DSO Calculator

Calculate your company's Days Sales Outstanding (DSO) by entering your beginning accounts receivable, ending accounts receivable, total credit sales (revenue), and the number of days in the period. You'll get back your DSO value — the average number of days it takes your business to collect payment after a sale — along with the average accounts receivable used in the calculation. Also try the find Return on Invested Capital (ROIC) with ROIC Calculator.

Accounts receivable balance at the start of the period.

Accounts receivable balance at the end of the period.

Total credit sales or net revenue for the period.

days

Use 365 for annual, 90 for quarterly, or 30 for monthly.

Results

Days Sales Outstanding (DSO)

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Average Accounts Receivable

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Accounts Receivable Turnover

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Collection as % of Revenue

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Frequently Asked Questions

What is Days Sales Outstanding (DSO)?

Days Sales Outstanding (DSO) is a financial metric that measures the average number of days a company takes to collect payment after making a credit sale. A lower DSO indicates faster cash collection and better liquidity, while a higher DSO suggests slower collections and potential cash flow challenges.

How is DSO calculated?

DSO is calculated using the formula: DSO = (Average Accounts Receivable ÷ Net Credit Sales) × Days in Period. Average accounts receivable is the mean of the beginning and ending A/R balances. For example, if average A/R is $275,000, credit sales are $5,000,000, and the period is 365 days, DSO = ($275,000 ÷ $5,000,000) × 365 = 20.1 days.

What is a good DSO value?

A good DSO is generally as close to your payment terms as possible. If your business has 30-day payment terms, a DSO near 30 is ideal. As a rule of thumb, a DSO under 45 days is considered healthy for most industries, though benchmarks vary significantly by sector. High-value industries like construction may have naturally higher DSOs.

What is the difference between DSO and accounts receivable turnover?

Accounts receivable turnover measures how many times per period a company collects its average A/R balance (Net Revenue ÷ Average A/R). DSO converts this into days by dividing the period days by the turnover ratio. Both metrics measure collection efficiency but from different angles — turnover as a frequency, DSO as a duration.

Why should businesses monitor DSO regularly?

Monitoring DSO helps businesses identify trends in payment collection, manage cash flow, and reduce the risk of bad debts. Regular tracking — monthly or quarterly rather than annually — provides more accurate averages and helps management take timely action if collections start slowing down.

How can a company lower its DSO?

Companies can reduce DSO by offering early payment discounts, tightening credit policies, sending invoices promptly, following up on overdue accounts consistently, and using automated billing and reminder systems. Reviewing customer creditworthiness before extending credit also helps prevent high DSO situations.

Does DSO differ by industry?

Yes, DSO benchmarks vary widely by industry. Retail businesses often have very low DSOs because sales are mostly cash-based, while manufacturing, construction, or B2B services companies typically carry higher DSOs due to extended credit terms. Always compare your DSO against industry-specific averages for meaningful analysis.

Should I use total sales or only credit sales when calculating DSO?

You should use only credit sales (not cash sales) in the DSO formula, since DSO specifically measures how long it takes to collect on credit transactions. Including cash sales would artificially lower your DSO and misrepresent your actual collection performance. Net revenue is acceptable when credit sales data is unavailable.