How it works
Accounts payable turnover measures how many times per year you pay off your average outstanding payables. From that ratio, days payable outstanding (DPO) tells you the average number of days you take to pay suppliers. A DPO of 35 means you settle invoices in roughly five weeks; a DPO of 55 means nearly two months. DPO is a balancing act: paying too quickly reduces your cash on hand, while paying too slowly risks supplier friction, late fees and damaged credit terms. The sweet spot is paying on time — or just within terms — so you keep the cash working for you as long as possible without incurring penalties. The calculator compares your DPO against an industry benchmark and shows the value of any extra days of supplier financing you are capturing. Extending DPO by 10 days on $600,000 of COGS frees up roughly $16,400 in working capital — interest-free financing from your suppliers.
Formula
AP turnover = COGS ÷ Average AP | DPO = 365 ÷ AP turnover | Free financing = (DPO − industry DPO) × COGS ÷ 365
Tips
- Negotiate longer payment terms (net 45 or net 60) with suppliers before you need them.
- Pay on the last day of terms, not before — early payment wastes free financing.
- Avoid late payments: the relationship cost and potential late fees exceed the cash flow benefit.
- DPO works best alongside DSO — the spread between the two determines your cash conversion cycle.
Frequently asked questions
- What is a good accounts payable turnover ratio?
- There is no single "good" ratio — it depends on your industry and the payment terms you negotiate. A DPO of 30–45 days is typical for most B2B businesses. The goal is to pay within terms, not early and not late. Stretching DPO too far risks supplier relationships and late fees.
- How do I calculate DPO?
- Divide your cost of goods sold (COGS) by average accounts payable to get the AP turnover ratio. Then divide 365 by the AP turnover to get DPO. Average AP is (beginning AP + ending AP) ÷ 2 for the period.
- Is a higher DPO always better?
- Not necessarily. A very high DPO means you are taking a long time to pay suppliers, which can lead to strained relationships, loss of early-payment discounts, and potential supply disruptions. The goal is to optimize DPO within your payment terms, not maximize it.
- How does DPO affect cash flow?
- Higher DPO means you hold onto cash longer before paying suppliers, which improves short-term cash flow. Extending DPO by 10 days on $500K of annual COGS frees roughly $13,700 in working capital. However, this must be balanced against supplier goodwill and potential discounts for early payment.