How much will your SIP actually grow? Run the numbers before you invest

SIPs (Systematic Investment Plans) have become the default way Indians invest in equity mutual funds — and for good reason: you invest a fixed amount every month, you don't have to time market highs or lows, and small disciplined contributions compound into substantial wealth. But most people start a SIP without ever projecting where it actually leads. Knowing the likely outcome is what keeps you invested when the market dips — so let's run the numbers properly.

Two powerful mathematical forces do the heavy lifting in a Systematic Investment Plan: 1. Rupee Cost Averaging: When equity markets fall, your fixed monthly instalment buys more mutual fund units at lower NAVs (Net Asset Values). When markets rise, you buy fewer units at higher NAVs. Over a 5-to-10 year horizon, this automatically lowers your average cost per unit without requiring any active market timing. 2. Exponential Compounding: Each monthly instalment earns returns, and those returns generate their own returns over subsequent quarters. The mathematical formula for SIP future value is: M = P × [((1 + i)^n - 1) / i] × (1 + i), where P is monthly deposit, i is monthly return rate, and n is total months.

Consider an investor who commits to a ₹5,000 monthly SIP with an expected 12% annualized return: • After 5 Years: Total Invested = ₹3,00,000 | Estimated Value = ₹4,12,432 (Gains: ₹1.12L) • After 10 Years: Total Invested = ₹6,00,000 | Estimated Value = ₹11,61,695 (Gains: ₹5.61L) • After 15 Years: Total Invested = ₹9,00,000 | Estimated Value = ₹25,22,880 (Gains: ₹16.22L) • After 20 Years: Total Invested = ₹12,00,000 | Estimated Value = ₹49,95,740 (Gains: ₹37.95L) Notice how the growth in the final 5 years (₹24.7L addition) is more than double the entire portfolio value built during the first 10 years combined. That is why time in the market consistently beats timing the market.

As your career progresses and your salary grows, your monthly SIP should grow too. A Step-Up SIP (increasing your monthly contribution by just 10% each year) dramatically alters your final wealth outcome. A ₹5,000 base SIP with a 10% annual step-up over 20 years yields roughly ₹98 Lakhs instead of ₹50 Lakhs — doubling your retirement corpus while requiring only modest annual savings adjustments.

Plug in your monthly amount, the number of years and an expected return rate, and a SIP calculator will show your projected final corpus, how much you actually invested, and how much is pure growth. Rupix's free SIP calculator at tools.rupix.io/sip-calculator does this instantly in your browser — try a few different monthly amounts and tenures to see how much sooner-and-steadier beats later-and-bigger.

A projection only comes true if you keep funding the SIP every month, in good markets and bad. The people who win are the ones who treat the SIP like a non-negotiable bill and never skip it — so before you start, pick an amount you can sustain for years, not just this month. Use tools.rupix.io/sip-calculator to test a monthly figure you're confident you can keep up, and let the compounding do the rest over time.