Investor's Mental Math : CAGR, Lump sum compounding & More

Master CAGR estimation, and lump sum compounding — no calculator needed. Make smarter investment decision real time.

What you'll learn
Apply the Rule of 72 to find doubling time for any return rate in seconds
Run the Rule of 72 in reverse to find the return rate needed to meet a goal
Convert any cumulative return percentage into a CAGR using the 4-step method
Compare investments of different ages fairly using annual return rates
Project a lump sum investment forward across decades using the doubling chain
Calculate how much to invest today to reach any future wealth target
Apply the Rule of 72 to inflation to find purchasing power halving time
Identify implausible return claims and fraudulent schemes using mental math
Read the rate-and-time grid and develop intuition for compounding outcomes
Apply all three tools together on a single investor decision using a structured checklist

Requirements
Basic arithmetic (addition, division)
No financial background needed
No calculator or spreadsheet
Curiosity about how investments grow

Description
When a fund brochure says "450% returns since inception," most investors are impressed. But what does that number actually mean per year? The answer — approximately 9% — is something every investor should be able to calculate on the spot. This course gives you that ability.

The Compounding Code teaches three mental math frameworks that work together to help you evaluate any investment in under 30 seconds — without a spreadsheet, app, or calculator.

What you'll learn to do

→ Find the doubling time of any investment in 2 seconds using the Rule of 72

→ Convert any cumulative return to an annual rate in under 20 seconds using the 4-step CAGR method

→ Project any lump sum investment forward — and reverse the calculation to find how much you need today

→ Spot fraudulent investment schemes using a single division

→ Understand why a 6% return difference can produce a 5× wealth difference over 30 years

These methods have been taught to first-time SIP investors, CA aspirants, and portfolio managers. The course includes 11 videos, 130+ minutes of content, and dozens of worked examples and practice questions — all grounded in real Indian investment scenarios (mutual funds, FDs, property, indices).

No financial background required. No calculator required. Just a willingness to think before you invest.

Who this course is for
First-time and retail investors
CA and finance exam aspirants
SIP and mutual fund investors
Anyone who reads fund brochures