Investment Fee Drag Calculator
See how much a fund’s annual expense ratio quietly costs you over decades — the gap between what you would have and what fees leave behind.
How it works
Fee drag = FV(gross) − FV(gross − fee) · each FV uses monthly compounding of the annual rate
An expense ratio looks tiny as a yearly percentage, but it is charged on your entire balance every year — including on gains it has already taken from you. Lowering the return by even half a point compounds against you across decades, so the money lost to fees grows far faster than the headline percentage suggests. Comparing a low-cost index fund with an expensive active one is often the single biggest lever an ordinary investor controls.
Worked example
Invest $50,000 plus $500 a month for 30 years at 8% gross. With no fee you would reach about $890,000; at a 0.75% fee the net 7.25% return lands near $770,000. The seemingly small fee has quietly consumed roughly $120,000 — around 13% of the pot.
Frequently asked questions
Is a 1% fee really a big deal?
Yes. Over a working lifetime a 1% annual fee can eat a quarter or more of your final balance, because it compounds against you every single year. It is often the difference between an index fund and an expensive actively managed one.
Does this include trading costs or advisor fees?
Enter whatever total annual percentage you pay. If an advisor charges 1% on top of a 0.5% fund fee, use 1.5% to see the combined drag. The math treats it all as a reduction to your yearly return.
Why is the loss bigger than fee × years?
Because the fee is deducted before the remaining balance compounds, you also lose all the future growth that money would have produced. That compounding of the lost amount is what makes the total far larger than a simple sum of the annual charges.
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Educational estimate, not investment advice. Markets involve risk of loss and future returns are never guaranteed.