Compound interest calculator
See how contributions and compounding change an outcome.
Compound Interest
See how your investments grow over time.
Investment Details
Growth Summary
The Power of Compound Interest
Compound interest earns interest on both your original investment and previously earned interest, creating exponential growth over time.
Compound Interest Calculator, The Complete Guide
See your wealth grow with our free compound interest calculator. This investment growth calculator shows exactly how your money multiplies over time through the power of compounding, often called the eighth wonder of the world.
How Compound Interest Works
Compound interest earns interest on your interest. Unlike simple interest, compound returns accelerate over time. Our interest rate calculator shows how $10,000 at 7% annually becomes $19,672 in 10 years and $38,697 in 20 years.
Savings Calculator with Contributions
Our savings calculator includes monthly contributions. See how adding $500/month to your investments dramatically accelerates growth. Regular contributions combined with compounding create exponential wealth building.
Money Growth Calculator
Our money growth calculator includes visual charts showing your balance over time. See the hockey-stick curve of compound growth and understand why starting early matters more than the amount you invest.
Tips for Maximizing Compound Growth
- Start investing as early as possible, time beats timing
- Reinvest all dividends and interest to maintain compounding
- Increase contributions whenever your income grows
- More frequent compounding means faster growth
Related Tools
More than a quick compound interest calculator.
A compound interest calculator shows how an opening balance, regular contributions, an interest rate, and time interact. It is useful for exploring scenarios, comparing assumptions, and understanding why compounding becomes more noticeable over longer periods.
The result is illustrative. Actual investment returns, account fees, tax treatment, contribution timing, and interest calculations vary by product. Do not use this page as financial, tax, or investment advice.
How to use the compound interest calculator.
Start with the tool above. There is no account step between you and the result.
- 01
Enter the starting amount and contribution details.
- 02
Set an assumed rate and time period.
- 03
Compare the illustrated balance and contribution totals.
Compound interest calculator answers.
Useful context before you use the result somewhere important.
Is the final value guaranteed?
No. It is an illustration based entirely on the assumptions you enter.
Does this include fees or tax?
Not unless the inputs explicitly account for them. Consider them separately for a real decision.
Can I compare scenarios?
Yes. Change one input at a time to see how it affects the illustration.
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