# Interest and APR Calculators

Calculate simple and compound interest with online interest and APR calculators. See how varying number of periods and compounding frequency affects nominal interest rate, effective interest rate, periodic and equivalent interest rate calculations.

Simple Interest Plus Principal Calculator

A = P(1 + rt) (Principal + Interest)

I = Prt (Interest Only)

A = P(1 + r)^{t} * and * A = P(1 + r/n)^{nt}
* and *A = Pe^{rt}

Periodic Compound Interest Calculator

Excel Function Method for A = P(1 + r)^{t}

**APR**: Annual Percentage Rate Calculator

**APR**: Annual Percentage Rate Calculator, Basic

Effective Annual Rate (EAR) Calculator

Effective Interest Rate Calculator

Nominal Interest Rate Calculator

Periodic Interest Rate Calculator