Expense Ratio Calculator

See the real long-term cost of fund fees — how much an expense ratio quietly takes from your returns over the years.

Investment

Annual Return (%)

Expense Ratio (%)

Years

Frequently Asked Questions

What is an expense ratio?

The annual percentage a fund charges to cover management and operating costs. A 1% ratio means $10 per $1,000 invested each year, deducted automatically.

Why do small fees matter so much?

Fees compound against you. Over decades, even a 1% difference can cost a large share of your final balance, as the chart shows.

How can I reduce fees?

Low-cost index funds and ETFs often charge far less than actively managed funds. Compare expense ratios before investing.

Understanding the Expense Ratio Calculator

A fund's expense ratio is the annual percentage of assets it charges to cover management and operating costs. This calculator shows how that seemingly small fee compounds into a large drag on returns over years and decades, comparing a low-cost fund against a higher-cost one with the same gross return. It is for index-fund and ETF investors, 401(k) and retirement savers, and anyone comparing two similar funds. Outputs are educational estimates; they illustrate fee impact, not the actual performance of any specific fund.

How it works

Enter your investment amount, expected annual gross return, the expense ratio (as a percentage like 0.04% or 0.75%), and the number of years. The net return each year is approximately gross return minus the expense ratio, because the fee is deducted from fund assets. The calculator compounds the net return over your horizon and reports ending balance, total fees paid, and the difference versus a fee-free or lower-fee alternative. Compare two expense ratios side by side to see the cumulative cost. Because fees are charged on the whole balance every year, the lost growth (opportunity cost) is far larger than the headline percentage suggests.

Net annual return ≈ Gross return − Expense ratio; Ending balance = Principal × (1 + Net return)^Years; Fee drag = Balance at gross return − Balance at net return

Worked example

Invest $100,000 for 30 years at an 7% gross annual return. With a 0.04% expense ratio, net return is about 6.96%, growing to roughly $755,000. With a 0.75% expense ratio, net return is about 6.25%, growing to roughly $615,000. The 0.71-percentage-point fee difference quietly costs about $140,000 over 30 years — far more than the small annual percentage implies — because the fee is levied on a growing balance every single year.

Tips & common mistakes

Expense ratios are deducted automatically from fund assets, so you never see a separate bill — the cost shows up as lower returns.
Even a 0.5% difference compounds into tens of thousands of dollars over decades on a six-figure balance.
Compare funds with similar holdings; a low fee on a poorly diversified fund is not automatically the better choice.
This estimate assumes a constant gross return; real returns vary year to year, which changes exact figures.
Check for additional costs not in the expense ratio, such as sales loads, 12b-1 fees, bid-ask spreads, and trading commissions.

Sources & methodology

• U.S. SEC Investor.gov — Mutual Fund Fees and Expenses (https://www.investor.gov/introduction-investing/investing-basics/glossary/mutual-fund-fees-and-expenses)
• SEC Office of Investor Education — How Fees and Expenses Affect Your Investment Portfolio (https://www.sec.gov/investor/alerts/ib_fees_expenses.pdf)

Reviewed by the TopOpenTools editorial team · Last updated June 2026. These tools provide general estimates for educational purposes only and are not financial, tax, insurance, investment, or medical advice. Verify important decisions with a qualified professional.