📈Finance Guide

Power of Compound Interest

Why Einstein called it the 8th wonder of the world — visual guide

SmartCalc · smart-calculator.in
Investment Calc →
2 / 9
Simple vs Compound

Two Types of Interest

Simple Interest — linearSI = P x R x T ÷ 100
Rs 1L at 10% for 10yr = Rs 1L earned
Compound Interest — exponential!A = P x (1 + r/n)^(nxt)
Rs 1L at 10% monthly 10yr = Rs 1.71L earned
Real numbers →
Calculator
3 / 9
Real Numbers

Rs 1 Lakh — Simple vs Compound

Rs 1LSimple Interest
Rs 1.71LCompound Monthly
Same amount, same rate, same time
Simple: Rs 1,00,000 earned
Monthly compound: Rs 1,70,704 earned
Difference: Rs 70,704 extra!
Rule of 72 →
Calculate
4 / 9
Rule of 72

How Long to Double Money?

Divide 72 by your interest rate to find years to double money.

6% rate72 ÷ 6 = 12 years
9% rate72 ÷ 9 = 8 years
12% rate72 ÷ 12 = 6 years
18% rate72 ÷ 18 = 4 years
SIP power →
Try Calc
5 / 9
SIP Power

Rs 5,000 Per Month at 12%

Rs 11.6L10 Years
Rs 49.9L20 Years
Rs 1.76Cr30 Years

Total invested in 30 years: Rs 18 lakh. Returns: Rs 1.58 Crore!

Start early →
My SIP
6 / 9
Start Early

Time is Your Biggest Asset

Investor A — starts at age 25
Rs 5,000/mo for 10 years, then stops
Total invested: Rs 6 lakh
Wealth at 60: Rs 3.5 Crore
Investor B — starts at age 35
Rs 5,000/mo for 25 years
Total invested: Rs 15 lakh (2.5x more)
Wealth at 60: Rs 2.1 Crore only
Compounding frequency →
Calculate
7 / 9
Frequency Matters

Rs 1 Lakh at 12% for 10 Years

AnnualRs 3,10,585
QuarterlyRs 3,26,204
MonthlyRs 3,30,039
DailyRs 3,31,946
Key rules →
Try Now
8 / 9
3 Golden Rules

Rules of Compounding

Start as early as possible — time is your biggest advantage
🔄Stay consistent — invest every month without fail
🚫Never withdraw early — biggest gains come in the final years
Calculate your wealth →
Open Tool
9 / 9
Free Tool

Calculate Investment Returns

Lump sum and SIP calculator. See your wealth at any future date.

Free · Instant · No signup
📈 Open Investment Calculator →