How long it takes your business to get paid?

Days Sales Outstanding Calculator

Determine how long it takes your company to collect payments after making a sale

Accounts Receivable Performance

DSO Summary

$50,000

Accounts Receivable

$300,000

Total Credit Sales

Days in Period

15.0 Days

Days Sales Outstanding

How DSO is calculated

Days Sales Outstanding = (Accounts Receivable ÷ Credit Sales) × Days in Period

You have $50,000 outstanding in accounts receivable against $300,000 in credit sales over 90 days, which works out to 15.0 Days to collect payment on average. A lower number means customers are paying faster and less cash is tied up waiting to be collected. At 15.0 days, this is a good collection speed, comfortably inside standard net-30 terms. This scale assumes roughly net-30 terms — judge it against your own invoice terms, not the scale alone.

Accounts Receivable

Ending Accounts Receivable

Credit Sales

Period Length

What is days sales outstanding?

DSO measures the average number of days between making a sale and getting paid for it. It is a collections metric, not a revenue metric. Revenue shows how much was sold. DSO shows how long it actually takes to collect that money.

Lower is better. A DSO of 20 means customers pay 20 days after the invoice. A DSO of 55 means they take nearly two months.

Here is an example. A B2B software company has $45,000 in accounts receivable at the end of the quarter. Credit sales for that quarter were $180,000 over 90 days. DSO = ($45,000 / $180,000) × 90 = 22.5 days. For a business on net-30 terms, that is a healthy number.

DSO matters because the gap between invoicing and collecting is where cash flow problems begin. A business can look profitable on paper and still struggle with payroll if customers take 60 or 90 days to pay a 30-day invoice.

Days sales outstanding calculator formula: DSO equals accounts receivable divided by credit sales times days in period, with a worked example

How to calculate your DSO?

The calculator needs three inputs:

1. Ending accounts receivable

This is the total amount customers owe at the end of the period. Find it on the balance sheet under current assets. Use the ending balance, not an average.

2. Total credit sales for the period

This is revenue from invoiced sales where payment comes later. Cash sales do not count. If a customer pays at the point of sale, that transaction does not create a receivable. Do not include it here. Mixing cash and credit sales is the most common mistake. It makes DSO look lower than it actually is.

3. Number of days in the period

Use 90 for a quarter, 365 for a full year, or the actual days in the month for a monthly calculation. Stay consistent. Quarterly DSO should only be compared to other quarterly numbers.

What your DSO number tells you?

The best way to read DSO is against two things: your payment terms and your previous DSO numbers.

Net-30 terms with a DSO of 28 means collections are working well. A DSO of 48 means customers are paying 18 days late on average. Is it one overdue account skewing the number? Or is it a pattern across the customer base? That distinction matters.

Trend is more important than any single number. A DSO moving from 30 to 38 to 46 over three quarters is a warning sign, even if 46 days does not sound extreme. Collections are slowing. The cash gap is growing.

A rising DSO can also flag customer financial trouble before it turns into a bad debt. A customer who used to pay in 25 days now taking 55 is worth a conversation before the invoice hits 90 days.

DSO varies by industry. Manufacturing often runs 45 to 60 days. Professional services sit at 30 to 45. Retail is close to zero. Compare your DSO to your own prior periods and your industry range for the most useful read.

If you are building a 12-month cash flow forecast, tools like Upmetrics factor receivables timing into projections so you can see the cash impact of a high DSO before it hits your account.

Frequently asked questions

DSO = (Accounts Receivable ÷ Total Credit Sales) x Number of Days in the period. $50,000 of receivables against $300,000 of sales over a 90-day period works out to 15 days — the average time it takes to collect payment after a sale.

It depends on your invoice terms — a business on Net 30 terms collecting in 35-40 days is performing reasonably, while the same number on Net 15 terms would signal a collection problem. As a rule of thumb, DSO meaningfully higher than your stated payment terms is worth investigating.

Customers are taking longer to pay than they used to, which ties up more cash in accounts receivable. It can signal looser collections practices, customers in financial distress, or overly generous payment terms extended to win sales — any of which deserves a closer look before it becomes a cash flow problem.

Tighten payment terms, invoice promptly rather than in batches, offer small early-payment discounts, and follow up on overdue invoices sooner rather than later. Even a few days' improvement in DSO frees up meaningful cash for a business with significant revenue on credit terms.

Yes — Days Sales Outstanding and "AR days" (or average collection period) are different names for the same calculation: Accounts Receivable ÷ Credit Sales x Number of Days. The terms are used interchangeably on financial statements and in calculators like this one.