Free Online Fees Drag Calculator

What this expense ratio and fees drag calculator shows

This expense ratio calculator shows what a yearly fee does to an investment over many years. It runs your plan twice with the same money going in: once at the return you enter and once at that return minus a yearly fee, such as a fund's expense ratio or an adviser's charge. The difference between the two final values is the fees drag, the money that fees take from your future balance.

Fees look small because they are quoted as a percentage per year: 0.1%, 1%, 2%. The calculator turns that percentage into money. With a $100,000 lump sum, a 7% return before fees and 30 years, a 1% yearly fee leaves $574,349 instead of $761,226. That is $186,876, about a quarter of the final value, from a fee that never looks like more than 1%.

The tool is useful when you choose between two funds that track the same market, compare an index fund with an actively managed one, or decide whether an adviser's fee is worth what it costs. It is a teaching tool, not a forecast: the return is the same every year, and fees are the only cost modelled. Everything runs in your browser, and nothing you enter is sent anywhere.

In this guide:

• How to fill in each field and read the results, the chart and the table
• The formulas behind the numbers, and what the calculator leaves out
• What an expense ratio is, what funds charged in 2025, and what an advisory fee costs over time
• A reference grid of how much of the final value fees take
• Three worked examples in US dollars and common mistakes

If the idea of returns earning their own returns is new to you, read the article on compound interest and the time value of money first. Fees work the same way, in reverse.

How to use the fees drag calculator

The calculator opens in US dollars with an initial investment of $10,000, a monthly contribution of $500, an annual return before fees of 8%, an annual fee of 1% and a 20-year period. The examples in this guide keep USD. The UAH / USD / EUR switch sits in the header of the Your numbers panel on wide screens and under More options on phones and tablets. Only the symbol and formatting change; nothing is converted.

Each input has a number box and a slider, in this order:

1. Initial investment. The amount invested at the start. The slider runs to 100,000 in USD or EUR and to 2,000,000 in UAH.
2. Monthly contribution. The amount added at the end of every month. Enter 0 for a lump sum on its own. The slider runs to 5,000 in USD or EUR and to 100,000 in UAH.
3. Annual return (before fees). The yearly return you assume before any fee, in percent.
4. Annual fee. The yearly fee in percent of the balance. If you pay more than one ongoing fee, enter the total. The Index fund, Average fund and Active mgmt chips under the slider set 0.1%, 1% or 2%, and a chip is highlighted when the fee matches it.
5. Investment period. The number of whole years.

You can type values beyond a slider's range. Values outside a range are pulled back to its limit, and the period is rounded to whole years. On phones, the two money fields use − and + buttons instead of a slider, in steps of 1,000 and 50 in USD or EUR; the rates and the period keep their sliders.

Reading the results

On wide screens the results stay in view to the right of the inputs. The headline, Lost to fees after N yrs, is the total fees drag: the value without fees minus the value with fees. A bar under it splits the value without fees into what you keep (navy) and what fees take (amber). Three figures follow:

• Value without fees is the final balance at the full return before fees.
• Value with fees is the final balance at the return minus the fee, with its share of the no-fee value in brackets.
• Effective annual return is the return before fees minus the annual fee.

The Chart tab starts at year 0 and has three series: a solid Without fees line, a shaded With fees area and a dotted Fees drag area that shows the gap growing. The Year by year tab lists Year, Without fees, With fees, Yearly fees and Cumulative drag at the end of each year. Cumulative drag in the last row equals the headline.

With the defaults, the headline shows $38,644, Value without fees is $331,109, Value with fees $292,465 (88.3% of the no-fee value) and Effective annual return 7%. Money is shown in whole units.

Pin to compare keeps the current inputs as a reference. The headline then shows the difference in drag, such as −$34,536 vs pinned when you pin the defaults and click Index fund, the chart adds the pinned With fees balance as a dashed line, and a Pinned scenario caption lists the pinned fee, return, period and drag. Switching the currency, Reset or a reload clears it. PDF exports the inputs, the four results (including Total fees drag) and the yearly table, without the pinned scenario. Share shares a link to the page without your numbers, and Reset restores the defaults, including US dollars. On phones and tablets, the results sit in a bar fixed to the bottom of the screen; Details opens the figures, the tabs and the buttons.

