Sip Calculator
A Systematic Investment Plan turns a modest monthly habit into serious wealth: the same $500 every month, invested at a 12% expected annual return, grows to about $116,170 in ten years even though you only put in $60,000. This SIP calculator projects that growth with the standard future-value-of-annuity formula, and shows exactly how much of the final figure is your money and how much is compounding doing the heavy lifting.
Quick Answer
Investing $500 a month at an expected 12% annual return for 10 years grows to about $116,170. You put in $60,000 across 120 instalments; compounding contributes the other $56,170, which is 48.4% of the final value. Stretch the same habit to 20 years and the projection passes $499,000.
- Time beats timing. Doubling the horizon from 10 to 20 years more than quadruples the projected corpus at the same monthly amount.
- Compounding does half the work. In the 10-year example, $56,170 of the $116,170 total is growth, not contributions.
- The return you assume is a guess, not a promise. Equity SIP projections commonly use 10-12%; a 3-point miss changes the 20-year outcome by hundreds of thousands.
- Consistency is the mechanism. Rupee-cost averaging means down months buy more units automatically, which is the whole point of the plan.
How a SIP turns small deposits into a large corpus
A Systematic Investment Plan is simply a fixed amount invested at fixed intervals, usually monthly, into a mutual fund. Because the amount never changes, market falls automatically buy more fund units and rallies buy fewer, a mechanism called rupee-cost averaging (dollar-cost averaging in the US and UK). Over years, this averaging plus reinvested growth produces the compounding curve the calculator projects. ClearTax describes the same three inputs every SIP calculator needs: monthly amount, expected return, and tenure, in its SIP calculator guide.
The discipline angle matters as much as the math. Automating the debit removes the two emotions that destroy returns: fear in downturns and greed at peaks. Before sizing your monthly amount, check what you can actually sustain with our savings rate calculator; a SIP you abandon in year two beats nothing.
The SIP formula: future value of an annuity due
The calculator uses the future value of an annuity due: FV = P x [((1 + r)^n – 1) / r] x (1 + r), where P is the monthly investment, r is the monthly rate (annual rate divided by 12), and n is the total number of months. The trailing (1 + r) factor is what makes it an annuity due: each instalment is assumed invested at the start of the month, so it compounds for one extra period. The computation runs in four steps:
12% a year becomes 1% a month: r = 0.01.
10 years is n = 120 monthly instalments.
((1.01)^120 – 1) / 0.01 = 230.04: the growth multiplier.
$500 x 230.04 x 1.01 = $116,170 maturity value.
If the expected return is 0%, the formula collapses to P x n: you simply get back what you put in. That edge case is worth knowing because it is also a sanity check on any SIP tool.
What $500 a month becomes at different returns
Two variables dominate the outcome: the assumed return and the horizon. This table runs the same $500 monthly investment across realistic assumptions, all computed with the annuity-due formula above:
| Horizon | At 8% | At 10% | At 12% | At 15% |
|---|---|---|---|---|
| 10 years | $92,083 | $103,276 | $116,170 | $139,329 |
| 20 years | $296,474 | $382,848 | $499,574 | $757,977 |
| 30 years | $750,148 | $1,139,663 | $1,764,957 | $3,504,910 |
Two patterns jump out. First, time dominates: at 12%, twenty years gives 4.3x the ten-year figure on only 2x the contributions. Second, the return assumption is enormously leveraged over long horizons: at 30 years, 15% projects nearly double the 12% figure. That is why the assumed rate deserves more scrutiny than any other input; anchoring it in historical market returns (the S&P 500 has compounded around 10% a year for decades with dividends reinvested) keeps projections honest. When the corpus is built, the next question is what it earns in retirement, which our investment distribution calculator models.
SIP versus lump sum: when each wins
$116,170 at 12% over 10 years. Strengths: no market-timing needed, automatic averaging in falls, affordable starting point, builds the savings habit.
