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How to Calculate Index Fund

See how an S&P 500 index fund grows your monthly investment, and how expense ratios eat into returns.

The Formula

expectedReturn - expenseRatio

The index fund formula uses the mathematical relationship: expectedReturn - expenseRatio. Each variable in the formula represents a measurable quantity that affects the final result.

Step-by-Step Method

  1. 1Identify all input values needed for the index fund calculation.
  2. 2Substitute your known values into the formula: expectedReturn - expenseRatio.
  3. 3Perform the arithmetic operations in the correct order (PEMDAS/BODMAS).
  4. 4Check that your result has the correct units and is within a reasonable range.
  5. 5Verify using the interactive Index Fund Calculator to confirm your answer.

Related Topics

index fundS&P 500expense ratioETFinvesting

Use the Interactive Calculator

Skip the manual math — get instant results with our free Index Fund calculator.

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