# Compound Interest Calculation Online

Calculates the compound interest or principal amount or interest rate on basis of selected values.

Find compound interest for annual, half yearly or quarterly compound interest. Compound interest is a concept of adding accumulated interest back to principal amount. The act of declaring interest to be principal is called compounding and

### Formula for Compound Interest is :

**A = P(1 + r/n) ^{nt} **

**Where: A = Total Amount (principal + interest), **

P = Principal Amount

I = Interest Amount

R = Annual Nominal Interest Rate in percent

r = Annual Nominal Interest Rate as a decimal = R/100

t = Time Involved in years, 0.5 years is calculated as 6 months, etc.

n = number of compounding periods per unit t; at the end of each period