Home Online Calculator Finance Equivalent Annuity Online Calculator Equivalent Annuity Calculator r: NPV: n: C =   ** Note: This calculator does the math for the percentage in variable r, so there is no need to put it in decimal form (i.e. if it is 8%, enter an 8). Additionally, the calculator converts variable n to negative, so enter it as a positive value. Previous Article NPV Calculator Next Article Simple Interest Calculator