DSO Calculator
DSO is a number of days, but this DSO calculator also prices them, since that is the figure that gets a decision made: every day of collection is a day of revenue sitting in somebody else's bank account.
Days sales outstanding
- Days sales outstanding $620,000 of receivables over $13,151 of sales a day. That is 17.1 days past your stated 30-day terms.
- 47.1 days
- Cash tied up beyond terms Collecting on time would release this, once. It is a one-off release of working capital, not a saving that repeats, and that distinction is the one most often gotten wrong when this is presented to a board.
- $225,479
- What those days cost a year $225,479 financed at 12%. This is the recurring number: the carrying cost of the float, not the float itself.
- $27,057.53
- Each day of DSO is worth One day off the collection period releases this much cash. It is the figure to quote when arguing for a collections hire or an invoicing change, because it converts a process argument into a cash one.
- $13,151
- Receivables turnover Sales over receivables. The reciprocal of DSO scaled by the period: 365 / 7.74 = 47.1 days. Both describe the same thing and finance teams quote whichever is more flattering.
- 7.74x
- Days inventory outstanding $480,000 of stock over $7,945 of cost a day. Measured on COGS, not revenue. Using revenue here understates it by the whole gross margin and is a common error.
- 60.4 days
- Days payables outstanding How long you take to pay. This is the only one of the three where a bigger number helps your cash, which is why stretching payables is the lever everyone reaches for first and the one that costs supplier goodwill.
- 39 days
- Cash conversion cycle 47.1 + 60.4 - 39. Cash leaves for 68.5 days before it comes back, so growth consumes working capital: every extra dollar of sales needs about $0.19 of cash behind it.
- 68.5 days
| DSO | Receivables | Cash released | vs today |
|---|---|---|---|
| 47.1 days | $620,000 | $0 | today |
| 42.1 days | $554,247 | $65,753 | 5 days better |
| 37.1 days | $488,493 | $131,507 | 10 days better |
| 30 days | $394,521 | $225,479 | 17.1 days better |
| 27 days | $355,068 | $264,932 | 20.1 days better |
- DSO uses credit sales, not total sales. Including cash sales inflates the denominator and makes collection look better than it is.
- Days inventory is measured on cost of goods sold and days receivable on revenue. Mixing the two bases is the most frequent error in a cash conversion cycle, and it always flatters the result.
How the DSO Calculator works
Days sales outstanding is how long it takes to get paid, expressed in days: receivables divided by sales per day. $620,000 of receivables against $4.8m of annual credit sales (about $13,150 a day) is 47 days.
The denominator is credit sales rather than total sales, and getting that wrong is the most common error in the calculation. Cash sales were never receivable, so including them inflates the denominator and shortens the apparent collection period. A retailer with mostly card payments and a small trade book can report a DSO of four days that tells you nothing about the trade book, which is the part that actually has a collection problem.
The number on its own means very little without your terms beside it. A DSO of 47 on net-30 terms means customers are 17 days late on average. The same 47 on net-45 terms means collection is working. The figure to watch is the gap, not the level, and a business that lengthens its terms to win deals should expect DSO to follow and not treat it as deterioration.
What makes DSO worth calculating rather than only observing is the conversion into cash. Every day of collection period is one day of revenue sitting in a customer's bank account instead of yours. At $13,150 a day, cutting DSO by ten days releases $131,500, once. That one-off is the thing most often misrepresented: it is a release of working capital, not an annual saving, and presenting it as recurring revenue improvement is how collections projects get approved and then disappoint. The genuinely recurring figure is the carrying cost: what it costs to finance that float for a year at your cost of capital.
The per-day figure is the most useful output of this calculator, because it converts a process argument into a cash one. "Our invoicing is slow" is a complaint. "Each day of DSO is $13,150 and invoicing two days earlier pays for the hire" is a decision.
DSO is one leg of a three-part cycle. Days inventory outstanding is how long stock sits before it sells; days payables outstanding is how long you take to pay suppliers. Add the first two and subtract the third and you get the cash conversion cycle: the number of days between paying for something and being paid for it.
A positive cycle means growth consumes cash. Every additional dollar of sales needs working capital behind it for that many days, which is why profitable companies run out of money while growing quickly: the profit is real, and it is tied up in receivables and stock. A negative cycle means you are paid before you pay, so growth funds itself. That is the structural advantage behind supermarkets, subscription businesses and marketplaces that hold funds, and it is worth more than most margin improvements.
One measurement trap in the cycle: days inventory is computed on cost of goods sold and days receivable on revenue, because stock is carried at cost and invoices are raised at price. Using revenue for both is a frequent mistake and it always shortens the inventory leg by the whole gross margin, making the cycle look better than it is.
Finally, averages hide concentration. A DSO of 47 can be every customer paying at 47 days, or most paying at 30 with one large account at 120. Those are different problems with different fixes, and only an aging report tells them apart. Compute DSO to know the size of the question; read the aging to know what to do about it.
DSO Calculator FAQ
How do you calculate DSO?
Accounts receivable divided by credit sales for the period, times the number of days in that period. $620,000 of receivables against $4.8m of annual credit sales is (620,000 / 4,800,000) x 365, or about 47 days. Use credit sales rather than total sales. Cash sales were never receivable, and including them understates the collection period.
What is a good DSO?
It depends almost entirely on your terms. On net-30, anything under about 40 days is working well and over 45 suggests a collections problem. The useful comparison is DSO minus your stated terms: that gap is how late the average customer is, and it is comparable across businesses in a way the raw number is not.
What is the difference between DSO and receivables turnover?
They are the same measurement inverted. Turnover is sales divided by receivables: how many times the book turns over in a period. DSO is days in the period divided by turnover. A 7.7x turnover on a year is 47 days. Finance teams tend to quote whichever sounds better.
What is the cash conversion cycle?
Days inventory plus days sales outstanding minus days payables outstanding: the gap between paying for something and being paid for it. Positive means growth consumes cash, which is how profitable companies run out of money while growing. Negative means you are paid before you pay, so growth funds itself.
How much cash will reducing DSO release?
One day of DSO equals one day of credit sales. At $4.8m a year that is about $13,150 a day, so ten days off releases roughly $131,500. Treat that as a one-off release of working capital rather than an annual saving. The recurring benefit is only the cost of financing that money, which at a 12% cost of capital is about $15,800 a year.