Assuming a 12% annual return, you would need to invest approximately ₹20,017 per month in a Systematic Investment Plan (SIP) to reach ₹1 Crore in 15 years.

A Reverse SIP Calculator (or Target Amount SIP Planner) allows you to enter your final financial goal (e.g., ₹50 Lakhs) and calculates the exact monthly investment required to reach that target over a specific time period.

Historically, Indian equity mutual funds (like Nifty 50 index funds) have delivered 12-14% annualized returns over 15+ year horizons. However, market returns are not guaranteed, so it's wise to use conservative estimates like 10-12%.