Investment Expense Ratio Drag Calculator

How to use this investment expense ratio drag calculator

1. Initial portfolio: enter the amount in your selected currency. The worked example uses $50,000.00.
2. Gross annual return: enter a percentage using 5 to mean 5%. The worked example uses 7%.
3. Fund A annual fee: enter a percentage using 5 to mean 5%. The worked example uses 0.1%.
4. Fund B annual fee: enter a percentage using 5 to mean 5%. The worked example uses 1%.
5. Investment years: enter the quantity in years. The worked example uses 25 years.

Start with figures from the same statement date or planning period. Calculate once, save scenario A, then change one assumption to understand its effect. The comparison shows B minus A; a positive difference means the result increased, which is not automatically better.

Formula and calculation method

Ending value = principal × [(1 + gross return) × (1 − annual fee)]^years.

The calculator evaluates this relationship directly in your browser. The displayed precision is for readability and does not imply a guaranteed outcome. Time periods and rate conventions matter: use the exact units in each input label and avoid mixing monthly and annual values.

What the result means

Fees reduce the capital available to compound. The gap includes both the fees and the future growth those amounts could have earned; it is not just the sum of expense charges.

Two worked examples

1. Illustrative planning scenario

Initial portfolio = $50,000.00; Gross annual return = 7%; Fund A annual fee = 0.1%; Fund B annual fee = 1%; Investment years = 25 years.

Apply the stated formula with these inputs. Monetary examples use USD; percentages are divided by 100 inside the calculation. Intermediate calculations retain full precision and displayed amounts are rounded.

2. Simplified calculation check

Initial portfolio = $1,000.00; Gross annual return = 10%; Fund A annual fee = 0%; Fund B annual fee = 10%; Investment years = 1 years.

Apply the stated formula with these inputs. Monetary examples use USD; percentages are divided by 100 inside the calculation. Intermediate calculations retain full precision and displayed amounts are rounded.

The second example uses simpler inputs to make the arithmetic easier to check. It is also included in the automated regression suite. These examples illustrate the model and are not market averages, live offers or personalized advice.

Assumptions and limitations

Annual return applied before an annual proportional fee. Actual funds accrue expenses over time. No contributions, taxes, trading costs or performance difference between funds.

Use this output to frame a question or compare consistent scenarios. Reconcile any decision involving an actual product, employment agreement or financial statement with its underlying documents. If a contract uses different rounding or timing, its result may differ from this estimate.

Frequently asked questions

Sources and verification

The following primary sources provide background on the financial concepts. CalcPane’s formula and assumptions above define this specific model; these organizations do not endorse CalcPane or certify its outputs.

• Investor.gov — Compound interest calculator
• Investor.gov — How fees and expenses affect a portfolio

Formula implementation and worked examples checked by automated tests on 2026-10-17. Inspect this calculator’s inputs and expected outputs. Read our calculation methodology. Independent professional review has not been completed for this release.

Cite this calculator

CalcPane. (2026-10-17). Investment Expense Ratio Drag Calculator. https://calcpane.com/investment-fee-drag-comparison-calculator/

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