SIP Calculator

A Systematic Investment Plan (SIP) is an investment vehicle offered by mutual funds that allows individuals to invest small, fixed amounts of money at regular intervals (typically monthly) into chosen equity or debt mutual fund schemes. Rather than attempting to time volatile market swings with a lump-sum commitment, an SIP harnesses two fundamental mathematical principles: Rupee Cost Averaging and Compounding Interest.

When stock markets experience downturns, your fixed monthly contribution automatically purchases a higher quantity of mutual fund units at lower Net Asset Values (NAV). Conversely, when markets rally, your contribution buys fewer units. Over extended market cycles of 5, 10, or 20 years, this smooths out market turbulence, systematically lowering the average cost per unit without requiring emotional guesswork or speculative day trading.

The future maturity corpus of an SIP is computed using the future value of an annuity formula: M = P × [ ((1 + i)^n - 1) ÷ i ] × (1 + i)

Where:

• M = Final maturity amount received at the end of the investment tenure
• P = Amount invested each month (Periodic Contribution)
• i = Periodic (monthly) interest rate, calculated as annual expected return divided by 12 (i.e., r ÷ (12 × 100))
• n = Total number of monthly installments over the tenure (Years × 12)

Because returns reinvest continuously, the curve is not linear—it is exponential. During the first 3 to 5 years, the total invested capital and total returns appear neck-and-neck. By years 10 to 15, the wealth gain from interest compounding begins to dwarf the principal invested.

A common pitfall in financial planning is running a "flat SIP" throughout one's working career. As annual salary and disposable income rise with promotions and bonuses, investors should utilize a Step-Up (or Top-Up) SIP—increasing contributions by 5% to 10% each year. A modest 10% annual step-up can often double the final wealth corpus over a 15-year horizon.

Additionally, smart investors account for inflation. If a portfolio generates 12% nominal CAGR and average consumer price inflation runs at 6%, the real purchasing power expansion is approximately 5.66% (((1+0.12)/(1+0.06)) - 1). Factoring in inflation guarantees that a ₹1 Crore corpus in 2040 corresponds to realistic living expenses.