SIP Calculator

What is a SIP calculator?

A SIP calculator estimates how much a monthly Systematic Investment Plan will grow to — showing your total invested, the returns earned, and the final maturity value — based on a fixed monthly contribution, an expected annual return rate and the number of years. A SIP simply means investing a set amount on a regular schedule (usually monthly) into a mutual fund or similar instrument, rather than all at once.

This tool is part of our finance calculators collection. It is a planning estimate: the returns it shows are projections, not promises.

How is SIP maturity calculated?

It compounds every monthly instalment to the end of the term using the future value of an annuity due (each payment made at the start of the month):

FV = P × ((1 + i)ⁿ − 1) ÷ i × (1 + i)

Where:

• P = monthly investment amount
• i = monthly return rate = annual rate ÷ 12 ÷ 100
• n = number of months = years × 12
• FV = maturity value (the final corpus)

From there the tool derives the two figures investors care about most:

• Invested amount = P × n
• Estimated returns = FV − Invested amount

The trailing × (1 + i) is what makes this an annuity due: because each SIP is invested at the beginning of the month, every instalment earns one extra month of growth compared with an ordinary (end-of-month) annuity. If the return rate is 0%, the formula collapses to P × n — you simply get back what you put in.

Worked examples you can reproduce

Example 1 — 5,000 per month, 12% per year, 10 years. First find the monthly rate and number of months: i = 12 ÷ 12 ÷ 100 = 0.01 and n = 10 × 12 = 120. Then:

FV = 5000 × ((1.01¹²⁰ − 1) ÷ 0.01) × 1.01 ≈ 1,161,695

• Invested amount = 5000 × 120 = 600,000
• Estimated returns = 1,161,695 − 600,000 = 561,695
• Maturity value ≈ 1,161,695

So you contribute 600,000 of your own money and the projected returns add another 561,695 — nearly doubling the invested amount.

Example 2 — 10,000 per month, 12% per year, 15 years. Here i = 0.01 and n = 180:

FV = 10000 × ((1.01¹⁸⁰ − 1) ÷ 0.01) × 1.01 ≈ 5,045,760

• Invested amount = 10000 × 180 = 1,800,000
• Estimated returns = 5,045,760 − 1,800,000 = 3,245,760
• Maturity value ≈ 5,045,760

Notice that stretching the horizon from 10 to 15 years lets the returns component (3,245,760) grow larger than the amount actually invested (1,800,000) — that is compounding doing the heavy lifting.

How does a SIP grow over time?

The longer the money stays invested, the more disproportionately the returns grow versus your contributions. The table below shows a fixed 5,000 monthly SIP at 12% per year, matching this calculator’s output:

Years	Invested amount	Estimated returns	Maturity value
5	300,000	112,432	412,432
10	600,000	561,695	1,161,695
15	900,000	1,622,880	2,522,880
20	1,200,000	3,795,740	4,995,740
25	1,500,000	7,988,175	9,488,175

At 5 years, returns are a fraction of what you invested; by 25 years they are more than five times your contributions. That widening gap is the core argument for starting early and staying invested.

SIP vs lump sum: which is better?

Neither is universally better — it depends on cash flow and market timing. A lump sum puts the whole amount to work immediately, so in a steadily rising market it compounds from day one and usually ends up ahead. A SIP spreads buying across many months, so you purchase more units when prices are low and fewer when high (rupee/dollar-cost averaging), which smooths out volatility and removes the pressure of timing the market.

Factor	SIP (monthly)	Lump sum
Cash needed upfront	Small, recurring	Large, one-time
Timing risk	Low (averaged)	High (single entry point)
Best market for it	Volatile or falling-then-rising	Steadily rising
Discipline / habit	Builds automatic saving	One decision
Compounding window	Each instalment differs	Full amount from day one

For a one-time amount you can also compare growth with a dividend calculator or model a single deposit’s future value separately; for goal planning over many years, the recurring SIP approach above is usually the more realistic match for a salary.

Tips and common mistakes

• Don’t treat the return rate as fixed. Markets swing year to year; the 12% figure is a long-run average, not an annual guarantee. Re-run the tool at 8% and 10% to see a realistic range.
• Match the rate to the asset. Equity funds may justify 10–12%, but pure debt or hybrid funds are closer to 6–8%. Plugging an equity rate into a debt SIP overstates the corpus.
• Remember it is pre-tax and pre-fee. Expense ratios, exit loads and capital-gains tax all reduce the in-hand amount.
• Inflation erodes the headline number. A maturity value 20 years out buys less than the same number today — discount it mentally.
• Use consistent units. Monthly amount in, monthly rate derived automatically; entering an annual contribution by mistake will inflate the result twelvefold.

Limitations and accuracy notes

This calculator assumes a constant monthly amount, a constant return rate, and start-of-month investing (annuity due). Real SIPs experience variable returns, occasional missed instalments, step-ups, dividends reinvested at different prices, and fees — none of which are modelled here. Figures are rounded to whole units for display, so a small rounding difference from a manual calculation is normal.

Disclaimer: This SIP calculator is for educational and illustrative purposes only and does not constitute financial advice. Mutual fund and market-linked investments are subject to market risk; returns are not guaranteed and you may get back less than you invested. Consult a qualified financial adviser before making investment decisions.

For other money planning, explore the loan calculator for borrowings or the pay raise calculator to see how a higher income could lift the monthly amount you can afford to invest.