Compound Interest Calculator

Dynamic Compound Interest Calculator.
Calculating C.I. when interest is compounded Annually, Half-yearly, Quarterly.
You can also calculate Principal, Rate of Interest or Time from other values.

Compound Interest Calculation Online

Select what you want to calculate then enter the values in the respective rows and click find.
Say if you want to calculate C.I. enter the values for P,R and n.

I want to calculate
Interest Compounded
Principal or Sum [P] =
Rate % per Annum [R] %
Time Years [n]
Compound Interest [C.I.]



Total Amount = Principal + CI (Compound Interest)

a. Formula for Interest Compounded Annually
         Total Amount = P(1+(R/100))n

b. Formula for Interest Compounded Half Yearly
         Total Amount = P(1+(R/200))2n

c. Formulae for Interest Compounded Quarterly
         Total Amount = P(1+(R/400))4n

d. Formulae for Interest Compounded Annually with fractional years (e.g 2.5 years)
         Total Amount = P(1+(R/100))a×(1+(bR/100))
         here if year is 2.5 then a =2 and b=0.5

e. With different interest rates for different years
Say x% for year 1, y% for year2, z% for year3
         Total Amount = P(1+(x/100))*(1+(y/100))*(1+(z/100))

where CI = Compound Interest, P = Principal or Sum of amount, R = % Rate per annum, n = Time Span in years