What an Expense Ratio Is
An expense ratio is the annual fee a mutual fund or ETF charges shareholders, expressed as a percentage of assets. It is deducted from the fund's returns every day, so you never see a bill; your balance just grows slightly slower than the market. A 0.50% ratio on a $10,000 balance costs about $50 in the first year, and the dollar figure grows as the balance grows.
Because the fee is charged on the growing balance year after year, the drag compounds. That is why a fee that looks small can remove six figures from a long retirement portfolio.
The Math Behind the Number
The calculator runs the same starting amount at the same return for the same number of years, once with the fee and once without. The gap between the two final balances is the true cost of the expense ratio in dollars.
On $100,000 at a 7% return for 30 years, the table below shows how different fee levels change the ending balance. Every fraction of a percent compounds into real money.
| Expense Ratio | Ending Balance | Lost vs No Fee |
|---|---|---|
| 0% | $761,000 | $0 |
| 0.25% | $710,000 | $52,000 |
| 0.50% | $661,000 | $100,000 |
| 1.00% | $574,000 | $187,000 |
| 1.50% | $498,000 | $263,000 |
Cutting the Fee Drag
The cheapest way to cut the drag is to hold broad market index funds, where a total market or S&P 500 index fund carries an expense ratio in the low tenths of a percent or less. Actively managed funds often charge 1% or more, and most fail to beat their index over long periods.
Check the fee line of every fund in your 401(k), not just the fund name. Plan administrative fees sit on top of the fund's expense ratio, so read the full fee disclosure. When you have a choice between similar funds, the lower ratio usually wins, because future returns are unknowable and the fee is the one cost you can see in advance.
Frequently Asked Questions
How is expense ratio calculator calculated?
The formula is: Net value = principal x (1 + return - fee)^years. Enter your values above and click Calculate to see your personalized result instantly. The calculator simulates two identical portfolios: one growing at your expected return and one growing at that return minus the fund's expense ratio. On a $100,000 portfolio at a 7% annual return…
What inputs do I need for the expense ratio calculator?
You need: Principal, Annual Return, Years, Fee Rate. Default values are pre-filled — adjust them to match your personal finances for a customized result.
Is the expense ratio calculator free to use?
Yes — all TorchFI calculators are completely free. No registration, no email required. Calculations run entirely in your browser for maximum privacy. We never see or store your financial data.
How does the expense ratio calculator help with FIRE planning?
See what a fund expense ratio costs over time. Compare portfolio growth with and without fees and the dollars quietly lost to fund expenses. This calculator helps you make data-driven decisions about your financial independence journey instead of relying on guesswork.