Expense Ratio Calculator

Written by Great Medico

Updated September 25, 2026 •2 min read

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Expense Ratio Calculator helps translate an investment assumption into a number you can inspect, rather than leaving the effect of compounding, fees, or risk buried in mental math.

What this calculator does

Expense Ratio Calculator projects the difference between a gross investment path and a fee-adjusted path to illustrate the long-term drag of the entered expense ratio. That makes the output useful for the specific relationship being measured here, while keeping any unentered business or investment assumptions outside the calculation.

How to use it

Enter Currency, Initial investment, Yearly investment, Duration, Expected return, and Expense ratio. Keep percentage assumptions in the units shown on the form and make sure the time unit of rates matches the term or period count. The currency selector changes display currency only; it does not perform an exchange-rate conversion. Before using the result in a decision, recheck unusually large or negative values against the source data rather than assuming the calculator is correcting an inconsistent input.

How the calculation works

The calculator projects a gross path using the entered return and a net path after subtracting the expense ratio from the annual growth assumption. Each year’s contribution is added before the yearly growth step. The difference between gross and net projected values is reported as fee drag.

Example

Using the default $10,000 initial investment, $1,000 yearly additions, 7% expected return, 0.2% expense ratio, and 10-year duration, the calculator compares a gross path with a fee-adjusted path. The gap at the end is the modeled expense-ratio drag.

How to interpret the result

Interpret the result as a modeled finance quantity, not a forecast or recommendation. Returns, rates, correlations, cash flows, fees, taxes, and market prices can change, so the most useful practice is to test a range of plausible inputs rather than treating one scenario as certain.

Limitations and notes

The calculation uses a simplified annual step for contributions, return, and expense ratio. Actual fund expenses are reflected in NAV over time and investment returns are not constant. Taxes, trading spreads, adviser fees, and cash-flow timing are outside the model unless entered elsewhere.