Published: 2026-06-17 · By Bhanuprakash Sardesai
12. Rupee Cost Averaging: The Secret to SIP Success
Rupee Cost Averaging (RCA) is the mechanism that makes SIP investing so powerful, especially in volatile markets. When you invest a fixed amount regularly, you automatically buy more units when prices are low and fewer units when prices are high. Over time, this reduces your average cost per unit compared to the average market price – a mathematical advantage that requires no market timing skill whatsoever.
Let's illustrate with a simple example. Suppose you invest ₹10,000 monthly in a mutual fund whose NAV fluctuates: Month 1: NAV ₹100 (buy 100 units), Month 2: NAV ₹80 (buy 125 units), Month 3: NAV ₹120 (buy 83.33 units), Month 4: NAV ₹100 (buy 100 units). Total investment: ₹40,000. Total units: 408.33. Average cost per unit: ₹40,000/408.33 = ₹97.96. Average NAV over the period: (100+80+120+100)/4 = ₹100. You bought at an average price lower than the average NAV – that's RCA at work!
RCA works best in volatile, long-term upward-trending markets – which perfectly describes equity markets. During market crashes, your fixed SIP amount buys significantly more units. When the market recovers, those extra units turbocharge your returns. You can instantly estimate your future returns using our free online SIP Calculator to see how consistent monthly investing builds wealth over time.
RCA has psychological benefits too. Knowing that market dips actually benefit your long-term SIP returns can help you stay calm during volatility. Use our SIP Calculator to model different market scenarios and see the power of RCA.
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