Investment Fees Calculator — Cost of Fund Expenses
Discover the true long-term cost of annual investment fees. Enter your investment amount, expected return, annual fee and time horizon to see how much the fee reduces your final portfolio value versus investing fee-free.
%
%
years
Lost returns due to annual fees — the difference between gross and net portfolio values
325,159.17
Gross totalNet portfolio value
80.3%
Fee drag
19.7%
- 1
Gross monthly rate
r = 7% ÷ 12 = 0.005833 - 2
Net monthly rate
r_net = (7% − 1%) ÷ 12 = 0.005 - 3
Number of periods
n = 30 × 12 = 360 - 4
Gross portfolio value
10,000 × 8.1165 + 200 × (8.1165 − 1) ÷ 0.005833 = 325,159.17 - 5
Net portfolio value (after fees)
10,000 × 6.0226 + 200 × (6.0226 − 1) ÷ 0.005 = 261,128.76 - 6
Fee drag
325,159.17 − 261,128.76 = 64,030.41Returns permanently lost to the annual fee through compounding.
How does this calculator work?
Annual fees reduce your effective return rate. Net portfolio value = FV(r − fee); the fee drag = FV(r) − FV(r − fee). A 1% fee on a 30-year investment typically consumes 20–30% of gross returns due to compounding. Index ETFs (0.03–0.20%) leave far more in your pocket than actively managed funds (0.5–2%).
Formula
How this is calculated
An annual investment fee — called an expense ratio for funds — is charged as a percentage of the portfolio value each year. Because it is deducted continuously from the portfolio's growth rate, its effect is equivalent to reducing the annual return by the fee percentage. The calculator computes two parallel growth paths: the gross path at rate r (no fees) and the net path at rate r − fee. Both use the standard compound-interest formula with monthly compounding, including any regular contributions.
The fee drag — the difference between gross and net final values — grows non-linearly over time because the "missing" return from the fee is itself not compounded in the net portfolio. A 1% annual fee sounds small but over 30 years it commonly wipes out 20–30% of the returns that would otherwise have been earned. The donut chart shows the proportion of the gross portfolio that is consumed by fees.
This model approximates how most fund fees work in practice (applied to net asset value, reducing the effective return rate). It does not separately model transaction costs, entry/exit fees, bid-ask spreads, or taxes, all of which add to the total cost of investing. Real-world expense ratios (2025 values, editable): passive index ETFs often charge 0.03–0.20%; actively managed equity funds 0.5–2.0%; some hedge-fund-style products 2% management plus performance fees.
Frequently asked questions
Over short periods no, but over decades yes. On a £10,000 investment growing at 7% for 30 years, a 1% fee reduces the final balance from about £76,000 to £57,000 — a loss of nearly £19,000, which is 25% of the gross returns. The compounding of forgone returns is why even small fee differences matter enormously.
Broad market index ETFs from providers such as Vanguard, iShares or Fidelity typically charge 0.03–0.20% per year. Actively managed mutual funds often charge 0.5–1.5%, and some charge more. These figures were common as of 2025 and are editable in the calculator.
Yes. This calculator covers only the annual expense ratio (management fee). Real-world costs also include transaction commissions, platform fees, bid-ask spreads, taxes on dividends and capital gains, and any entry or exit loads. Add these to your fee estimate for a more complete picture.
Also known as
TG we-Calculate Editorial Team. (2026). Investment Fees Calculator — Cost of Fund Expenses [Online calculator]. TG we-Calculate. https://we-calculate.com/calculator/investment-fees-calculator
TG we-Calculate Editorial Team. "Investment Fees Calculator — Cost of Fund Expenses." TG we-Calculate. 2026. https://we-calculate.com/calculator/investment-fees-calculator.
TG we-Calculate Editorial Team, "Investment Fees Calculator — Cost of Fund Expenses," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/calculator/investment-fees-calculator
@misc{wecalculate_investment_fees_calculator, title = {Investment Fees Calculator — Cost of Fund Expenses}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/calculator/investment-fees-calculator}}, year = {2026}, note = {TG we-Calculate} }
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