How the calculation works

The calculator works month by month and keeps two balances side by side. Both start with the initial investment and both receive every monthly contribution. The only difference is the rate at which they grow.

From yearly rates to monthly growth

Effective annual return = R − F
g = (1 + R ÷ 100)^(1/12) − 1
n = (1 + (R − F) ÷ 100)^(1/12) − 1

• R is the Annual return (before fees) and F the Annual fee, both in percent
• g is the monthly growth rate without fees and n the monthly growth rate with fees, which is negative when the fee is higher than the return

The monthly rates are chosen so that twelve months of growth give exactly the yearly rate. A lump sum at 8% therefore grows by exactly 8% a year, and with a 1% fee by exactly 7%.

Month by month

Without fees: B(k) = B(k − 1) × (1 + g) + C
With fees:    W(k) = W(k − 1) × (1 + n) + C
Cumulative drag after year y = B(12y) − W(12y)
Yearly fees in year y = drag after year y − drag after year y − 1

• B and W are the two balances, starting at the initial investment
• C is the Monthly contribution, added after the month's growth
• k is the month number, from 1 to the period times 12

The year-end values of B and W fill the table and the chart. The final ones are Value without fees and Value with fees.

What the drag numbers include

Total fees drag is not the sum of the fees you were charged. It is the gap between two end values, so it holds two parts: the fee taken from the balance each month, and the growth those fees would have earned had they stayed invested. Splitting the defaults with the same monthly math (a calculation added for this guide), about $22,409 of the $38,644 drag is fee and about $16,235 is lost growth.

The Yearly fees column works the same way. With the defaults, in year 1 it shows $127, almost all of it fee. By year 20 it shows $5,365, of which only about $2,609 is that year's fee; the rest is the growth that the earlier gap would have earned. The column is the yearly increase in the gap, which is why it grows faster than the balance.

Assumptions behind the numbers

• A steady return. The return before fees is the same every year, with no market swings.
• One fee, taken from the return. The fee is subtracted from the yearly return, so a 1% fee on an 8% return leaves 7%. A fund that charges 1% on the balance after it has grown 8% would leave about 6.92%, so on that basis the calculator slightly understates the cost.
• Equal contributions at month end. Both portfolios get the same amount at the end of every month. No fee is taken from contributions on the way in.
• No other costs. Commissions, sales loads, spreads, trading costs inside a fund and account charges are not modelled.
• No taxes and no inflation. All values are nominal and before tax.
• A fee above the return shrinks the balance. When the fee equals the return before fees, the money already invested stops growing; when the fee is higher, the effective return is negative and that money shrinks every year, while Total fees drag keeps rising with the fee.
• Rounded display. Money is shown in whole units and percentages with up to two decimals. The math itself is not rounded.

What an expense ratio is and how to read it

An expense ratio is the yearly cost of owning a fund, expressed as a percentage of the money in it. The SEC's Mutual Fund and ETF Fees and Expenses bulletin (Investor.gov, July 23, 2025) describes it as the total annual fund operating expenses, expressed as a percentage of the fund's average net assets.

Expense ratio = total annual fund operating expenses ÷ average net assets × 100
Yearly cost in money ≈ expense ratio × your balance

You never pay it as a bill. The costs are deducted from the fund's assets, so they show up as a slightly lower return. That is how the calculator treats a fee too: it is taken from the return, not charged separately.

Every US mutual fund and ETF prospectus contains a standardised fee table. The lines that make up the expense ratio, and some costs that sit outside it, are:

The SEC bulletin also warns that some funds advertise zero or very low expense ratios while other costs are collected elsewhere, for example as commissions or a wrap fee paid to an adviser. To use the calculator well, add up every ongoing percentage fee you pay, such as the fund's expense ratio and any advisory or platform fee charged as a percentage of assets, and enter the total as the Annual fee. The types of investment assets article explains how funds differ from holding shares or bonds directly.

