Compound Interest Calculator
Calculate how your investments grow with compounding and regular contributions
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Final balance
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Total profit
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Total invested
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Return on investment
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What is Compound Interest?
Compound interest is the interest calculated on the initial principal and also on the accumulated interest of previous periods. It's often called "interest on interest" and is one of the most powerful forces in investing and saving.
How This Calculator Works
This compound interest calculator uses the formula A = P(1 + r/n)ⁿᵗ where:
- A — Final amount including interest
- P — Initial principal balance
- r — Annual interest rate (decimal)
- n — Number of times interest is compounded per year
- t — Time in years
Additionally, this calculator supports monthly contributions, making it ideal for retirement planning, savings goals, and investment projections.
Who Benefits from This Tool?
This tool is perfect for:
- Investors — Planning long-term investment strategies
- Savers — Calculating savings growth with regular deposits
- Financial planners — Demonstrating compounding effects to clients
- Students — Learning about financial mathematics
- Anyone — Looking to understand their financial future
Why Use Our Compound Interest Calculator?
- Free and unlimited — No sign-up required, use as much as you want
- Visual growth chart — See your investments grow over time
- Year-by-year breakdown — Detailed table showing yearly progress
- Monthly contributions — Realistic savings simulation
- Multiple compounding frequencies — Monthly, quarterly, semi-annually, or annually
- Privacy-first — All calculations happen in your browser
Understanding Your Results
When you use this calculator, you'll see four key metrics:
- Final balance — Total amount after the investment period
- Total profit — Total interest earned minus initial investment
- Total invested — Total amount you contributed (principal + deposits)
- Return on investment — Profit as a percentage of total invested
The chart shows how your balance grows over time, while the yearly breakdown provides detailed annual progress.