Financial term · Reviewed August 17, 2026
Expense ratio
Expense ratio: An investment fund’s annual operating expenses expressed as a percentage of assets. The Expense Ratio Cost Calculator returns this figure from compare compound growth before and after an annual fee over the same horizon. At that calculator’s documented worked-example inputs the estimated value lost to fees is $113,556; holding every other input steady, moving gross annual return from 5.0% to 9.0% moves it from $72,052 to $177,461, a spread of $105,409.
The fee comes out every year, on the whole balance, whether the fund gained or lost. Over a long horizon it compounds against you in the same way returns compound for you, and the drag is larger than the annual number makes it feel. Half a percent a year sounds trivial. Across thirty years on a growing balance it is not trivial at all.
| Term | Expense ratio |
|---|---|
| Category | Investing & Returns |
| How it is found | Compare compound growth before and after an annual fee over the same horizon |
| Worked example | Estimated value lost to fees: $113,556 |
| Computed by | Expense Ratio Cost Calculator |
| Related terms | 8 defined in this glossary |
Before you rely on it
What to check
Add any platform or advice fee on top of the fund's own ratio.
The common error
Where people go wrong with expense ratio
Comparing funds on the published ratio while ignoring the wrapper. The total coming out is what matters, and a cheap fund on an expensive platform is not a cheap arrangement.
Worked through
Expense ratio in plain numbers
A fund charges 0.75% a year and another charges 0.05%. On $100,000, that is $750 against $50 in the first year, a $700 difference. Now stretch it over 30 years, assuming both funds earn 7% before costs and you add nothing more; the cheap fund grows at about 6.95% a year, reaching roughly $750,700; the expensive one grows at 6.25% and reaches about $616,200. The difference is around $134,500, all from a cost gap that looks tiny on a fact sheet. Fees compound against you in the same way returns compound for you.
Easily confused
Expense ratio and its neighbours
The expense ratio is not the whole cost of owning a fund; it covers management fees and operating expenses taken from fund assets. It does not include trading costs inside the fund, loads such as sales charges, advisory fees you pay separately or taxes; it is different from the management fee alone, which is one part. The total expense ratio, sometimes called the ongoing charges figure, is closer to the full annual cost. Compare funds of the same type, since an index fund and an actively managed fund have different typical ratios.
In real decisions
Where expense ratio turns up
Investors use it to compare funds and to choose between share classes; it is the most reliable predictor available of relative returns among similar funds, because costs are certain while performance is not. Retirement plan participants look at it when picking from a menu; advisors use it to justify or challenge a recommendation. Regulators require it to be disclosed. A simple habit is to check the ratio before buying any fund and to review holdings periodically as cheaper options appear.
Know the edges
Where expense ratio stops being reliable
A low ratio does not make a fund good. The index tracked, the tax efficiency and the fund's structure matter too. Ratios change, and waivers can hide a higher underlying figure. Extra costs can sit outside the ratio. The effect on returns is modest in a single year and large across decades, so the figure matters most for long holdings. Consider the total cost of the strategy, including any advisory fee.
Quick answers
What people ask about expense ratio
Is a low expense ratio always best? It is a strong starting point among similar funds, but also check the index or strategy, tracking accuracy and taxes. A slightly higher ratio can be worth it for a fund that delivers what you need.
Where do I find the expense ratio? In the fund's prospectus, fact sheet and on brokerage pages. Look for the total or net expense ratio.
Put it to work
How expense ratio is calculated
At the expense ratio cost calculator’s worked-example inputs, estimated value lost to fees is $113,556, ending value after fees is $429,187. Moving gross annual return from 5.0% to 9.0% moves that first figure from $72,052 to $177,461.
Open the Expense Ratio Cost Calculator →
Investment returns are uncertain; taxes, fees, volatility and cash-flow timing can materially change results.
Related vocabulary
Terms used alongside this one
Keep reading
Nearby in the glossary
- ← Exchange rate
- Face value →
- All 174 defined termsThe complete Free Calculators Online financial glossary.