SIP Investment Calculator in JavaScript
Build a systematic investment plan calculator in JavaScript with CAGR projections and wealth charts.
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Tags: SIP calculator JavaScript, JavaScript investment calculator, mutual fund return calculator JS
SIP Investment Calculator in JavaScript A SIP calculator is one of the most impactful financial tools you can build — it shows users the long-term power of consistent investing. This guide implements the core SIP formula, year-by-year projections, step-up SIP, and a Chart.js visualisation in JavaScript. The SIP (Systematic Investment Plan) framework in India is regulated by SEBI (Securities and Exchange Board of India), and the mathematical formula follows the annuity due formula standard in financial mathematics. --- What is the SIP formula? A SIP is mathematically the future value of an annuity (a series of equal periodic payments): Where: P = monthly investment amount r = monthly return rate = annual rate / 12 / 100 n = total number of months = years × 12 The trailing treats it as an…
Frequently Asked Questions
How do I calculate SIP returns in JavaScript?
Use the future value of an ordinary annuity formula: FV = P × [((1 + r)^n − 1) / r] × (1 + r), where P is the monthly investment, r is the monthly return rate (annual rate / 12 / 100), and n is the total number of months. Multiply n by 12 if you input years. This gives the final corpus assuming consistent monthly investments and a fixed return rate.
What is the formula for SIP future value?
SIP FV = P × [((1 + r)^n − 1) / r] × (1 + r). The (1 + r) factor at the end is because SIP investments are made at the beginning of each period (annuity due). If your calculator assumes end-of-period payments (ordinary annuity), drop the trailing (1 + r). Most financial calculators and spreadsheets use the annuity due convention for SIPs.
How do I generate a year-by-year SIP projection?
Loop from year 1 to the target horizon. For each year, calculate sipFV with n = year × 12 months. Store the invested amount (monthly × year × 12) and future value at each year. Return an array of objects with { year, invested, futureValue, gains } for charting or table display.
How do I visualize SIP returns in Chart.js?
Install Chart.js or include it via CDN. Create a bar chart dataset with two datasets: 'Total Invested' (base) and 'Gains' (stacked on top). Use the year-by-year projection array to populate labels and data. Set chart type to 'bar' with stacked: true. This creates a classic SIP growth chart showing how gains outpace invested amount over time.
Can I calculate SIP step-up in JavaScript?
Yes. A step-up SIP increases the monthly investment by a fixed percentage each year. Use a nested loop: outer loop over years, inner loop over 12 months. Multiply balance by (1 + monthlyRate) and add the current monthly investment each month. After each full year, increase the monthly investment by the step-up percentage. This cannot be solved with a closed-form formula — the loop is necessary.
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