Days in AR Calculator
Days in AR tells you how long, on average, your money sits with payers before it reaches your bank. Enter two numbers from your own reports and get the answer instantly.
Days in AR is the single most-watched number in medical billing. It compresses your whole collection cycle — claim submission, payer processing, denials, follow-up — into one figure: the average number of days of billings currently trapped in accounts receivable.
Calculate your days in AR
The formula
Days in AR = Total AR ÷ (Annual gross charges ÷ 365). The term in brackets is your average daily charge volume. Dividing total receivables by it shows how many days of billings are outstanding. Our full guide to days in accounts receivable walks through a worked example and the aging buckets behind the number.
Reading your result
- Under 30 days — excellent territory; few practices sustain this across all payers.
- 30–40 days — the range many healthy practices land in; Medicare and large commercials set the pace.
- 40–50 days — worth investigating: usually a denial backlog, slow follow-up on one or two payers, or eligibility misses.
- Over 50 days — revenue is leaking into old aging buckets, where collectability falls sharply. Start with the AR follow-up basics in our guide to AR follow-up strategies.
These bands are the guideposts practices commonly use, not guarantees — specialty, payer mix and procedure type all shift what is realistic. Track the trend monthly rather than chasing a single reading; days in AR is one of the core medical billing KPIs worth a standing place on your dashboard.
Frequently asked questions
What is a good days in AR for a medical practice?
Many practices aim to stay between 30 and 40 days, and under 30 is considered excellent. The realistic target depends on your payer mix and specialty — a practice heavy in workers' compensation or out-of-state Medicaid will naturally run higher than one dominated by Medicare and large commercial plans.
Should I use gross charges or net charges in this calculator?
Use gross (total) charges for the standard formula, and be consistent month to month. Some consultants compute days in AR on net charges instead; either version is useful for trending, but mixing the two makes comparisons meaningless.
Why did my days in AR jump suddenly?
The usual causes are a payer slowdown or system change, a spike in denials nobody is working, credentialing or enrollment lapses that park claims, or a charge-entry backlog. A jump of more than a few days in one month is worth a payer-by-payer aging review.