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A mutual fund's expense ratio quietly reduces your effective return every single year — a seemingly small percentage that compounds into a real cost over decades.
This calculator projects your mutual fund balance net of the expense ratio, and shows exactly how much the fee costs you over time.
How it works
Enter your initial investment, monthly contribution, expected gross annual return, expense ratio, and years to grow. The calculator subtracts the expense ratio from the gross return to get a net return, then projects growth using the standard future value formula — comparing it against a fee-free scenario to isolate the cost of fees.
- Enter initial investment ($).
- Enter monthly contribution ($).
- Enter expected annual return, before fees (%).
- Enter fund expense ratio (%).
- Enter years to grow.
- Click Calculate to see your results.
Examples
$300/month for 20 years, 8% gross, 0.5% expense ratio
Investing $300/month for 20 years at an 8% gross return with a 0.5% expense ratio grows to about $188,423 — roughly $12,917 less than a fee-free fund would have produced.
Who should use it
- Comparing the long-term cost of two funds with different expense ratios.
- Understanding how much a fund's fees will cost over a specific investment horizon.
Industry applications
- Investment and retirement planning
- Financial advising and fee transparency
Advantages
- Directly shows the dollar cost of fees, not just an abstract percentage.
- Uses the same reliable future value formula as the site's retirement account calculators.
Limitations
- Doesn't account for taxes on dividends, distributions, or withdrawals.
Common mistakes to avoid
- Ignoring the expense ratio entirely when comparing similar funds, assuming a small percentage difference doesn't matter.
- Confusing the expense ratio with a one-time sales load or transaction fee — the expense ratio is charged annually, every year you hold the fund.
Best practices
- When comparing similar funds, prefer the lower expense ratio unless there's a strong track record of outperformance that clearly justifies the extra cost.
Tips
- Over a multi-decade investment horizon, a 1% difference in expense ratio can cost tens of thousands of dollars — small percentage differences compound just like returns do.