Fund Fee Drag Calculator
Two funds, identical contributions, different expense ratios. See in dollars what the fee quietly takes.
Balance trajectories over time
A 1% fee doesn't take 1% of your money. It takes 1% of your growth base every year, so the missing compounding snowballs. Each year the expensive fund grows a slightly smaller balance, and the gap between the two widens exponentially. That is why a fee that sounds tiny on a fund fact sheet can cost six figures over an investing lifetime.
Worked example: $500 a month for 30 years at an 8% gross return. A fund charging 0.03% finishes at about $740,657; the same portfolio in a fund charging 1.00% finishes at about $609,985. The fee gap of 0.97 percentage points costs $130,672, roughly 18% of the low-fee balance. You contributed $180,000 either way; the fee decided how hard it worked.
Frequently asked questions
Is subtracting the fee from the return accurate?
It's the industry-standard approximation and it matches reality to rounding-level precision. Funds actually shave about fee/365 off the net asset value each day, but over long horizons the difference versus subtracting the fee from the annual return is a few dollars on hundreds of thousands.
What counts as a high expense ratio?
Index funds commonly charge around 0.03%. Actively managed funds typically charge 0.50% to 1.00% or more. Watch for 12b-1 fees, which are marketing costs baked into the expense ratio rather than listed separately.
Do fees matter if the expensive fund performs better?
Only if it beats the cheap fund by more than the fee gap, every year, net of taxes. A 1% fee means the manager must find an extra 1% of return annually just to break even with the index fund, and most active funds don't clear that bar over long periods.
Why does the zero-fee case match the Compound Interest Calculator?
Both use the same math: monthly compounding at nominal APR/12 with contributions added at the end of each month. Set either fund's fee to 0% and the result equals the Compound Interest Calculator for identical inputs, which is a good sanity check on both tools.
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Calculators model hypothetical outcomes from the inputs you provide. They are informational only, not financial, investment, tax, or legal advice.