Weaknesses: money enters gradually, so less time compounding than a lump sum in a steadily rising market.
$186,351 at 12% over 10 years. Strengths: every dollar compounds for the full decade; mathematically superior whenever returns stay positive.
Weaknesses: requires the full amount upfront and perfect timing courage; a crash right after investing hurts far more.
The honest summary: lump sum wins the math in rising markets, SIP wins the behavior in real life. Most investors do not have $60,000 on day one and would not invest it all at once if they did. A useful middle path is the step-up SIP: raising the monthly amount 10% each year turns the same 10-year plan into roughly $168,716, because contributions grow alongside income. Whatever the route, judge the outcome with our ROI calculator once real numbers replace projections.
What SIP calculators usually get wrong
Most SIP calculators present the projection as a promise, with no warning that mutual fund returns are market-linked and volatile. Many default to aggressive 15% assumptions without showing how sensitive the outcome is; the table above shows a 15% assumption nearly doubles the 30-year figure versus 12%. Few explain the annuity-due timing assumption, so users cannot reconcile the result with a spreadsheet. Almost none mention taxes or inflation, both of which take a real bite over decades. And the weakest tools hide the invested-versus-gains split, which is the single most motivating number on the page. This calculator leads with that split and states the limitations up front.
Frequently Asked Questions
About $116,170 at a 12% expected annual return. You contribute $60,000 over 120 months; roughly $56,170 comes from compounding. At 10% the same plan projects $103,276, and at 15% it projects $139,329.
No. SIPs invest in market-linked mutual funds, so returns fluctuate and can be negative over short stretches. The projected figure is an illustration based on the rate you enter, not a promise. Longer horizons smooth the ride but never eliminate market risk.
Indian equity funds are often illustrated at 12%, and some calculators use up to 15%; US index investors typically assume 8-10% based on long-run S&P 500 history. Use a conservative figure for planning and treat anything above it as a bonus, never the base case.
Mathematically, a lump sum wins when markets rise, because all the money compounds from day one: $60,000 at 12% for 10 years becomes $186,351 versus $116,170 for the equivalent SIP. Behaviorally, SIPs win for most people because they remove timing decisions and work with money as it is earned.
A SIP whose monthly amount rises each year, typically 5-10%, in line with income growth. A $500 monthly SIP stepped up 10% yearly projects about $168,716 over 10 years at 12%, versus $116,170 without the step-up.
Each instalment is treated as a separate investment with its own holding period. In India, equity fund gains held over a year face long-term capital gains tax; in the US, fund distributions follow the standard capital-gains rules. Check your country’s current thresholds before redeeming.
The SIP calculator projects a future value from an assumed rate; XIRR works backwards from your actual cash flows to find the annualized return you truly earned. Use this calculator for planning, and XIRR (or your fund statement) for measuring what actually happened.
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References
- ClearTax. SIP Calculator. Accessed October 18, 2026.
- Chola Securities. SIP Calculator: Systematic Investment Plan Returns. Accessed October 18, 2026.
- CalculateFin. SIP Calculator: Calculate Systematic Investment Plan Returns. Accessed October 18, 2026.
- CalculatorDigital. SIP Calculator: Mutual Fund Returns. Accessed October 18, 2026.
- EasyUnitConverter. SIP Calculator: Systematic Investment Plan Returns. Accessed October 18, 2026.
- TheBestStockBroker. SIP Calculator: Estimate Your Mutual Fund SIP Returns. Accessed October 18, 2026.
- ChartRow. S&P 500 Performance: Last 12 Months, 5, 10, 20 and 30 Years. Accessed October 18, 2026.
- BiggerReward. S&P 500 Index: Nine Decades of Historical Market Performance. Accessed October 18, 2026.
- Eco3min. S&P 500 Historical Data Since 1871: Total Return Chart. Accessed October 18, 2026.
- Groww. Difference Between CAGR vs Absolute Return in Mutual Funds. Accessed October 18, 2026.