The following formula is involved in the calculation of accounts payable to average daily purchases ratios:

Accounts payable to average daily purchases ratio:
where AP is the accounts payable balance and P is the total amount of purchases.

The following references can be used to cite this accounts payable to average daily purchases calculator:
 Soper, D.S. (2017) "Accounts Payable to Average Daily Purchases Calculator (Online Software)", http://www.danielsoper.com/fincalc. 
 Siegel, J. and Shim, J. (1997). "Schaum's Quick Guide to Business Formulas", New York, NY: McGrawHill. 