A SIP (Systematic Investment Plan) calculator is an online financial tool that estimates the future value of a mutual fund investment made through regular monthly SIP contributions — based on inputs of the monthly SIP amount, expected annual return rate, and investment tenure. It uses the Future Value of an Annuity formula: FV = P × [(1+r)^n – 1] ÷ r × (1+r), where P is the monthly SIP amount, r is the monthly return rate, and n is the number of months. The SIP calculator powerfully illustrates the compounding effect over time — a ₹10,000 monthly SIP at a 12% annual return over 20 years grows to approximately ₹99 lakh, despite total principal contributions of only ₹24 lakh. In India, SIP calculators have been instrumental in driving mutual fund adoption among retail investors — AMFI's 'Mutual Funds Sahi Hai' campaign prominently features SIP calculators to visually demonstrate long-term wealth creation potential. Many Indian AMC and brokerage websites, including Ventura, offer SIP calculators with step-up SIP functionality — showing how increasing the SIP amount annually by a fixed percentage (typically 10% to 15% in line with salary increments) dramatically accelerates corpus accumulation. For investors setting financial goals, the SIP calculator helps determine the required monthly investment amount needed to reach a specific target corpus within a defined timeline.