Dental office turnover cost calculator

One dental assistant walking out the door costs a $1.2M practice about $29,418. That's 2.94 times the $10,000 that the Dental Assisting National Board estimates as the average cost of dental assistant turnover, according to Dental Economics. The gap isn't because DANB is wrong. It's because the $10,000 figure counts what you write checks for, and most of the damage never shows up as a check. It shows up as chairs that ran slower, days that ended early, and a doctor who spent three weeks doing two jobs.

Below is the calculator, the arithmetic behind it, and the one number it should change in your budget.

What the $10,000 estimate misses

Replacement-cost estimates usually cover the visible line items: job board fees, background checks, the temp agency invoice, maybe some training hours. Those are real, and in the scenario below they add up to $3,736. They're also the smallest bucket of the four.

The expensive buckets are production buckets. Dental Economics puts a number on the first one: each day a dental assistant position stays vacant costs roughly a 6% reduction in daily revenue. That's not a rounding error. On a practice collecting $6,200 a day, 6% is $372 of production that doesn't happen, every single clinical day, until the seat is filled.

The second production bucket is the one nobody budgets for: the ramp. A new assistant who has never worked your operatories, your software, or your doctor's hand signals does not run at the speed of the person who left. That gap is smaller than a vacancy but it lasts longer.

The four buckets in a turnover cost calculator

• Lost production during the vacancy. Daily collections multiplied by the daily revenue hit, multiplied by the number of clinical days the seat sits empty.
• Coverage costs. Temp agency day rates, staff overtime, or the hygienist you pulled to assist while her own column sat empty.
• Ramp drag. The production gap between a new hire and the person who left, for as many clinical days as it takes to close it.
• Hard costs. Advertising, screening time, credentialing, and paid double-coverage onboarding hours.

Every one of those inputs is a number you already have or can estimate within 10%. Nobody needs a consultant for this. What people need is to actually run it once, because the total is usually three times what they assumed.

Operator Math

Single-doctor general practice. Two assistants, two hygienists. The practice collects $6,200 on an average clinical day and works 192 clinical days a year, so $1,190,400 in annual collections. One assistant gives two weeks' notice in March.

Bucket 1: the vacancy. The 6% daily revenue reduction that Dental Economics reports works out to $372 of lost production per clinical day. The seat stays empty for 45 clinical days, which is nine working weeks, and that's optimistic in a market this tight. Lost production comes to $16,740.

Bucket 2: coverage. You bring in a temp for the eight heaviest days, the crown-and-bridge days you can't run short. The agency bills $38 an hour for an eight-hour day, so $304 a day. Eight days of coverage costs $2,432. Note what this bucket does not do: it doesn't erase bucket 1. A temp who doesn't know your setup keeps the schedule from collapsing, but it still runs slow.

Bucket 3: the ramp. Your new assistant starts in late May. She's competent, but she's new. Call the production gap 3% of daily collections, half the hit of an empty seat, which is $186 a day. It takes 35 clinical days, about seven working weeks, before she's turning rooms and anticipating instruments at the speed of the person who left. Ramp drag costs $6,510.

Bucket 4: hard costs. Job postings across two boards, $600. Your office manager spends 25 hours writing the posting, screening 30 applicants, scheduling working interviews, and processing new-hire paperwork, at $33 an hour fully loaded, so $825. Then paid onboarding overlap: 100 hours where the new assistant is on the clock learning instead of producing. The Bureau of Labor Statistics put the median annual pay for dental assistants at $48,070 in May 2025, which is $23.11 an hour across 2,080 hours. A hundred paid onboarding hours costs $2,311. Hard costs total $3,736.

The total. Add the four buckets: $16,740 plus $2,432 plus $6,510 plus $3,736 equals $29,418. That's 2.9418 times the $10,000 DANB average. It's also 2.47% of annual collections, gone, from one person changing jobs.

