What does DSO measure?

It measures the average number of days it takes a company to collect payment after a credit sale.

Why is a low DSO good?

Because it means your receivables convert to cash faster, improving liquidity and reducing risk of cash-flow stress.

What is considered a “good” DSO?

While it depends on industry, many sources cite under ~45 days as a common benchmark.

Are cash sales included in DSO?

Generally not, since cash sales are collected immediately (so DSO effectively zero for them) and including them would distort the metric.

DSO Calculator: Days Sales Outstanding Tool

Days Sales Outstanding (DSO) Calculator

Estimate how quickly you collect receivables. DSO = (Average A/R ÷ Net Credit Sales) × Days in Period.

Period

Custom Days

Receivables Basis

Use (Beginning A/R + Ending A/R) ÷ 2 for the period.

Net Credit Sales

Beginning A/R

Ending A/R

A/R (period end)

Results

Days Sales Outstanding (DSO) days
Receivables Turnover
Average Accounts Receivable $
Collection Efficiency

Formula

The standard formula for Days Sales Outstanding (DSO) is:

DSO = (Average Accounts Receivable ÷ Net Credit Sales) × Number of Days in Period

Where “Average Accounts Receivable” often equals (Beginning AR + Ending AR)/2.

A simplified version:

DSO = (Accounts Receivable ÷ Total Sales) × Number of Days

Monthly DSO & Receivables Metrics (example data)
Period	Credit Sales	Beginning A/R	Ending A/R	Average A/R	Days in Period	Avg Daily Sales	DSO (days)	Receivables Turnover (×)	Best-Possible DSO (days)
Apr 2025	120,000.00	80,000.00	85,000.00	82,500.00	30	4,000.00	20.63	1.45	10.00
May 2025	135,000.00	85,000.00	90,000.00	87,500.00	31	4,354.84	20.09	1.54	9.65
Jun 2025	125,000.00	90,000.00	88,000.00	89,000.00	30	4,166.67	21.36	1.40	9.84
Jul 2025	140,000.00	88,000.00	92,000.00	90,000.00	31	4,516.13	19.92	1.56	9.52
Aug 2025	150,000.00	92,000.00	95,000.00	93,500.00	31	4,838.71	19.32	1.60	9.09
Sep 2025	145,000.00	95,000.00	93,000.00	94,000.00	30	4,833.33	19.45	1.54	9.00
Notes & formulas: Average A/R = (Beginning A/R + Ending A/R) / 2 Avg Daily Sales (ADS) = Credit Sales / Days in Period DSO = Average A/R / ADS Receivables Turnover = Credit Sales / Average A/R Best-Possible DSO ≈ Current (not past-due) A/R / ADS

How to Use the DSO Calculator

Decide your period: monthly, quarterly or annually.
Gather your Accounts Receivable at beginning and end of the period (or use ending balance if simpler).
Gather Net Credit Sales or Total Sales for the same period (exclude cash sales if possible).
Plug into the formula: (Average AR ÷ Net Credit Sales) × Number of Days.
Interpret results:
- - If DSO is increasing, your collections may be weakening or credit terms loosening.
- Compare your DSO with industry peers and historical trend to identify issues.
- Use the metric to monitor and improve your working-capital/receivables process.

Frequently Asked Questions

It measures the average number of days it takes a company to collect payment after a credit sale.
Because it means your receivables convert to cash faster, improving liquidity and reducing risk of cash-flow stress.
While it depends on industry, many sources cite under ~45 days as a common benchmark.
Generally not, since cash sales are collected immediately (so DSO effectively zero for them) and including them would distort the metric.

Methodology & Sources

Bibliography

CFI Team Days Sales Outstanding (DSO) — Corporate Financial Institute https://corporatefinanceinstitute.com/resources/accounting/days-sales-outstanding/**
Accessed 2025-11-03

Days Sales Outstanding (DSO) Calculator

Results

What It Means

Formula

How to Use the DSO Calculator

Decide your period: monthly, quarterly or annually.

Gather your Accounts Receivable at beginning and end of the period (or use ending balance if simpler).

Gather Net Credit Sales or Total Sales for the same period (exclude cash sales if possible).

Plug into the formula: (Average AR ÷ Net Credit Sales) × Number of Days.

Interpret results:

Frequently Asked Questions

Methodology & Sources

Bibliography

Other Calculators in Corporate Finance & Analysis

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Days Inventory Outstanding (DIO) Calculator

Days Payables Outstanding (DPO) Calculator

Accounts Receivable Turnover Calculator

Working Capital Calculator

Current Ratio Calculator