Compound Interest Calculator
See how your savings can grow over time with the power of compound interest. Project your future wealth with monthly contributions, inflation adjustment, and tax considerations.
Future value • Monthly contributions • Inflation adjusted • 100% Free📊 Your Investment Details
Enter your savings, contributions, and assumptions to project your compound interest growth.
📈 Your Growth Projection
See your future value, total contributions, and the power of compound interest.
📊 With Compound Interest
📊 Without Compound Interest
Based on 7% annual return, 20 years, compounded 4 times per year.
Compound Interest Visualized
See your balance grow over time and compare compound vs. simple interest side by side.
📈 Balance Growth Over Time
📊 Compound vs. Simple Interest
Compound Interest by the Numbers
See how different rates, time periods, and contributions affect your growth.
| Monthly Contribution | Rate | Years | Future Value | Interest Earned |
|---|---|---|---|---|
| $500 | 7% | 20 | ~$260,000 | ~$140,000 |
| $1,000 | 7% | 20 | ~$520,000 | ~$280,000 |
| $500 | 10% | 20 | ~$380,000 | ~$260,000 |
| $500 | 7% | 30 | ~$610,000 | ~$430,000 |
| $1,000 | 10% | 30 | ~$2,280,000 | ~$1,920,000 |
Assumes quarterly compounding, starting with $10,000 initial principal. Results are estimates and may vary based on actual market conditions.
Compound Interest Insights
Key concepts to understand about compound interest and wealth building.
The Eighth Wonder
Albert Einstein famously called compound interest the "eighth wonder of the world." It's the ability for your interest to earn interest, creating exponential growth over time.
Time Is Your Greatest Asset
The longer your money compounds, the more powerful the effect. Starting early — even with small amounts — can dramatically outpace larger contributions made later in life.
Rate Matters
A seemingly small difference in return rate (e.g., 7% vs. 10%) can result in hundreds of thousands of dollars in additional wealth over 30+ years. Every percentage point counts.
Frequency Amplifies Growth
More frequent compounding (daily vs. annual) accelerates growth. Daily compounding can add thousands of dollars to your portfolio over long time horizons.
Frequently Asked Questions
Common questions about compound interest and how this calculator works.