Typical expense ratios in 2025

How high is too high for an expense ratio? The most complete data on US funds comes from the Investment Company Institute's yearly report, Trends in the Expenses and Fees of Funds, 2025 (March 2026). Its averages are asset-weighted, which means a fund with more money counts for more:

The same report shows how much the averages hide. Weighting every equity mutual fund share class equally, the simple average expense ratio was 1.08% and the median 0.99%, more than twice the asset-weighted 0.40%. Investors have put most of their money into cheap funds, but plenty of expensive funds are still on offer: one equity fund share class in ten charged 1.84% or more. The report also finds that the average expense ratio of equity mutual funds fell 62% from 1996 to 2025, and that 92% of gross sales of long-term mutual funds in 2025 went to no-load funds without 12b-1 fees.

The calculator's three fee chips span this range. Index fund (0.1%) is close to what broad index funds and ETFs charge. Average fund (1%) is close to the median equity fund on offer, not to where the average dollar is invested. Active mgmt (2%) is above what nine in ten equity fund share classes charge, and is closer to a fund fee and an advisory fee stacked together. These figures will change when ICI publishes its next yearly report.

Index funds are cheap because they follow a published list of securities instead of paying analysts to pick them. The article on what indices are explains how they work.

The cost of a 1% fee over 30 years

The single most useful number about fees is how much of the final value they take. Here $100,000 is invested once at 7% a year before fees and left for 30 years. Without any fee it grows to $761,226. Every row comes from the calculator:

The share lost is the drag divided by the value without fees, calculated for this guide. Three patterns stand out:

• The share lost is many times the fee. A fee quoted as 1% a year takes 24.5% of the final value, because it is charged every year on a growing balance.
• Each step costs a little less than the one before. Going from 1% to 2% raises the share lost from 24.5% to 43.2%, less than double, because a larger fee leaves less to take. The first fractions of a percent are the most expensive per point.
• Small differences still count. Moving from 0.25% to 0.05% keeps an extra $40,989 on $100,000, the difference between two index-style funds.

Why time makes it worse

The same 1% fee on $10,000 at 7% before fees costs $643 after 5 years, $1,763 after 10, $6,625 after 20, $18,688 after 30 and $46,887 after 40. Each decade adds more dollars of drag than the one before. As a share of the value without fees, that is 4.6%, 9.0%, 17.1%, 24.5% and 31.3%. Fees therefore matter most to investors with long horizons. The article on risk and return explains why a long horizon is also what makes higher-return investments bearable.

Advisory fees: is a 1% or 2% fee worth it

Advisory fees are a separate layer. The SEC's How Fees and Expenses Affect Your Investment Portfolio bulletin (July 23, 2025) explains that an investment adviser who manages a portfolio may charge an ongoing annual fee based on the value of that portfolio. That fee comes on top of the expense ratios of the funds the adviser buys. A firm's fees are described in its Form CRS and, for advisory clients, its Form ADV.

Because the calculator takes one fee, stack the layers yourself. Here $500,000 is invested for 25 years at 6% a year before fees. Without any fee it grows to $2,145,935:

Whether advice is worth this is a personal question. Good advice can help with things a calculator does not see: a savings plan you actually follow, not selling in a panic, tax-efficient accounts, insurance and estate planning. The calculator shows the price side clearly. In this model, an adviser who charges 1% has to add one percentage point of return a year, through better results, avoided mistakes or tax savings, just to leave you where low-cost funds alone would have. Example 2 below shows that break-even.

