead of annually, your effective annual rate (EAR) is higher than the stated nominal rate. This happens because each month's interest becomes principal for the next month's calculation.
Comparison at 8% nominal rate, $10,000 principal, 20 years
- Annual compounding: final balance = $46,610
- Monthly compounding: final balance = $49,268 (+$2,658)
- Daily compounding: final balance = $49,530 (+$2,920)
The difference grows significantly with larger principals and longer time periods. Always prefer an account with more frequent compounding when the nominal rate is the same.
Monthly Compound Interest FAQ
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About This Calculator & Financial Disclaimer
This tool was built to help users mathematically project their financial goals using standard formulas. The default variables provided are for educational purposes only and do not represent guaranteed future market performance.
Not Financial Advice: We are not certified financial planners (CFP) or investment advisors. The stock market involves risk, and inflation can vary drastically. Please consult a licensed professional before making major financial decisions, executing a 72(t) early withdrawal, or rebalancing your portfolio.