If you would like to compute the accelerated bi-weekly or weekly payment by yourself, you need to apply the following mortgage acceleration formula: P=A×i×(1+i)n∗12(1+i)n∗12−1×1w\\scriptsize
P = A \ imes i \ imes \\frac{(1+i)^{n*12}}{(1+i)^{n*12} - 1} \ imes \\frac{1}{w}P=A×i×(1+i)n∗12−1(1+i)n∗12​×w1​ where:
PPP - Biweekly payment;
AAA - Mortgage amount;
iii - The periodic interest rate (annual interest rate / 12)
nnn - The number of years
www - The payment frequency: weekly (w = 4) or bi-weekly (w = 2).