计算含 expense ratio 的真实回报。指数基金 0.03% vs 主动管理 1.5% 差 30%。
$6,000 ≈ max annual IRA contribution
S&P 500 historical: ~10%
Index funds: 0.03-0.20%; active: 0.5-1.5%
$190,000
7.50%
$780,326
$707,946
$72,380
9.3% of gross final value lost to fees
| Year | With gross return | After fees | Lost to fees |
|---|---|---|---|
| Year 1 | $16,800 | $16,750 | $50 |
| Year 2 | $24,144 | $24,006 | $138 |
| Year 3 | $32,076 | $31,807 | $269 |
| Year 4 | $40,642 | $40,192 | $449 |
| Year 5 | $49,893 | $49,207 | $686 |
| Year 10 | $108,509 | $105,493 | $3,016 |
| Year 15 | $194,634 | $186,299 | $8,335 |
| Year 20 | $321,181 | $302,307 | $18,875 |
| Year 25 | $507,120 | $468,851 | $38,270 |
| Year 30 | $780,326 | $707,946 | $72,380 |
Even a small expense ratio (0.5-1%) compounds dramatically over decades. On a 30-year horizon, the difference between a low-cost index fund (0.05%) and an average actively managed fund (1%) can exceed $100,000 on a $10k initial + $6k/year contribution. Our mutual fund calculator lets you compare scenarios side by side.
基金净值 7% 增长、不同 expense ratio 下的真实回报：
| 基金类型 | Expense Ratio | 30 年后余额 | vs 指数基金差额 |
|---|---|---|---|
| 指数基金（Vanguard VFIAX） | 0.04% | $75,401 | 基准 |
| 低费率主动基金 | 0.50% | $66,200 | −$9,201 |
| 高费率主动基金 | 1.50% | $52,485 | −$22,916 |
Expense ratio 看起来小，30 年复利下来差距巨大。指数基金历史上 90% 时间跑赢主动管理（SPIVA 报告）。S&P 500 长期年化 10%，扣除费用 7-9% 净回报。
Cross-checked against authoritative formulas (IRS, NIST, ACSM) and updated for 2025/2026 tax years and rates.
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FAQ
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A mutual fund calculator is a free investment planning tool that projects the future value of an investment in a mutual fund, factoring in the expense ratio (annual fee). Our mutual fund calculator takes initial investment, annual contribution, gross annual return, expense ratio, and time horizon, then projects both the gross and net balances year by year. The output shows the lifetime cost of fund fees — the gap between the gross and net values, which can be substantial over decades.
How it works
Our mutual fund calculator projects both gross and net (after fees) future values year by year, showing the lifetime cost of fund fees.
Type the initial amount and how much you'll add each year. A common starting point is $10k initial + $6k/year (max annual IRA contribution).
Type the gross annual return you expect from the fund (S&P 500 historical average is ~10%; conservative 7-8%). Then enter the fund's expense ratio — the annual fee deducted before you receive returns. Index funds run 0.03-0.20%; active funds run 0.5-1.5%.
Type how many years you'll let the investment grow. 30 years is typical for retirement planning; 10-15 years for shorter goals.
The mutual fund calculator shows the final balance with and without fees, the lifetime cost of fees in dollars and as a percentage of gross value, and a year-by-year table. Compare scenarios by adjusting the expense ratio to see how low-cost index funds stack up against actively managed funds.
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