Compound Interest Calculator

Calculate compound interest on an investment or savings. Includes compound interest formulas to find principal, interest rates or final investment value.

Periods (n)
Rate % (R)
Principal (P)
Total (A)

Compounding Interest Formula

A = P(1 + r/n)nt


  • A = accrued amount (principal plus interest)
  • P = principal amount
  • R = annual nominal interest rate in percent
  • r = annual nominal interest rate in decimal
  • t = time in years
  • n = number of compounding periods per year