About the Mutual Fund Calculator
A mutual fund calculator projects returns from a lump sum, regular monthly investment, or both, and shows what the expense ratio costs you over the period. Fees are the one variable in investing you can control with certainty.
The formula
Net return = gross return − expense ratioThe expense ratio is an annual percentage of assets, deducted continuously. A 1 percent ratio on a 12 percent gross return leaves 11 percent net, applied to a compounding balance.
How to use this calculator
- 1Enter your Lump Sum Investment ($). The field starts at
10000, which you can overwrite. - 2Enter your Monthly SIP ($). The field starts at
500, which you can overwrite. - 3Enter your Expected Annual Return (%). The field starts at
12, which you can overwrite. - 4Enter your Expense Ratio (%). The field starts at
1, which you can overwrite. - 5Enter your Investment Period (Years). The field starts at
10, which you can overwrite. - 6Read the result straight away — it recalculates as you type, so there is no button to press. Use Share to copy a link that reopens the page with your exact numbers filled in.
Worked example
| Input | Value |
|---|---|
| Lump Sum Investment ($) | 10000 |
| Monthly SIP ($) | 500 |
| Expected Annual Return (%) | 12 |
| Expense Ratio (%) | 1 |
| Investment Period (Years) | 10 |
Result
Total Corpus: $139,385.14
Total Invested: $70,000.00
Wealth Gain: $69,385.14
Net Annual Return: 11.00% (after 1% expense ratio)
Those are the values the page loads with, so you can reproduce this result yourself and then change one field at a time to see what drives the outcome.
Understanding your result
Fees compound against you exactly as returns compound for you, which is why apparently small percentages matter so much. Over thirty years, a 1 percent expense ratio typically consumes 20 to 25 percent of the final balance compared with a 0.05 percent index fund — not 1 percent, but a quarter of the outcome.
This is the central argument for low-cost index funds. The evidence consistently shows that most actively managed funds underperform their benchmark after fees, and that past outperformance predicts future outperformance poorly. Fees, by contrast, are known in advance and entirely predictable.
Things worth knowing
- Index funds commonly charge 0.03 to 0.20 percent against 0.5 to 1.5 percent for active funds.
- Front-end and back-end loads are sales charges on top of the expense ratio. Avoid them.
- Systematic investment plans average your purchase price and remove timing decisions.
- High portfolio turnover generates taxable events in a non-sheltered account, adding cost beyond the expense ratio.
- Compare funds on net return after all fees, not on advertised gross performance.
Frequently asked questions
What is an expense ratio?+
The annual percentage of your assets deducted to cover fund management and operating costs. A 1 percent ratio on a 10,000 dollar holding costs 100 dollars a year, taken continuously rather than billed.
How much do fund fees really cost?+
Far more than they look. A 1 percent expense ratio over thirty years typically consumes 20 to 25 percent of the final balance relative to a low-cost index fund, because the fee compounds alongside your returns.
Are index funds better than actively managed funds?+
On average, yes, after fees. Most active funds underperform their benchmark over long periods, and identifying the exceptions in advance has proven very difficult. Low costs are the most reliable predictor of relative returns.
What is a SIP?+
A systematic investment plan — investing a fixed amount at regular intervals. It averages your purchase price across market conditions and removes the need to decide when to buy.