Compound Interest Calculator

Discover how your investments can grow exponentially over time with compound interest

Precise calculations
Real-time projections

Investment Details

The initial amount you're investing
Additional amount invested each month
Expected annual return on your investment
How long you plan to invest

Calculate Your Investment Growth

Enter your investment details in the form to see how compound interest can work for you over time.

Investment Tips

Start Early

Time is your greatest asset. Starting just 5 years earlier can double your investment returns due to compound growth.

Automate Investments

Set up automatic monthly contributions to make investing effortless. Increase contributions as your income grows.

Diversify Holdings

Spread risk across different asset classes. Consider low-cost index funds for broad market exposure.

Investment Strategy Guide

Building wealth through compound interest requires understanding key investment principles:

Dollar-Cost Averaging
Invest regularly regardless of market conditions to reduce timing risk and build discipline.
Asset Allocation
Balance stocks, bonds, and other investments based on your age, goals, and risk tolerance.
Tax-Advantaged Accounts
Use 401(k)s, IRAs, and HSAs to maximize your investment returns through tax benefits.

Investment Timeline

20s
Start investing
30s
Increase contributions
40s
Peak earning years
50s
Catch-up contributions
60s
Pre-retirement planning

Frequently Asked Questions

What is compound interest?

Compound interest is earning interest on both your original investment and previously earned interest. It's often called the "eighth wonder of the world" because of its powerful growth effect over time.

How often should interest compound?

More frequent compounding is better. Daily compounding slightly outperforms monthly, which outperforms annually. However, the difference becomes less significant with higher contribution amounts.

What's a realistic annual return rate?

Historically, the stock market has averaged about 10% annually before inflation. Conservative investors might use 7-8%, while aggressive investors might assume 8-12%. Always account for inflation and fees.

Should I pay off debt or invest?

Generally, pay off high-interest debt (credit cards, personal loans) first, then invest. For low-interest debt like mortgages, investing often provides better long-term returns.

Important Disclaimer

This calculator provides estimates based on the information you provide. Actual investment returns can vary significantly due to market volatility, fees, taxes, and other factors. Past performance does not guarantee future results. Consider consulting with a qualified financial advisor for personalized investment advice.

Free Compound Interest Calculator - See Your Money Grow (2025) | MyWealthForge