Expense Ratio Calculator

Estimate how a fund expense ratio reduces long-term investment growth and compare one fee level with a lower-cost alternative.

Last updated 3 April 2026

Fund fee drag planner Estimate how an annual expense ratio compounds against returns over time and compare one fund fee level with another.

Initial investment Annual contribution

Gross annual return (%) Expense ratio (%)

Holding period (years) Comparison expense ratio (%) (optional)

Contribution timing

Display currency

Change the reporting currency without changing the fee-drag assumptions.

Currency

Result

$205,191.75

Projected ending balance after a 0.85% annual expense ratio over 15 years.

Cumulative fees: $13,059.02
Fee drag vs gross growth: $19,336.42
Gross ending balance: $224,528.17
Growth after fees: $90,191.75

Lower-cost comparison A 0.15% expense ratio would finish with $15,784.17 more than the primary fee assumption.

Contribution summary

Total contributions over the projection equal $115,000.00. The model compounds at a gross return of 7% before applying the ongoing fee drag from the expense ratio.

Checkpoints

Year	Net balance	Cumulative fees	Fee drag
1	$32,688.33	$244.46	$251.82
8	$101,342.59	$4,103.77	$5,121.77
15	$205,191.75	$13,059.02	$19,336.42

About this calculator

General-reference calculator Reviewed 22 March 2026 Updated 3 April 2026

Editorial responsibility

Calcipedia editorial team

This page is maintained against the site trust model for its topic and updated when formulas, sources, or guidance materially change.

Formula provenance

Formula notes are kept in the page explanation when a named standard or reference materially affects the result.

Methodology

Projects a gross-growth path and a fee-adjusted growth path from the same initial investment, contribution schedule, return assumption, and holding period, then derives cumulative fees, fee drag, and optional low-cost comparison savings from the difference between those paths.

Limitations

Models ongoing expense-ratio drag only and does not include loads, taxes, turnover costs, tracking error, or account-level advisory fees.
Assumes the gross return and the expense ratio remain constant for the full projection horizon.
Uses a simplified periodic-fee simulation to show long-horizon cost impact rather than a prospectus-specific fund-cost methodology.
This is an educational comparison tool only and not investment advice or a recommendation of any specific fund.

Disclaimer

Use this result to compare long-horizon fee drag only. Before choosing a fund, review the current prospectus, strategy fit, tax considerations, and all other costs that may apply.

Formula notes

FINRA — Mutual funds — High-trust investor guidance on expense ratios, loads, and other recurring mutual-fund costs.
FINRA — Using the FINRA Fund Analyzer — High-trust investor guide to comparing the long-term impact of fund expenses.
FINRA — Investment returns — High-trust investor guidance supporting long-horizon return comparison and the importance of costs in net outcomes.

Change notes

Change note: this page's updated date changes only when the formula, labels, examples, or user guidance materially changes. Cosmetic or deploy-only edits do not refresh the date.

See our calculation methodology and editorial standards, plus the editorial contact route, for how this estimate is produced and corrected.

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Fund Fees

Expense ratio calculator guide: fund fee drag, cumulative costs, and low-cost comparison

An expense ratio calculator shows how a fund's annual operating fee can reduce long-term investment growth even when the fee percentage looks small. That is important because an expense ratio is charged every year against assets in the fund. The drag compounds over time, which means the total cost is more than just one year's fee multiplied by the number of years invested.

Why small fee differences can matter so much

An expense ratio is a recurring percentage charge taken from fund assets to cover management and operating costs. Because the fee is charged against the invested balance rather than against the original contribution only, it reduces not just current assets but also the future compounding base those assets would otherwise have created.

That is why two funds with similar holdings but different expense ratios can diverge materially over long holding periods. The higher-cost fund has to outperform by enough to offset the fee handicap before the investor ends up in the same place as the lower-cost alternative.

How this calculator models fee drag

The model starts with the initial investment, adds any recurring contributions, compounds the balance at the gross annual return assumption, and then applies the expense ratio as an ongoing asset-based drag. It also runs a parallel no-fee growth path so the final fee drag can be shown directly.

If an optional comparison expense ratio is entered, the tool runs the same contribution and return assumptions with the lower or higher comparison fee level. That lets the result focus on one practical question: how much ending wealth is being given up because of the fee difference alone?

Fee drag = Gross ending balance - Net ending balance

Measures the total wealth lost to recurring fund fees over the full holding period.

Cumulative fees = Sum of periodic fee deductions

Tracks the running total of expenses taken from the account over time.

Ending balance difference = Comparison balance - Primary balance

Shows how much more or less the account could end with under an alternative expense ratio.

Why fee drag is not the same as total fees paid

Total fees paid is the direct sum of the expense deductions themselves. Fee drag is broader. It includes both those deductions and the growth those dollars would have earned if they had remained invested. That is why fee drag usually ends up larger than the raw cumulative fee total over longer horizons.

This distinction helps explain why investors often focus on fee percentage differences that look small on paper. Over many years, the lost compounding on the deducted fees can become just as important as the fees themselves.

What this fee model does not cover

The calculator does not include loads, taxes, bid-ask spread, turnover costs, tracking error, or changes in contribution schedule or return assumptions. It also treats the entered expense ratio as stable for the full projection horizon even though real fund costs can change over time.

Use the result as a planning comparison tool only. If you are evaluating a specific fund, confirm its current prospectus fee table and look beyond expense ratio alone to portfolio fit, tax treatment, and implementation costs.

Further reading

FINRA — Mutual funds — High-trust investor guidance explaining expense ratios and other ongoing fund costs.
FINRA — Using the FINRA Fund Analyzer — High-trust investor guide to comparing fund expenses and their effect on account value over time.

Frequently asked questions

Why is fee drag larger than the fees themselves?

Because once a fee is deducted, that money is no longer invested and cannot compound in future years. Fee drag therefore includes both the direct fee deductions and the lost growth on those deducted amounts.

Does a lower expense ratio always mean the better fund?

Not automatically. Lower cost is usually helpful, but fund strategy, tax treatment, tracking quality, and fit with your portfolio still matter. The expense ratio is one important input, not the only one.

Does this calculator include sales loads or trading commissions?

No. It models ongoing annual expense-ratio drag only. Loads, account fees, and trading costs would need to be reviewed separately.

Why compare two expense ratios using the same return assumption?

Because that isolates the cost effect. Holding return and contribution assumptions constant makes it easier to see how much of the ending-balance difference comes from fees rather than market behavior.

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