Days Payable Outstanding (DPO) Calculator

Days payable outstanding, or DPO, measures the average number of days your business takes to pay its suppliers. This calculator works it out from your accounts payable balance, your cost of goods sold (COGS) for the period, and the number of days in that period. It divides accounts payable by COGS, then multiplies by the days in the period to express the result in days. DPO is a core working capital measure used by finance teams, business owners and lenders to understand how a company manages its trade credit. A higher DPO means you hold onto cash longer before paying suppliers, which can improve cash flow, while a very low DPO may mean you are paying faster than you need to. That said, stretching payments too far can strain supplier relationships, cost you early settlement discounts, and signal cash pressure. New Zealand businesses use DPO alongside days sales outstanding and days inventory outstanding to build the cash conversion cycle, which shows how long cash is tied up in operations. For a fair result, use the same period for accounts payable and COGS, and consider an average payable balance when it swings a lot during the year. Use 365 days for a full year, 90 for a quarter, or 30 for a month, and keep COGS aligned to that same window. Compare your DPO with industry norms and with your agreed supplier terms, since a figure well above your standard terms suggests late payment. Tracking the trend over several periods tells you whether your payment discipline is tightening or loosening over time.

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Accounts payable ($)

Cost of goods sold ($)

Days in period

54.8 days

Days payable outstanding

DPO = (accounts payable / COGS) x days in period. Estimate only, not financial or tax advice.

How it works

DPO divides accounts payable by cost of goods sold to find the share of annual purchases still unpaid. Multiplying by the days in the period converts that share into a number of days. A higher result means slower payment to suppliers.

Worked example

With accounts payable of $90,000, COGS of $600,000 and 365 days, the ratio is 0.15. Multiplied by 365 days, DPO is 54.8 days.

Related calculators

Days Inventory Outstanding Calculator: inventory days.
Days Sales Outstanding Calculator: receivable days.
Cash Conversion Cycle Calculator: full working capital cycle.

Frequently asked questions

Is a high DPO good or bad?

A higher DPO keeps cash in your business longer, which can help working capital. However, paying too slowly can harm supplier relationships and forfeit early payment discounts. The right level balances cash flow against good supplier terms.

What period should I use?

Match the days in the period to the COGS figure you enter. Use 365 days for a full year, around 90 for a quarter and 30 for a month. Keeping them aligned gives an accurate result.

How does DPO fit the cash conversion cycle?

The cash conversion cycle is days inventory plus days sales minus days payable. A higher DPO lowers the cycle because you fund less of your operations from your own cash. It is one of three levers you can manage.