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Calculate compound interest for SIP, fixed deposits, savings, retirement. Supports 9+ countries with daily, monthly, quarterly, annual compounding.
Based on current Federal Reserve rates and market averages
Select your country from 9+ options with real interest rates
Enter your principal (initial investment amount)
Set the time period (how long you plan to invest)
Choose compounding frequency (daily, monthly, quarterly, annual)
View detailed breakdown with yearly analysis and total interest earned
Retirement Planning: Project long-term savings growth for retirement goals
SIP Calculations: Calculate Systematic Investment Plan returns
Savings Accounts: Estimate growth in high-yield savings accounts
Fixed Deposits: Compare FD returns across different banks
Investment Analysis: Evaluate potential returns on investment portfolios
Education Planning: Plan for future education expenses with compound growth
Wealth Building: Understand how time and compounding build wealth
Compound interest is interest calculated on both the initial principal and all accumulated interest from previous periods. Unlike simple interest that only earns on the principal, compound interest creates exponential growth as you earn "interest on interest." Albert Einstein allegedly called it the "eighth wonder of the world."
A = P(1 + r/n)^(nt)
Where: A = Final amount, P = Principal (initial investment), r = Annual interest rate (decimal), n = Compounding frequency per year, t = Time in years
The Rule of 72 is a quick mental shortcut to estimate how long it takes for your money to double. Simply divide 72 by your annual interest rate percentage:
Years to Double = 72 ÷ Interest Rate
Example: At 8% interest, 72 ÷ 8 = 9 years to double your money
Example: At 6% interest, 72 ÷ 6 = 12 years to double your money
Simple Interest: Calculated only on the principal. $10,000 at 5% earns $500 every year, forever the same amount.
Compound Interest: Calculated on principal + accumulated interest. $10,000 at 5% earns $500 year 1, $525 year 2, $551.25 year 3, and continues accelerating. After 30 years: simple interest = $25,000 total, compound interest = $43,219 total.
Start investing early to maximize the power of compound interest. Even small amounts grow significantly over time. A 22-year-old investing $100/month at 7% will have more at 65 than a 32-year-old investing $200/month at the same rate - the 10-year head start makes that much difference!