Compound Interest โ Growth Over Time
Calculate your investment's future value with compound interest. Earnings on earningsโthe eighth wonder of the world.
Did our AI summary help? Let us know.
Rule of 72: years to double โ 72 รท rate Start earlyโtime is the key factor Monthly compounding yields more than annual Reinvest dividends for maximum growth
Ready to run the numbers?
Why: Compound interest accelerates wealth over time. Start early and contribute regularly.
How: FV = P(1+r/n)^(nt) + PMT ร [((1+r/n)^(nt)โ1)/(r/n)]. Principal + contributions grow with compounding.
Run the calculator when you are ready.
Sample Scenarios
Investment Details
Calculation Details
Investment Details
Results
Get AI-Powered Analysis
Get personalized investment recommendations.
For educational purposes only โ not financial advice. Consult a qualified advisor before making decisions.
๐ก Money Facts
Rule of 72
โ Doubling
~10yr double
โ Typical
Future value
โ Formula
Compound freq
โ Formula
๐ Key Takeaways
- โข Rule of 72: Years to double โ 72 รท rate (at 7%, double in ~10 years)
- โข Start early: Time is the most powerful factor
- โข Consistency matters: Regular contributions amplify growth
- โข Higher frequency helps: Monthly > annual compounding
- โข Reinvest dividends to maximize compounding
๐ก Did You Know?
๐ How Compound Interest Works
Compound interest means earning returns on your returns. Each period, you earn interest on the principal plus previously earned interest. Formula: FV = P(1 + r/n)^(nt) + PMT ร [((1 + r/n)^(nt) โ 1) / (r/n)] for contributions.
๐ฏ Expert Tips
Start Early
Even small amounts compound dramatically over decades.
Increase Contributions
Raise savings rate with raisesโavoid lifestyle creep.
Maximize Tax-Advantaged
401(k), IRA, HSA grow tax-free or tax-deferred.
Reinvest Dividends
DRIP (dividend reinvestment) accelerates compounding.
โ๏ธ Rule of 72 (Years to Double)
| Rate | Years to Double |
|---|---|
| 4% | ~18 years |
| 6% | ~12 years |
| 7% | ~10.3 years |
| 8% | ~9 years |
| 10% | ~7.2 years |
โ Frequently Asked Questions
What is the difference between simple and compound interest?
Simple: interest only on principal. Compound: interest on principal + prior interest. Compound grows faster.
Does compounding frequency matter much?
Yes, but diminishing returns. Monthly vs annual: small difference. Daily vs monthly: minimal.
What is APY vs APR?
APR = stated rate. APY = effective rate after compounding. APY is higher.
How do I maximize compound growth?
Start early, contribute regularly, reinvest dividends, use tax-advantaged accounts.
๐ By the Numbers
๐ Sources
โ ๏ธ Disclaimer: This calculator provides estimates. Actual returns will vary. Past performance does not guarantee future results.
Related Calculators
Long-Term Impact of Increased Return Calculator
Calculate the long-term impact of improved investment returns, fee reductions, and tax optimization. Analyze dollar differences, percentage improvements, fee...
InvestmentRecovery Return Calculator
Recovery Return Calculator - Calculate and analyze your financial decisions.
InvestmentShare Certificate Laddering Calculator
Calculate share certificate ladder returns across multiple terms. Analyze ladder strategy and optimize credit union investments.
InvestmentAsset Allocation Calculator
Optimize your investment portfolio allocation based on your age, risk tolerance, and investment goals. Get personalized recommendations and analyze your portfolio's risk-return profile.
InvestmentBond Value Calculator
Calculate bond present value, yield to maturity, duration, convexity, and price sensitivity. Analyze bond pricing, interest rate risk, and investment returns...
InvestmentCertificate of Deposit (CD) Analyzer
Analyze and compare CD rates and returns. Calculate interest earned, APY, and early withdrawal penalties. Compare CD options.
Investment