Lump sums and monthly contributions

Fees hit a lump sum harder than money added over time, because the lump sum is exposed to the fee for the whole period while each monthly contribution is exposed only from the month it arrives. Investing $500 a month at 7% before fees, with no initial investment, the share of the final value lost to fees is:

Over 30 years, a 1% fee takes 16.7% of a monthly saver's final value, against 24.5% for a lump sum. That does not make fees harmless for savers: as the balance builds up, most of it is money invested years ago, which behaves like a lump sum. Late in a career almost the whole account is in that position, so the fee you pay in your fifties and sixties matters as much as the one you paid at the start. The dollar-cost averaging calculator explores investing on a monthly schedule in more detail.

How the calculator compares with the SEC example

The SEC bulletin above illustrates fees with $100,000 growing 4% a year for 20 years. It says the portfolio would be worth approximately $208,000 with a 0.25% annual fee, $198,000 with 0.50% and $179,000 with 1.00%. Entering the same inputs in the calculator gives slightly higher values:

The middle column is computed for this guide by charging the fee on the balance after a year of 4% growth, so the net yearly rate is 1.04 × (1 − fee) − 1, or 2.96% for a 1% fee. The calculator instead subtracts the fee from the return and uses 3%. The bulletin's rounded figures match the fee-on-balance column, which suggests it charges the fee on the grown balance. The calculator's simple subtraction leaves a little more: $1,398 on $100,000 over 20 years at 1%. The gap grows with higher returns, larger fees and longer periods, but it stays small next to the drag itself. Read the calculator's figures as a close, slightly favourable estimate of what a fee costs.

Fees drag at a glance

This grid shows the share of the final value lost to fees for a lump sum at 7% a year before fees. For a lump sum the share does not depend on the amount: $1,000, $10,000 or $100,000 lose the same percentage. Each cell is the calculator's Total fees drag divided by Value without fees.

Read across a row to see the effect of time and down a column to see the effect of the fee. Over 40 years a 2% fee takes more than half of what the portfolio would otherwise have been worth, while a 0.1% fee takes less than 4%. Compare the 0.1% and 1% rows: the gap between them, about 22 percentage points after 30 years, is what choosing a fund can be worth.

Worked examples

Each example uses USD and shows what the calculator returns.

Common mistakes when comparing fees

• Looking only at the percentage. A 1% fee sounds trivial, but over 30 years at 7% before fees it takes about a quarter of the final value.
• Counting one fee instead of all of them. Fund expense ratios, advisory fees and platform fees charged as a percentage of assets add up. Enter the total.
• Reading Total fees drag as fees paid. The drag includes the growth that the fees would have earned. That is the real cost, but it is not what appears on a statement.
• Comparing funds of different types. A bond fund and a small-company fund have different costs and different risks. Compare funds that hold similar things.
• Using the asset-weighted average as the typical fund. In 2025 the asset-weighted average for equity mutual funds was 0.40%, but the median share class charged 0.99%.
• Forgetting the costs outside the expense ratio. Sales loads, commissions and trading costs are not in the fee table total. A front-end load can be modelled by entering the initial investment after the load.
• Setting the fee at or above the return. The Effective annual return figure then shows zero or a negative figure, and the money already invested stops growing or shrinks: $100,000 with a 0% return and a 1% fee falls to $81,791 after 20 years. A real account would shrink the same way, so check that the return you entered is before fees and that the fee is really what you pay.

Limitations and next steps

The fees drag calculator answers one question clearly: if the same money earns the same return, how much does a yearly fee cost by the end? It cannot tell you whether a more expensive fund or adviser will earn more, and it does not model market swings, one-off costs, taxes, inflation, fees that change over time or a fee charged as a fixed amount. Its simple fee model also slightly understates the cost of a fee charged on the balance.

Use it to put a price on a fee, then look at the parts it leaves out:

• The compound interest calculator projects the same kind of plan at a single net return.
• The investment goal calculator shows how much more you would need to save to make up for a fee.
• The inflation impact calculator shows what the final value is worth in today's money.
• The FIRE calculator shows how the return you keep affects when you could stop working.

For background, read what investing is. For decisions about specific funds, accounts or taxes, compare the fee tables in the prospectuses and consider a qualified, independent adviser who discloses the full cost of their services in writing.