Tool
Days Sales Outstanding (DSO) Calculator
See how many days, on average, it takes to collect on credit sales. Lower DSO means cash in the door faster.
Results
- Days Sales Outstanding
- 36.5 days
DSO = (accounts receivable ÷ credit sales) × days in period. Lower is better — it's how long cash is tied up in unpaid invoices.
A worked example — your numbers
You're carrying $50,000 in unpaid invoices against $500,000 of credit sales over 365.0 days.
DSO = ($50,000 ÷ $500,000) × 365.0 = 36.5 days.
How to read your result
On average it takes about 36.5 days to collect after a sale. Compare that to your stated terms: if you bill net-30, anything much past ~40 days means invoices are drifting late and cash is sitting in customers' hands instead of yours.
Shaving days here is free cash. Faster invoicing, clear terms, easy payment methods, and prompt follow-up on overdue accounts all pull this number down.
This calculator provides directional estimates for informational purposes only and is not tax, legal, or financial advice. Results depend on the inputs you provide. For advice specific to your situation, book a Discovery Meet.
What this calculator does
Days Sales Outstanding measures how long, on average, it takes to collect cash after you make a credit sale. This tool turns your accounts receivable and credit sales into a single number of days. It's built for owners who want to know whether slow-paying customers are quietly tying up the cash their business needs to operate.
How it works
DSO = (accounts receivable ÷ credit sales) × days in the period. It expresses your outstanding receivables as an average number of days' worth of sales.
Use the same period for AR and sales (a year, a quarter, a month) and match the 'days in period' to it. Lower DSO means you're collecting faster and cash is coming in sooner.
Common mistakes
- ·Including cash sales. DSO is about credit sales only; mixing in cash or card-on-delivery sales understates the true collection time.
- ·Looking at one month in a seasonal business. A single period can mislead; track the trend across periods.
- ·Treating a low DSO as always good. An extremely low DSO can mean overly strict terms that cost you sales — balance collection speed against competitiveness.
Frequently asked questions
What is a good DSO?+
It depends on your payment terms and industry. A common rule of thumb is that DSO should be no more than about a third higher than your standard terms — so for net-30, under ~40 days is healthy. Compare to your own terms and trend, not a universal number.
Why does DSO matter?+
It measures how fast sales turn into usable cash. High DSO means money is locked in receivables, which can force you to borrow or delay your own payments even while the business is profitable on paper.
How do I lower DSO?+
Invoice immediately, state terms clearly, offer easy payment methods, follow up on overdue accounts promptly, and consider deposits or early-payment discounts. Each shortens the gap between sale and collection.
Should I include cash sales?+
No. DSO is specifically about credit sales — sales where the customer pays later. Including immediate cash or card sales would understate how long credit customers actually take to pay.
Want a real answer, not just a calculator?
A calculator gives you a directional number. A free Discovery Meet gives you a CPA who reviews your actual books, structure, and goals.
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