Mutual Fund Calculator
Project mutual fund growth after fees, calculate SIP returns over time, or compare how different expense ratios erode your wealth. See the true cost of fund fees over decades. Works with any currency.
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How to Use This Calculator
Tab "Growth Projection"
Enter your initial investment, monthly contribution, expected annual return, expense ratio, and investment period. The calculator shows your projected balance after deducting the expense ratio from your gross return, the total amount invested, net growth, and fees lost to the expense ratio over time.
Tab "SIP (Systematic Investment)"
Enter your monthly SIP amount, expected return, expense ratio, and time horizon. See your total invested amount, projected balance after fees, growth earned, and total fees paid over the investment period. SIP assumes no lump-sum initial investment — just consistent monthly investing.
Tab "Fee Impact"
This is the most powerful tab. Enter your monthly SIP, gross return, and investment period. The calculator compares the same investment across four expense ratios: 0.05% (index fund), 0.50%, 1.00%, and 1.50%. See exactly how much wealth each fee level erodes over time and the total dollar difference between the cheapest and most expensive fund.
The Formulas
Net Return = Gross Return − Expense Ratio
Future value (monthly compounding):
FV = PV × (1 + r)n + PMT × [(1 + r)n − 1] / r
where r = net annual return / 12, n = years × 12
Fee impact:
Fees Lost = FV at Gross Return − FV at Net Return
Front-end load (if applicable):
Effective Investment = Amount × (1 − Load%)
All calculations use monthly compounding. Returns are pre-tax estimates. The expense ratio is deducted from the gross return before compounding, which accurately models how fund fees reduce your effective rate of return.
Worked Examples
Example 1 — $10,000 + $500/mo at 8% return, 0.50% expense ratio, 25 years
An investor starts with $10,000 and contributes $500 per month to a mutual fund with an 8% gross return and 0.50% expense ratio.
Even a seemingly modest 0.50% expense ratio costs over $51,000 in lost growth over 25 years. The fee does not come out of your pocket directly — it silently reduces your compounding rate.
Example 2 — $1,000/mo SIP at 10% return, 1.00% ER, 30 years
A systematic investor puts $1,000 per month into an actively managed fund with 10% gross return and 1.00% expense ratio.
A 1% expense ratio costs nearly $450,000 over 30 years on a $1,000/month SIP. That is more than the total amount invested ($360,000). Fees compound just like returns.
Example 3 — Fee comparison: $1,000/mo SIP at 8% gross, 30 years
The same $1,000/month invested over 30 years at 8% gross return, but across four different expense ratio levels:
Choosing a high-cost fund over an index fund costs nearly $368,000 on the same investment. That is not a rounding error — it is a house. The fee difference compounds relentlessly over decades.
Understanding Mutual Fund Fees
What Is an Expense Ratio?
The expense ratio is the annual percentage of your invested assets that a mutual fund charges for management, administration, and operating costs. A 1% ER means you pay $10 per year for every $1,000 invested. The fee is deducted from the fund's returns — you never see a separate bill, which makes it easy to ignore. But over decades, even small differences in expense ratios translate to enormous differences in wealth.
Index Funds vs Actively Managed Funds
Index funds track a market index (like the S&P 500) with minimal management, charging 0.03-0.10% ER. Actively managed funds employ portfolio managers to pick stocks, charging 0.50-1.50% or more. Research consistently shows that most active funds fail to beat their benchmark index over long periods — and the higher fees guarantee worse results on average.
The Power of SIP (Systematic Investment Plan)
SIP is the practice of investing a fixed amount at regular intervals regardless of market conditions. It removes emotion from investing, creates discipline, and benefits from cost averaging — buying more units when prices are low. Combined with a low-cost index fund and a long time horizon, SIP is one of the most reliable wealth-building strategies.
Why Fees Matter More Than You Think
A 1% fee sounds small, but fees compound over time just like returns. The fee is charged on your total balance every year — including all prior growth. As your balance grows, the dollar amount of fees grows too. Over 30 years, a 1.45% fee difference (1.50% vs 0.05%) can cost 25-30% of your final portfolio value. This is the single most controllable factor in long-term investing.