How Many Cars Does an Auto Repair Shop Service Per Day?
Venbit TeamUpdated July 24, 20267 min readThe short answer
General auto repair shops average 2.2 vehicles per bay per day, so a six-bay shop services about 13 vehicles daily. Smaller two to three bay shops run 5 to 15 a day, and four to six bay shops reach 20 to 30. Healthy utilisation sits at 60 to 80% of theoretical capacity.
Key takeaways
- ✓2.2 vehicles per bay per day is the benchmark figure, and it comes from a structured industry survey rather than anecdote.
- ✓Two to three bay shops run 5 to 15 vehicles a day; four to six bays reach 20 to 30.
- ✓Bay count is the hard ceiling. No amount of scheduling produces a thirty-car day in a three-bay shop.
- ✓60 to 80% of theoretical capacity is the healthy target. Running at 100% raises comeback rates and blows promised times.
- ✓Car count and repair order value move in opposite directions. A shop doing fewer vehicles at higher ARO is often the better business.
Most benchmarks in the service trades come from forum threads and owners comparing notes. This one is different, because the aftermarket has actually surveyed it, which makes it the most reliable figure in this whole series.
Below is the per-bay benchmark, the ranges by shop size, and the reason the shops running at full theoretical capacity are usually the ones with the worst numbers underneath.
The benchmark ranges
Vehicles serviced per day, measured against bay count, which is the only denominator that makes these comparable across shops.
| Shop size | Vehicles per day | Per month |
|---|---|---|
| Benchmark, per bay | 2.2 | About 45 to 50 per bay |
| Two to three bays | 5 to 15 | 150 to 300 |
| Four to six bays | 20 to 30 | 400 to 450 |
| Typical six-bay shop at benchmark | About 13 | About 280 |
●The figure worth quoting
PartsTech's benchmark report on US general repair shops found shops average 2.2 vehicles per bay per day, which works out to roughly 13 vehicles for a six-bay shop. Of every number in this benchmark series, this is the one drawn from a large structured survey.
Source: PartsTech, State of General Auto Repair Shops in the United States
Bay count is the ceiling, and it is a hard one
Everything else in a repair shop is negotiable. Bay count is not. A vehicle occupies physical space for the duration of the work, and that space cannot be double-booked the way an appointment slot can.
This is why the per-bay figure is the only honest way to compare shops. A three-bay shop doing nine cars a day is running well above benchmark. A ten-bay shop doing fifteen is running well below it. The raw daily count tells you nothing without the denominator.
It also means the growth question for most shops is not how to move more cars through the existing bays but whether the next bay pays for itself. At 2.2 vehicles per bay per day and your own average repair order, that is a calculation you can actually run rather than guess at.
Running flat out is the wrong target
The aftermarket has been fairly clear on this: shops should aim for sixty to eighty percent of theoretical bay capacity. Above that, error rates climb, jobs slip past promised times, and comebacks increase.
The reason is that repair work has high variance. A brake job turns into a seized caliper and a rusted line. A diagnostic that was quoted at an hour becomes three. If every bay is committed at open, the first overrun cascades through the day and the customer who was promised four o'clock gets a phone call instead of a car.
So a shop physically capable of twenty vehicles a day that books twenty is not maximising anything. It is queueing, and it is spending its reputation to do it. The slack is what absorbs the overrun and the profitable emergency walk-in.
- ✓Comeback rate, which rises when the shop is over-committed
- ✓On-time delivery, which is what customers actually remember
- ✓Technician efficiency, which falls under sustained overload
- ✓Diagnostic accuracy, which suffers most when everyone is rushed
Car count and repair order value pull against each other
A shop chasing car count optimises for short jobs: oil changes, tyres, brakes, quick diagnostics. Throughput goes up and average repair order goes down.
A shop chasing average repair order takes the bigger work: timing jobs, engine and transmission work, complex electrical diagnosis. Cars per day falls and revenue per car rises substantially.
Neither is wrong, but comparing yourself to the wrong model is how an owner concludes their shop is slow when it is actually doing more profitable work. Look at daily revenue per bay rather than cars per bay if you want the number that settles the argument.
The phone is the bottleneck more often than the bays
A repair shop's front counter is one of the busiest positions in the trades. The same person is writing up an arrival, explaining an estimate to a customer who is standing there, chasing a parts delivery, and answering a phone that does not stop.
So calls go unanswered during exactly the hours when people are calling. Someone whose car is making a noise phones three shops on their lunch break and books with whoever picks up and can give them a day. If your counter was mid-conversation, you were not in the running and you never knew.
This shows up as unused bay capacity, which owners then read as a demand problem and try to fix with advertising. Frequently the demand already arrived and could not get through.
●Where Venbit fits
A Venbit voice and chat agent answers while your service writer is with a customer at the counter, handles the hours, pricing approach, and can-you-look-at-it-today questions, and captures the vehicle details and callback number so the caller stops phoning around. See the auto dealer and shop playbook or start free.
Measuring your own number
Count completed repair orders per working day across a full month, then divide by bay count to get your per-bay figure. Compare that to 2.2 rather than comparing your raw total to another shop's raw total.
Put average repair order and on-time delivery beside it. Those three together tell you whether a low count is a problem, a deliberate strategy, or a symptom of over-commitment.
If you are under 2.2 per bay and your bays are sitting empty, the next thing to check is not marketing spend. It is how many calls came in and how many were answered.
Frequently asked questions
How many cars does an auto repair shop service per day?+
Shops average 2.2 vehicles per bay per day, so a typical six-bay shop services around 13 vehicles. Two to three bay shops run 5 to 15 daily, and four to six bay shops reach 20 to 30.
How many cars can one mechanic work on in a day?+
It depends far more on job type than on the technician. A day of oil changes and brake jobs might mean five or six vehicles, while a single timing or transmission job can occupy a technician and a bay for the entire day.
What is a good bay utilisation rate for a repair shop?+
60 to 80% of theoretical capacity. Running at 100% raises comeback rates, pushes jobs past promised delivery times, and leaves no slack to absorb the overruns that repair work regularly produces.
Should I add a bay to increase car count?+
Possibly, and it is one of the few growth decisions you can calculate rather than guess. At 2.2 vehicles per bay per day multiplied by your average repair order, you can work out the revenue a new bay should produce and compare it to the cost.
Is a low car count always bad?+
No. Shops taking larger diagnostic and mechanical work move fewer vehicles at a much higher average repair order. Compare revenue per bay rather than cars per bay before concluding anything.
Conclusion
Two point two vehicles per bay per day is the number to benchmark against, and bay count is the denominator that makes any comparison meaningful. A three-bay shop at nine cars is outperforming a ten-bay shop at fifteen.
If you are under it with empty bays, resist the urge to spend on advertising first. Count the calls that came in and the calls that were answered, because a busy front counter turns arriving demand into unused capacity without anybody noticing.
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