Accounts receivable turnover. Print Select the formula and then enter the amounts to calculate accounts receivable turnover.Formula: Net Accounts Receivable = Gross Accounts Receivable – Allowances for Doubtful Debts. Variables Involved in the Formula:some text. To calculate net accounts receivable, you need: total accounts receivable, allowance for doubtful accounts, and sales returns and allowances. What is the days' sales in receivables for the current year? Account, Current year, Prior year. Please fill out this field. We've traditionally used net sales in the DSO calculation. Calculate the net credit sales.