ETF Fee Calculator and Expense Ratio Comparison

How to use this calculator

Enter the starting balance, monthly contribution, gross annual return before fund expenses, each fund’s expense ratio, and the holding period. Use expense ratios from the current prospectus fee tables. The calculator subtracts each expense ratio from the gross return and compounds monthly.

When this calculator is useful

• Comparing the recurring cost of two ETFs or mutual funds
• Testing how the holding period changes fee drag
• Seeing why fee differences matter more as balances grow
• Checking the cost hurdle for a specialty or actively managed fund

Important limitations

This is a simplified pre-tax scenario. It treats the expense ratio as a steady reduction in return and does not reproduce daily fund accounting. It excludes bid-ask spreads, commissions, advisory and account fees, taxes, tracking difference, securities lending revenue, cash drag, and differences in holdings or risk.

For best results, run at least three cases: a conservative case, a middle case, and a stretch case. If a small change in inputs creates a big change in the answer, that is a sign the decision may be sensitive to rates, fees, timing, or market performance.

How this ETF fee calculator works

The calculator creates three paths using the same starting balance, monthly contribution, gross annual return, and number of years. One path has no expense ratio. The other two subtract Fund A’s or Fund B’s expense ratio from the gross return before monthly compounding.

Estimated fee drag is the gap between the no-expense ending value and a fund’s modeled ending value. That gap includes the return the deducted costs could have earned. It is not a prediction of the dollar expense line that will appear on an account statement.

Worked example: 0.05% versus 0.50% over 20 years

The example begins with $25,000, adds $500 a month, and assumes a steady 7% gross annual return. Total contributions are $145,000. Under those assumptions, Fund A finishes about $22,407 ahead of Fund B. Actual market returns will not arrive in a straight line, and two real funds may not earn the same gross return.

Why a small annual fee can create a larger long-term gap

An expense ratio reduces the assets left in a fund. The investor also gives up future growth on those deducted costs. The SEC’s investor bulletin uses the same basic lesson: ongoing fees that look small can have a large effect over time because the balance and the return earned on that balance are both lower.

Time and account size drive the dollar result. A 0.45 percentage-point difference is modest in one year on a small balance. The gap can widen as new contributions arrive and past cost differences compound. Change the holding period to compare five, ten, twenty, and thirty years rather than judging the fee from one annual percentage alone.

Where to find an ETF’s expense ratio

Use the fund’s current prospectus fee table. Investor.gov says total annual fund operating expenses are expressed as a percentage of average net assets and called the expense ratio. A shareholder report can also show actual fund costs for the reporting period, while a prospectus uses the current fee information required for the standardized example.

Check the exact share class or ticker. A fund family may offer products or share classes with different costs. Temporary fee waivers can also make a current net expense ratio lower than the gross expense ratio. Read the footnotes and note when a waiver expires.

Expense ratio versus the costs this model omits

The expense ratio does not capture every dollar an investor may pay. ETF trades can have a bid-ask spread and may trade above or below net asset value. A broker, adviser, retirement plan, or managed account may charge another fee. Taxes can differ across accounts and funds.

Tracking difference is broader than the stated expense ratio. A fund can trail or exceed its benchmark by an amount that reflects fees plus portfolio sampling, trading, taxes, cash, index changes, and securities-lending results. Compare official performance against the correct benchmark over matching periods instead of assuming the prospectus ratio explains every return difference.

How to make a fair fund comparison

1. Confirm that both funds pursue the exposure you need. Similar names do not guarantee similar holdings.
2. Copy each expense ratio from the current prospectus and check for fee-waiver footnotes.
3. Run the same return and contribution assumptions for both funds.
4. Compare the dollar gap over the period you expect to hold the investment.
5. Then review risk, liquidity, spreads, tracking, taxes, and account-level fees outside this calculator.

If the higher-cost fund has a different strategy, the calculator only shows the return hurdle created by the fee difference. It cannot tell you whether that strategy will overcome the hurdle. The compound interest calculator can test a general savings path, while the portfolio rebalancing calculator can help inspect allocation drift.

Sources and methodology

• Investor.gov: Mutual Fund and ETF Fees and Expenses — fee-table categories, expense-ratio definition, and costs outside the prospectus fee table.
• Investor.gov: How Fees and Expenses Affect Your Investment Portfolio — transaction versus ongoing fees and their effect on returns.
• Investor.gov: Expense Ratio — concise definition and where to find the ratio.
• FINRA: Fund Analyzer overview — comparison of product and account costs over time.

Method and sources reviewed September 14, 2026. Results are deterministic browser calculations. Monthly contributions are added before each month’s modeled return, and no personal inputs are stored.

Educational only. This calculator provides general information, not personalized investment, tax, legal, retirement, or trading advice.

Frequently asked questions

What is an ETF expense ratio?

Investor.gov defines the expense ratio as the percentage of a fund’s average net assets used each year to pay operating expenses. The figure appears in the fund prospectus fee table.

How do I compare two ETF expense ratios?

Use the same starting balance, contributions, gross return, and holding period for both funds, then enter each published expense ratio. The result isolates the modeled difference caused by the two ratios; it does not establish that the funds have equal holdings, risk, or gross performance.

Does an expense ratio come out of my account as a separate bill?

Usually not. Annual fund operating expenses are paid from fund assets and reduce investment returns indirectly. Other costs, such as brokerage or advisory fees, may be charged separately.

Does the calculator include bid-ask spreads and trading commissions?

No. The model only compares the two expense ratios entered. An ETF can also have trading costs, premiums or discounts to net asset value, taxes, and account-level fees.

Is the lower expense ratio always the better ETF?

A lower fee leaves a smaller cost hurdle, but fees are not the only comparison. Check the investment objective, holdings, index method, risk, liquidity, tracking, tax effects, and whether the products provide the same exposure.