Compound Interest Calculator
Model exponential growth using recursive interest logic. Map principal, rates, and monthly deposits to forecast long-term portfolio accumulation.
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Unable to calculate compound interest with the current values.
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About Compound Interest Calculator
Compound Interest Calculator estimates how money can grow when interest earns interest over time. It supports a starting principal, recurring monthly deposits, different compounding frequencies, and contribution timing so you can compare savings or investment scenarios quickly.
How To Use It
Enter the starting amount, annual rate, and time horizon, then adjust deposits and compounding if needed.
- Enter the principal, annual rate, number of years, and monthly contribution.
- Open More Options to change compounding frequency or contribution timing.
- Click Calculate Interest to review the ending balance, interest earned, and yearly schedule.
Examples
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Long-term savings
Input: Principal: 23000 Annual Rate: 2.5% Time: 10 years Monthly Contribution: 0 Compounded: Monthly Output: Ending Balance: about $29,524.91 Total Interest: about $6,524.91
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Monthly investing
Input: Principal: 5000 Annual Rate: 6% Time: 15 years Monthly Contribution: 200 Output: Review the ending balance, total contributions, and interest earned.
Real-World Usage Scenarios
- ETF Savings Plan Projection - Model the long-term growth of broad-market index funds by factoring in a starting lump sum and consistent monthly contributions over a 20-to-30-year horizon.
- High-Yield Savings Comparison - Evaluate how different compounding frequencies - such as daily versus monthly - affect the effective annual yield on liquid cash reserves.
- Retirement Fund Benchmarking - Estimate the future value of a pension or individual retirement account based on projected annual returns and adjusted monthly deposit scales.
- The Cost of Waiting Analysis - Compare two scenarios with different time horizons to visualize how delaying an investment by even five years significantly reduces the final ending balance due to lost compounding time.
Frequently Asked Questions
What is the difference between beginning and end of period contributions?
Contributing at the beginning of the period allows that specific deposit to earn interest during the current cycle, whereas end-of-period deposits only start earning interest in the following cycle.
How does compounding frequency impact the final total?
The more frequently interest is compounded (e.g., daily vs. annually), the faster the principal grows. This is because interest is added to the balance more often, forming a larger base for the next calculation.
Does the calculation account for taxes or inflation?
No, this tool provides gross nominal values. To account for purchasing power or net gains, you should subtract expected inflation or tax rates from your annual interest rate input.
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