🚗 Vehicle Security Check
🌱 Compound Interest Calculator
Watch your money grow over time!
💰 Capture Data
How much money you start with
How much your money grows each year
How many years to grow your money
How often interest is added
Extra money you add each month
📊 Your Results
Final Amount
R0
Total Interest Earned
R0
Total Deposits
R0
Growth Multiplier
0x
🧮 Mathematical Formulas
Compound Interest Formula
A = P(1 + r/n)^(nt)
A = Final amount
P = Principal (starting amount)
r = Annual interest rate (decimal)
n = Compound frequency per year
t = Time in years
P = Principal (starting amount)
r = Annual interest rate (decimal)
n = Compound frequency per year
t = Time in years
With Regular Deposits
A = P(1 + r/n)^(nt) + PMT × [((1 + r/n)^(nt) - 1) / (r/n)]
PMT = Regular payment amount
Second part = Future value of annuity
Second part = Future value of annuity
Rule of 72
Years to Double = 72 ÷ Interest Rate
Quick way to estimate doubling time
At 8%: 9.0 years to double!
At 8%: 9.0 years to double!
Current Example
P = R10,000
r = 8% = 0.080
n = 12 (monthly)
t = 10 years
r = 8% = 0.080
n = 12 (monthly)
t = 10 years
📈 Growth Over Time
Your Deposits
Interest Earned
🎯 Fun Facts
Daily Taxi Fare Comparison
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Yearly Growth
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Compound Power
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Time Value
Starting earlier is powerful - each year matters!