Weekly Interest Calculator
Calculate how your money grows with weekly compounding interest and visualize your financial growth
Investment Results
Total Contributions
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Total Interest Earned
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Final Balance
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Detailed Breakdown
Weekly Interest Rate:
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Total Weeks:
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After-Tax Return:
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Inflation-Adjusted Value:
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Projection Timeline (First 12 weeks and last 12 weeks)
| Week | Balance | Interest | Contribution | New Balance |
|---|---|---|---|---|
| Enter values to see projection | ||||
| ... | ||||
💵 Comparison with Other Frequencies
| Compounding Frequency | Final Balance | Interest Earned | Difference |
|---|---|---|---|
| Weekly | -- | -- | Base |
| Monthly | -- | -- | -- |
| Quarterly | -- | -- | -- |
| Annually | -- | -- | -- |
| Simple Interest | -- | -- | -- |
Note: All scenarios use the same parameters (principal, contributions, rate, and time period).
💰 Smart Investing Tips
Start Early
Thanks to compounding, money invested earlier has more time to grow. A small amount now can outperform larger contributions later.
Consistency Matters
Regular weekly contributions create discipline and take advantage of dollar-cost averaging in volatile markets.
Minimize Fees
Even 1% in fees can reduce your final balance by 25-30% over 30 years. Choose low-cost index funds.
Tax Efficiency
Use tax-advantaged accounts (401k, IRA) to protect your returns from taxes and accelerate growth.
Rebalance Regularly
Maintain your target asset allocation to manage risk as your investments grow.
Automate Investments
Set up automatic transfers to ensure consistent investing without emotional decisions.
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Note: This calculator provides estimates only. Actual investment returns will vary based on market conditions, fees, and other factors. This tool does not constitute financial advice.