Run that number against your own inputs before you argue with it. If your daily collections are $9,000 instead of $6,200, bucket 1 alone is $24,300 at the same 45-day vacancy. Higher production practices have more to lose per empty day, not less.

A hygienist vacancy is worse, and it lasts longer

Assistants are hard to replace. Hygienists are harder. The ADA Health Policy Institute found that only 60% of dentists report having an adequate number of dental hygienists on staff, meaning 40% are running short right now. Among dentists actively recruiting a hygienist, 91% called it very or extremely challenging. That's not a hiring problem, that's a market condition, and it means your vacancy assumption for hygiene should be longer than the one you use for assisting.

The math also works differently. A hygiene chair is a revenue center with its own column, so when it goes dark you lose the whole column, not a percentage of the practice's day. You do stop paying the wage, so net it out.

Say your hygienist produced $1,150 a day. The Bureau of Labor Statistics reported median annual pay for dental hygienists at $98,100 in May 2025, which is $47.16 an hour across 2,080 hours. That's $377.28 in wage per eight-hour day you're no longer paying. Net loss per dark day is $772.72. At 60 clinical days to fill, which is conservative given that 91% of recruiting dentists call it very or extremely challenging, the vacancy costs $46,363.20.

Lose one assistant and one hygienist in the same year and you're out $75,781.20, or 6.37% of collections on the practice above. That's more than most owners spend on their entire marketing budget, and it buys nothing.

The supply picture says this doesn't loosen soon. BLS counts 225,300 dental hygienist jobs nationally with 8% projected growth from 2025 to 2035, which is about 18,024 additional seats to fill on top of normal churn. Assisting is 388,600 jobs with 7% projected growth, roughly 27,202 more seats. Demand for these people is growing faster than the average occupation while you're competing for them.

What this should change in your budget

Here's the decision the calculator actually informs. You have an assistant you'd hate to lose. She's at $45,000 and market is $48,070 per BLS. You're weighing a $4,000 raise and you've been treating it as a $4,000 expense.

It isn't. It's a bet against a $29,418 loss. If that raise plus a schedule change cuts her probability of leaving this year from 25% to 10%, you've bought a 15-point reduction in risk. Expected savings are $4,412.70. The raise costs $4,000. You're up $412.70 in year one and the raise keeps working in year two.

That's a thin margin on purpose, because retention spending isn't automatically smart. A $12,000 raise on the same risk reduction loses money. The point is that you can't evaluate any of it until turnover has a dollar figure attached, and $10,000 is the wrong figure to plug in.

Two inputs deserve a hard look before you trust your total. First, your real vacancy duration, not the one you hope for. Pull your last three hires and count clinical days from resignation to first productive day. Second, your ramp length. Most owners guess two weeks. Watch your own turnaround times and you'll usually find six to eight.

A note on what's not in this article: The Dental Signal has only 7 validated practice submissions on staffing cost right now, and we don't publish a benchmark under 30. Every number above comes from BLS, ADA HPI, or DANB by way of Dental Economics, plus scenario inputs you should replace with your own.

The Takeaway

Price your next turnover before it happens: daily collections times 6% times your real vacancy days, plus coverage, plus ramp drag, plus hard costs. Use your last three hires to get the vacancy and ramp numbers instead of guessing, and run it separately for assisting and hygiene because the hygiene math is bigger and the vacancy is longer. Then compare that total against what it would cost to keep the people you have, whether that's a raise to the $48,070 BLS median, a four-day schedule, or paid CE. If a retention move costs less than the expected value of the turnover it prevents, make the move this quarter, not at your next review cycle.

Turnover doesn't show up on your P&L with a label. It hides inside your staff cost percentage and your overhead line, which is exactly why it goes unmanaged for years. Drop your collections, payroll, and staff count into the free overhead calculator and see where your staff cost sits against the practices we've validated, then re-run it with one turnover event priced in to see how much of your overhead is actually churn. Run your own numbers, and your submission helps build the staffing benchmark we're still 23 practices short of publishing.