Free mutual fund calculator
Project mutual fund growth over time — enter initial investment, monthly contributions, expected return, and years, updated live, as you type.
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Hypothetical projection. Excludes taxes, inflation, and fees. Actual investment returns vary.
Results are estimates. Consult a professional.
How the mutual fund calculator works
A mutual fund calculator projects the long-term value of an investment that combines a lump-sum initial deposit with regular monthly contributions, after deducting the fund's annual expense ratio. The expense ratio is the single biggest controllable drag on returns — it reduces your effective annual return every year for as long as you hold the fund.
The calculator subtracts the expense ratio from the gross return to get the net return you actually receive, then applies the standard future-value formula. The difference between the gross and net projections is the cumulative fee cost — a figure that grows dramatically over multi-decade investment horizons.
Worked example: $5,000 + $300/mo at 8% gross, 0.75% ER, 25 years
Priya invests $5,000 today and adds $300 a month into an actively managed mutual fund with an 8% gross historical return and a 0.75% annual expense ratio. She plans to invest for 25 years. What does the fee cost her?
Fee drag by expense ratio: $5,000 initial + $200/mo at 8% gross
The table below shows the net future value and cumulative fee cost at four expense ratio levels. The 0% ER row represents an idealized no-cost benchmark; the 0.05% row approximates a typical broad-market index ETF.
| Expense ratio | 10 years | 20 years | 30 years |
|---|---|---|---|
| 0.00% (benchmark) | $46,892 | $143,952 | $366,604 |
| 0.05% (index fund) | $46,647 | $142,592 | $362,003 |
| 0.50% | $44,810 | $132,943 | $326,189 |
| 1.00% | $42,793 | $123,283 | $290,972 |
| 1.50% | $40,843 | $114,188 | $259,268 |
Net FV for $5,000 lump sum + $200/mo at 8% gross annual return. Source: SEC mutual fund cost calculator; Vanguard expense ratio research.
Tips for evaluating mutual fund costs
Most investors focus on past returns but overlook the one number that is guaranteed to reduce them: the expense ratio. These five principles help you keep more of what the market gives you.
- Minimise the expense ratio before everything else — past returns are not guaranteed; fees are. A fund that earns 8% and charges 1% is mathematically guaranteed to underperform an identical fund charging 0.05% by 0.95% every year.
- Check for load fees separately — expense ratios do not include front-end or back-end sales loads. A 5% front-end load on a $10,000 investment removes $500 from your principal on day one.
- Compare net return to the relevant index — if a fund charges 1% and outperforms its benchmark index by only 0.6%, you are still losing 0.4% per year versus just buying the index.
- Use this calculator to price the trade-off — run it once with the fund's real ER, then at 0.05% (index equivalent). The difference is the premium you pay for active management — decide if it is worth it.
- Reinvest dividends automatically — the compounding formula assumes all returns stay invested. Letting dividends sit in cash breaks the compounding chain and reduces your actual net return below the stated figure.
Accuracy and limitations
This calculator assumes a constant gross return and a constant expense ratio for the full investment period. Real mutual fund returns are variable and unpredictable; expense ratios can change when a fund's assets grow or shrink. The model does not account for capital-gains distributions, tax drag outside a retirement account, load fees, transaction costs, or the impact of irregular contributions. For retirement-account investing, tax-deferred growth means the effective fee drag is somewhat different from the taxable-account figures shown.
This calculator is for educational and planning purposes only and does not constitute investment or financial advice. Past performance of any mutual fund does not guarantee future results. Consult a licensed financial advisor or fee-only planner before making fund-selection decisions.
Mutual fund terms defined
About this mutual fund calculator
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