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Compound Interest Calculator

Calculate compound interest with flexible compounding periods — monthly, quarterly, half-yearly or annually.

Investment Details

About This Calculator

Compound interest is interest calculated on both the initial principal and the accumulated interest from previous periods. Albert Einstein reportedly called it the eighth wonder of the world. This calculator shows the powerful difference between simple and compound growth over time.

How to Use This Calculator

  1. 1Enter your principal or investment amount
  2. 2Enter the annual interest rate
  3. 3Enter the investment duration in years
  4. 4Choose compounding frequency (monthly gives the best results)
  5. 5Click Calculate to see total amount and interest earned

Formula Used

A = P × (1 + r/n)^(n×t)

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FAQ

Frequently Asked Questions

Common questions about the compound interest calculator answered.

What is the difference between compound and simple interest?+
Simple interest is calculated only on the principal amount. Compound interest is calculated on the principal plus all previously accumulated interest. Over long periods, compound interest grows exponentially while simple interest grows linearly. For example, 10,000 at 8 percent simple interest for 20 years gives 26,000. Compound interest monthly gives 49,268.
How does compounding frequency affect returns?+
More frequent compounding gives slightly higher returns. Monthly compounding gives more than quarterly, which gives more than annual. The difference is most significant at higher interest rates and longer durations. Daily compounding gives marginally more than monthly in most practical cases.
What does APY mean versus APR?+
APR (Annual Percentage Rate) is the stated interest rate. APY (Annual Percentage Yield) accounts for compounding and is always higher than APR when compounding occurs more than once a year. Banks use APY to show savings account returns and APR for loan costs.
How can I use this for loan calculations?+
For loans, compound interest works against you as the borrower. The same formula applies. A 10,000 loan at 18 percent APR compounded monthly for 3 years means you will repay approximately 16,189 in total. Use our EMI calculator for monthly payment breakdowns.

The Power of Compound Interest

Starting with $10,000 at 8% annual interest, compounding monthly for 30 years gives $109,357. The same investment with simple interest gives only $34,000. The difference of $75,357 is entirely due to compound growth. This is why investing early and letting money compound over decades is the foundation of long-term wealth creation.

  • Invest early to maximize compounding years
  • Reinvest all dividends and returns
  • Higher compounding frequency increases final returns slightly
  • Avoid withdrawals to maintain full compounding effect

Compound Interest vs FD vs SIP

Fixed deposits offer guaranteed compound interest at a fixed rate, typically 5 to 7 percent annually. SIP mutual funds aim for 10 to 15 percent CAGR through equity markets but carry market risk. This compound interest calculator works for all three scenarios. Simply enter the rate and time period to compare projected outcomes.

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