Accounts Payable Turnover Calculator
The accounts payable turnover ratio measures how efficiently a business manages its supplier payment obligations. Paying suppliers too quickly uses cash that could be deployed elsewhere; paying too slowly risks supplier disputes, supply disruptions, or loss of early-payment discounts. Days payable outstanding (DPO) translates the ratio into the average number of days between receiving an invoice and paying it. Tracking DPO relative to your payment terms shows whether you are effectively using the supplier credit you have negotiated.
Accounts payable turnover formula
AP Turnover = COGS / Average Accounts Payable
Days Payable Outstanding (DPO) = 365 / AP Turnover
Example: COGS $900,000, Average AP $75,000. AP Turnover = $900,000 / $75,000 = 12.00 times. DPO = 365 / 12 = 30.42 days.
Optimising accounts payable
- If DPO is lower than your supplier payment terms, consider whether you are paying early unnecessarily.
- If DPO exceeds your agreed terms, review whether payment delays are intentional or indicative of cash flow problems.
- Capture early-payment discounts when the discount rate exceeds your cost of capital.
- Use DPO in conjunction with DIO and DSO to manage your overall cash conversion cycle.
Frequently asked questions
What is the accounts payable turnover ratio?
The AP turnover ratio measures how many times a business pays off its average accounts payable balance during a period. It is calculated as COGS divided by average accounts payable. A higher ratio means the business pays suppliers more frequently.
What is days payable outstanding?
Days payable outstanding (DPO) is 365 / AP Turnover. It expresses the average number of days a business takes to pay its suppliers. A higher DPO means the business holds on to cash longer before paying suppliers.
Is a higher or lower AP turnover ratio better?
It depends on context. A lower AP turnover ratio (higher DPO) means the business is taking longer to pay suppliers, which conserves cash but may strain supplier relationships. A very high turnover ratio may indicate the business is paying too quickly and missing opportunities to use supplier credit.
How does DPO factor into the cash conversion cycle?
The cash conversion cycle is DIO + DSO - DPO. A higher DPO reduces the CCC, meaning the business effectively receives free financing from suppliers. Managing DPO alongside DIO and DSO is key to working capital optimisation.
Should I use total purchases or COGS in the formula?
Strictly speaking, total purchases (COGS + ending inventory - beginning inventory) is the most accurate numerator because it represents what was actually bought on credit. However, many analysts use COGS as an approximation when purchase data is not separately disclosed.
Official sources
- FASB ASC 405: Liabilities.
- SBA: Manage Your Business Finances.
Reviewed by the CalculatorHub team, edited by James Graham, 15 June 2026. See our methodology.