Days Sales Outstanding Calculator
Calculate your DSO in seconds, compare it with payment terms and target, and estimate the cash tied up by slower collection.
- No registration
- Four core inputs
- Instant working-capital analysis
- Practical next steps
Calculate your DSO and cash-release opportunity
Enter the figures from one reporting period. Only trade receivables and credit sales are essential; the remaining inputs sharpen the interpretation.
Your figures
Use figures from the same reporting period and exclude cash sales where possible.
Your figures stay in your browser and are not submitted to us. They are saved locally so they are pre-filled if you return.
What your DSO result actually tells you
DSO is most useful when viewed against contractual terms, target, trend and the underlying aged ledger.
Focus on the gap, not only the headline
A standalone DSO number can be misleading. The operational issue is usually the number of days beyond terms, whether performance is worsening, and which balances are driving the movement.
- Compare DSO with standard payment terms
- Track the movement against the previous period
- Translate the target gap into cash tied up
- Investigate concentration by customer and ageing band
A practical DSO improvement framework
Use the result as a trigger for targeted investigation and accountable action, not as a standalone verdict.
Validate the number
Confirm that receivables and sales cover the same period and that cash sales or unusual movements have not distorted the result.
- Reconcile to the ledger
- Review seasonality and sales growth
- Separate current, disputed and overdue debt
Locate the cause
Break the headline DSO into operational drivers rather than applying a generic collections response.
- Ageing by customer and value
- Promise-to-pay performance
- Billing and dispute root causes
Control the outcome
Assign actions, owners and dates, then monitor monthly movement alongside cash and overdue debt.
- Prioritised account plans
- Escalation milestones
- Target, forecast and actual DSO
Understanding Days Sales Outstanding
Use these explanations to interpret the calculation accurately and avoid common reporting errors.
What does DSO measure?
DSO estimates the average number of days represented by the trade receivables balance. It is commonly used to monitor collection efficiency and working-capital absorption.
Why compare DSO with payment terms?
A 45-day DSO can be relatively controlled where standard terms are 45 days, but materially weak where terms are 14 days. The gap between DSO and terms provides a more useful operational signal than DSO in isolation.
What can distort DSO?
Rapid sales growth, declining sales, seasonality, major one-off invoices, milestone billing, cash sales, credit notes, write-offs and inconsistent reporting periods can all distort the result.
What is a good DSO?
There is no universal figure. A useful target should reflect contractual terms, customer profile, sector, billing model, dispute cycle and commercial strategy. Trend and terms-adjusted performance are generally more actionable than a generic benchmark.
How often should DSO be reviewed?
Monthly review is common, with weekly supporting measures for overdue value, collections, promises to pay, disputes and high-risk accounts where tighter control is required.
Is overdue debt pushing your DSO higher?
Submit a UK business-to-business debt for a free initial review. We will assess the position and explain the practical recovery options before you decide whether to proceed.
No obligation. Submitting a debt does not authorise legal or enforcement action.