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Monthly Investment Calculator

Calculate the future value of your Systematic Investment Plan. See how small monthly investments grow into significant wealth over time.

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📈 Annual Step-Up SIP (optional)

Increase your monthly investment each year to boost returns.

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Your SIP Results

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Year-by-Year Growth

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What Is a Systematic Investment Plan (SIP)?

Also searched as: sip calculator | recurring investment calculator | monthly investment return calculator | mutual fund return calculator Optimized for US users with American units and terminology.

A Systematic Investment Plan, or SIP, is a disciplined investment approach where you invest a fixed amount at regular intervals — typically monthly — into a mutual fund, index fund, or other investment vehicle. Rather than trying to time the market with a large one-time investment, SIP spreads your investment over time, using dollar-cost averaging to reduce the impact of market volatility.

SIP is one of the most popular investment methods globally because it's accessible, flexible, and removes the need to predict market movements. You invest consistently regardless of whether markets are up or down, automatically buying more units when prices are low and fewer when prices are high.

How SIP Returns Are Calculated

SIP returns are calculated using the future value of an annuity formula: FV = P × ((1 + r)^n - 1) / r × (1 + r), where FV is the future value (maturity amount), P is the monthly investment, r is the monthly rate of return (annual rate ÷ 12), and n is the total number of monthly payments. This calculator also supports Step-Up SIP, where your monthly contribution increases by a fixed percentage each year.

The Power of Starting Early

Time is the most powerful factor in SIP investing. Investing $500 per month at 12% annual return for 20 years produces a dramatically larger corpus than investing $1,000 per month for 10 years — even though the total amount invested in the second scenario is the same. Starting 5 years earlier can more than double your final corpus at the same rate, thanks to the compounding of returns over additional years.

What Is Step-Up SIP?

A Step-Up SIP (also called Top-Up SIP) allows you to increase your monthly investment amount by a fixed percentage each year — typically aligned with your annual salary increase. For example, starting at $500/month with a 10% annual step-up means you invest $550 in year 2, $605 in year 3, and so on. This significantly boosts your final corpus without requiring a large initial commitment. Use the step-up field in this calculator to see the dramatic difference it makes.

Frequently Asked Questions

Use the Monthly Investment Calculator above — enter your values and get instant results. This free online tool calculates how much should i invest monthly without any download or signup required. Results update in real time as you type.
Use the Monthly Investment Calculator above — enter your values and get instant results. This free online tool calculates investment calculator with monthly contributions without any download or signup required. Results update in real time as you type.
For US broad market index funds (like S&P 500 index funds), the historical average annual return is approximately 10–12% before inflation. A conservative, inflation-adjusted assumption of 7–8% is commonly used for long-term planning. Past returns don't guarantee future results.
Yes. With most investment platforms and mutual funds, you can increase, decrease, pause, or stop your SIP at any time. Flexibility is one of SIP's biggest advantages over fixed deposit or lump sum commitments.
Yes, SIP is essentially dollar-cost averaging applied to mutual fund investing. By investing a fixed amount regularly, you automatically buy more units when the price is low and fewer when it's high, reducing your average cost per unit over time.
Many investment platforms allow SIPs starting at $25 to $50 per month. Apps like Acorns, Betterment, and Fidelity let you start with very small amounts. There is no maximum limit — you can invest as much as you want each month.
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SIP Quick Facts
💡 $500/month at 12% for 20 years = over $494,000. Total invested: $120,000.
💡 A 10% annual step-up on that same SIP grows it to over $1.1 million.
💡 Starting 5 years earlier nearly doubles your final corpus at the same rate.
Quick Tips
💡 Step-up SIP (increasing contributions 10%/year) can nearly double your corpus vs a flat SIP.
💡 Starting a SIP at 25 vs 35 can result in 3× more wealth by retirement — time beats amount.
💡 Index fund SIPs averaging 12%/year historically outperform most actively managed funds over 10+ years.