Interactive financial calculator
Expense Ratio Calculator
Compare a no-fee projection with one or two fund expense ratios to estimate their effect on long-term investment value.
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Methodology & Assumptions
How this estimate is calculated
Projection: each fund's net annual return is approximated as gross return minus its expense ratio, then converted to an effective monthly rate. Contributions are added at month-end. The no-fee baseline uses the full gross return. Estimated fee drag includes both the modeled fee effect and the compounding that could have occurred on that difference.
Illustrative result: figures are rounded for display after calculations use full numeric precision. Actual results may differ.
Currency: dollar symbols are a display convention. Enter every monetary amount in one consistent currency; the calculator does not convert currencies or apply jurisdiction-specific tax rules.
What an Expense Ratio Calculator Shows
An expense ratio is an annual percentage charged by a fund. A small percentage can affect long-term value because it reduces both the current balance and the future compounding on that balance. This calculator compares a no-fee baseline with Fund A and, when entered, Fund B.
The model approximates each fund's net annual return as gross annual return − expense ratio. That net rate is converted to an effective monthly rate, and contributions are added at the end of each month. Real funds generally accrue expenses within daily net asset values, so the calculation is an understandable approximation rather than a statement of exact fund accounting.
Fee Drag Is More Than Cash Fees
The difference from the no-fee projection is labeled estimated fee drag. It includes the modeled reduction in value and the growth that could have compounded on that difference. It should not be read as literal cash fees paid. Taxes, trading costs, bid-ask spreads, tracking difference, advice fees, and changes in the fund's expense ratio are not included.
Worked Example: 0.10% Versus 1.00%
For a $100,000 initial investment held for 20 years with no contributions and a constant 7% gross annual return, the no-fee projection is about $386,968. Fund A at 0.10% projects to about $379,799, an estimated drag of $7,169. Fund B at 1.00% projects to about $320,714, an estimated drag of $66,255. Fund B finishes roughly $59,086 below Fund A under these assumptions.
How to Compare Funds Responsibly
Fees matter, but they are not the only selection factor. Compare investment objective, diversification, benchmark, tracking, risk, liquidity, tax treatment, currency exposure, and account rules. The same fund name or product structure can have different terms by market. Use the Compound Interest Calculator for a broader accumulation scenario or the Savings Goal Calculator for a target-based timeline.
Frequently Asked Questions
Does a zero expense ratio always mean no investment costs?
No. Other costs can include spreads, trading commissions, advice fees, platform fees, taxes, and tracking difference. This calculator isolates only the expense-ratio assumption entered.
Why can a small fee create a large long-term difference?
The fee reduces the amount remaining invested, and the foregone amount no longer compounds. Longer horizons and larger balances magnify that opportunity cost.
Can I use this for an ETF or mutual fund?
Yes, if the product reports an annual expense ratio or comparable ongoing percentage. Confirm what that published figure includes and avoid combining unlike fee measures without adjustment.
Is the projected return a forecast?
No. It is an illustrative constant-rate assumption. Actual investment returns vary, can be negative, and are not guaranteed by this calculation.