Calculate Regular Payment Based on Rate, Number of Payment and PV Aug 10th, 2012 Calculate regular payment based on rate, number of payment and PV 1 2 def pmt(i, n, p): return i * p * pow((1 + i), n) / (1 - pow((1 + i), n)) Example: 1 2 >>> pmt(0.06, 120, 120000) -7206.622591189367