What is a mutual fund calculator?
A Mutual Fund Calculator estimates what a mutual fund investment could be worth after fees. Besides the starting amount, contributions, return and holding period, it accounts for front-end sales charges, deferred sales charges and yearly operating expenses, and shows your net return and net IRR. That makes it useful for comparing a low-cost fund with a more expensive one.
How to use it
- Enter your initial investment and any annual or monthly contribution.
- Enter the expected rate of return and the holding length.
- Enter the fund’s sales charge (load), any deferred sales charge and its yearly operating expenses (expense ratio), from the fund’s prospectus.
- Click Calculate to see the ending value, contributions, total fees, net return and net IRR.
Lump sum vs. regular investing
You can invest a single amount up front, add money regularly, or both. Regular investing spreads your purchases over time, so you buy more shares when prices are low and fewer when they are high. A lump sum has more time in the market, which tends to help when markets rise. The calculator handles both through the initial investment and contribution fields.
Mutual fund formula
FV = P × (1 + r)^n
where FV is the future value, P is the amount invested, r is the yearly return after expenses and n is the number of years. With regular contributions, each one grows from the year it is added: FV = P(1 + r)^n + C × [((1 + r)^n − 1) ÷ r].
Sales charges and expense ratios
A front-end sales charge is taken from your money before it is invested. An expense ratio is taken every year, which lowers your effective return. Over long periods the difference is large. For example, $10,000 growing at 7% a year for 20 years with a 0.1% expense ratio (6.9% net) reaches about $37,980; with a 1% expense ratio (6% net) it reaches about $32,071, roughly $5900 less.
Tips
- Check the expense ratio and any sales charges in the fund’s prospectus before you invest.
- Index funds often have much lower expenses than actively managed funds.
- Use a conservative return assumption; past performance does not guarantee future results.
- Hold funds in tax-advantaged accounts such as a 401(k) or IRA where possible.
Frequently Asked Questions
It depends on the return and how long you stay invested. Assuming a 7% yearly return after fees (not guaranteed), $10,000 grows to about $19,672 in 10 years and about $38,697 in 20 years.
Assuming a 7% yearly return (not guaranteed), $100,000 would grow to about $761,000 in 30 years. At 5% it would be about $432,000.
At an assumed 7% yearly return, $10,000 would be worth about $19,672 after 10 years. At 5% it would be about $16,289.
At an assumed 7% yearly return, $1,000 grows to about $1,967 in 10 years. Adding $100 a month over the same period would raise the total to roughly $19,000.
$3,000 a month is $36,000 a year. Using a 4% withdrawal rate as a rough guide, you would need about $900,000 invested ($36,000 ÷ 0.04). Taxes, fees and market swings can change that figure.
Disclaimer: This calculator gives estimates for general information only. It is not financial, tax or legal advice. Results depend on the numbers you enter and on simplified assumptions, so your actual figures may differ. Check important decisions with a qualified professional or the official source.
Related Calculators
To compare fund returns with other investments, try these calculators.