Calculator Panel
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What This Calculator Does
This tool isolates how an ETF's annual expense ratio erodes compound growth, demonstrating how small variations in fund fees create large gaps in long-term wealth.
How to Use This Calculator
Enter your initial investment, expected annual return, ETF expense ratio percentage, and years to invest. Click Calculate to project your net future balance and total fees paid.
How the Calculation Works
The underlying math engine processes your inputs using exact formulas. This systematic approach ensures professional, institutional-grade calculation precision:
Mathematical Formula
Formula Legend:
- · Gross Future Value is calculated using the raw annual return rate before expense ratios.
- · Total Fee Drag represents the difference between Gross Future Value and Net Future Value.
Practical Example
You invest $100,000 in an ETF with a 0.75% expense ratio and an expected annual return of 8.0% over 25 years:
Step-by-Step Mathematical Walkthrough:
- 1 Starting Principal = $100,000, Return = 8.0%, Expense Ratio = 0.75%, Years = 25.
- 2 Gross Future Value (8.0% return) = $684,847.52.
- 3 Net Future Value (7.25% return after fee) = $573,951.35.
- 4 Total Fees Paid = $110,896.17.
- 5 Fee drag reduces your final portfolio wealth by 16.19%.
Important Assumptions & Notes
- No additional deposits or withdrawals are made during the investment term.
- The annual return and ETF expense ratio remain completely constant.
- Fees are deducted continuously from the fund's assets (modeled as annual deductions here).
Common Mistakes or Considerations
- Ignoring expense ratios on active ETFs, assuming a 0.75% fee is 'small' when it actually deprives you of six-figure sums over a multi-decade investing horizon.
- Assuming ETF fees are billed directly to your account. Expense ratios are quietly deducted daily from the fund's net asset value, masking their impact.
Frequently Asked Questions
What is an ETF expense ratio?
An annual fee charged by an ETF sponsor to cover administrative, management, and marketing expenses, expressed as a percentage of your assets under management.
What is a good expense ratio for an ETF?
For passive index ETFs (tracking the S&P 500 or total stock market), a good expense ratio is below 0.10%. Many lead index ETFs charge as little as 0.03%.
Why are ETF fees lower than mutual fund fees?
ETFs are typically passive index trackers with lower administrative, compliance, and trading overhead, whereas mutual funds are often actively managed and require expensive research teams.