Compound Interest Calculator

About this Compound Interest Calculator

This free online compound interest calculator helps you estimate how your money can grow over time when interest is compounded. It shows the final amount, total interest earned, and a clear step-by-step breakdown of the calculation.

You can choose the principal amount, annual interest rate, time period, compounding frequency, and currency. The tool also keeps a local history of your recent calculations for quick reference.

Principal (P)

Annual Interest Rate (%) (r)

Time (Years) (t)

Compounding Frequency (n) Annually (n = 1) Semi-Annually (n = 2) Quarterly (n = 4) Monthly (n = 12) Daily (n = 365)

Currency USD – US Dollar EUR – Euro INR – Indian Rupee GBP – British Pound JPY – Japanese Yen CNY – Chinese Yuan AUD – Australian Dollar CAD – Canadian Dollar CHF – Swiss Franc SAR – Saudi Riyal

 

Calculation History

Your last 10 calculations are stored locally in this browser. Clearing site data will remove them.

Formulas Used in This Calculator

• Final Amount (A):
  A = P × (1 + r/n)^n×t
• Compound Interest (CI):
  CI = A − P
• Periodic Rate:
  i = r / n
• Total Number of Periods:
  N = n × t

Where: P = Principal, r = annual interest rate (as decimal), n = compounding frequency per year, t = time in years.

Calculator Attributes Explained

• Principal (P): The initial amount of money you invest or deposit.
• Annual Interest Rate (r): The yearly interest rate in percentage (e.g., 8%).
• Time (t): The duration for which the money is invested, in years.
• Compounding Frequency (n): How many times per year interest is added (e.g., monthly = 12).
• Currency: The currency symbol used for display (does not affect the math).

Frequently Asked Questions (FAQs)

What is compound interest?

Compound interest is interest calculated on the initial principal and also on the accumulated interest from previous periods. This “interest on interest” effect makes your investment grow faster than simple interest.

How is compound interest different from simple interest?

Simple interest is calculated only on the principal amount, while compound interest is calculated on the principal plus all previously earned interest. Over long periods, compound interest usually results in much higher returns.

What does compounding frequency mean?

Compounding frequency (n) is how often interest is added to your balance in a year. Common options are annually (1), semi-annually (2), quarterly (4), monthly (12), and daily (365). More frequent compounding leads to slightly higher returns.

Can I use this calculator for loans?

Yes, the same formula applies to loans where interest is compounded. However, real loans may include fees, varying rates, and different repayment structures, so treat this as an estimate.

Is my data stored anywhere?

This calculator stores your recent calculation history only in your browser’s local storage. No data is sent to any server. Clearing your browser data will remove this history.