Know exactly what your detailing shop nets per job and per month — with parts markup margin separated from labor revenue so you can see which side of the business drives your profit.
A mobile detailer doing six cars a day at $150 feels like he's printing money — $900 in the bank by sundown. Then the ceramic coating, the foam cannon refill, the microfiber towels, the fuel to four driveways, and the cost of the kid he hired to wipe down interiors all take their cut, and the real take-home per car is a number he's never once stopped to calculate. This calculator stops to calculate it. You enter Jobs Per Week, Avg Labor Per Job, Avg Parts Per Job, and a Parts Markup percentage — the tool splits your labor revenue from your parts margin, then subtracts monthly rent, employee wages, and overhead to show net profit and per-job profit side by side.
Parts markup is where detailing shops either make or leave significant money. At a 50% markup on $30 in supplies per job, you're adding $15 in margin per vehicle. Across 65 jobs per month, that's nearly $975 in additional margin — on top of labor revenue. The tool shows this as a separate Parts Margin KPI so you can evaluate whether your markup rate is competitive and whether your supplier pricing needs renegotiation.
Labor revenue versus parts margin: why both matter
Labor revenue is the predictable core of a detailing operation: jobs times hours times rate, simplified here as jobs times average labor value. Parts margin is the compounding opportunity that many detailers underutilize. If your standard detail uses $30 in supplies — ceramic coating prep, interior cleaner, dressings, protective coatings — and you charge those materials at cost plus 50%, you're generating $15 per job without scheduling an extra appointment. At $45 in materials with a 40% markup, the parts margin is $18 per job.
The tricky part is that parts markup percentage varies widely by what you sell. Basic wash supplies marked up 50% is reasonable. Premium paint correction compounds and ceramic coatings can carry 60-80% markup with customers who understand they're buying professional-grade product at retail. Track your materials cost separately by service tier if you offer both basic and premium packages.
How employee wages reshape the profit picture
A solo detailer carrying no employee wages keeps the math simple: gross revenue minus materials minus overhead equals take-home. The moment you hire a detailer, wages become your largest variable cost. At $3,000/month in employee wages on a 15-job-per-week schedule, wages alone run $750 per week — meaning your employee needs to generate at least one and a half additional billable jobs per week just to cover their own cost before contributing to profit.
The default of $3,000/month in wages is roughly full-time at $17-$18/hour. If you're using part-time labor or a commission structure, adjust wages downward and capture the upside in additional jobs per week. The calculator shows Per Job Profit as a KPI — if this number drops below $20 after wages are included, your shop is working hard for thin margins and a pricing or volume conversation is overdue.
Job volume and the breakeven threshold you need to know
At $1,500 in monthly rent, $3,000 in wages, and $800 in overhead, your fixed monthly cost is $5,300 — before any materials. At an average labor charge of $150 per job with 50% parts markup on $30 in supplies, each completed job contributes roughly $160 in gross margin. Your breakeven is approximately 33 jobs per month — less than 9 jobs per week on a five-day schedule. Anything above that contributes net profit.
Knowing your breakeven job count is useful for scheduling decisions. If you're consistently clearing 55-65 jobs per month, you have runway to absorb a slow week or a staff change. If you're hovering at 35-40 jobs per month, you're running close to the line and a single equipment breakdown or slow week turns the month cash-flow negative. Run the tool at your actual numbers and see where your breakeven falls.
Pricing a service upgrade without guessing
Adding a ceramic coating package at $350 labor and $80 in materials changes your average job value significantly. If ceramic coatings represent 20% of your monthly volume, your blended average labor per job rises. You can model this directly: raise the Avg Labor Per Job input to reflect your new blended rate and adjust Avg Parts Per Job to reflect the higher materials content of the upgraded service. The net profit output tells you whether the mix shift is actually more profitable or just higher-revenue.
Revenue growth without margin growth is just complexity. A shop adding ceramic coating without raising the markup rate on materials and without accounting for the additional labor time per job may see higher gross revenue but flat net profit. The per-job profit output is the sanity check: if it stays flat or drops as your average job value rises, you've added cost in the upgrade that you haven't priced into the service.
Mobile detailing versus fixed location: how the numbers differ
Mobile detailing operators set Monthly Rent to zero and typically enter a lower overhead figure that covers vehicle costs, equipment maintenance, and water supply. Without rent, the breakeven job count drops significantly — but fuel and vehicle wear are real costs that need to be captured somewhere in the overhead line. A mobile operator averaging $400/month in fuel and vehicle maintenance at $800 total overhead still needs 20+ jobs per month to clear $1,000 in net profit.
Fixed-location shops have higher overhead but benefit from walk-in customers and the ability to run multiple vehicles simultaneously. If your shop can process 3 cars at once with two employees, your hourly revenue ceiling is triple what a mobile operator can produce. The trade-off is the fixed cost floor: your rent runs whether or not a car is on the lift. Run the numbers for both models before you sign anything — the comparison takes two minutes and the lease lasts years.
How to use it
- Enter Jobs Per Week — your real average across all five operating days, not your best week.
- Set Avg Labor Per Job and Avg Parts Per Job from your actual service menu and materials cost.
- Adjust the Parts Markup (%) slider to your standard markup on supplies and detail chemicals.
- Fill in Monthly Rent, Employee Wages, and Monthly Overhead from your actual expense ledger.
- Read Gross Revenue, Parts Margin, Net Profit, and Per Job Profit — then adjust jobs per week to find your breakeven volume.
Who it's for
- Solo mobile detailer evaluating whether to open a fixed location — Compares current $0 rent mobile model at 12 jobs/week against a hypothetical $1,200 rent studio — finds the fixed location needs 5 more jobs per week to match current net profit.
- Shop owner evaluating a first hire — Adds $2,800 in wages to the model and sees they need 8 additional jobs per week for the hire to pay for itself — uses this to set a minimum booking threshold before committing to the hire.
- Detailer adding ceramic coating packages to the menu — Raises average labor per job from $150 to $190 to reflect blended mix with ceramic services, increases avg parts per job to $55, sees per-job profit increase by $22 — confirms the upgrade tier is worth offering.
- Multi-location operator comparing two shops — Runs the calculator separately for each location with their respective job volumes and rent figures, identifying that Location B's higher rent isn't justified by its current job volume.
Key terms
- Parts markup
- The percentage added to the cost of supplies and materials when billing the customer. On a $30 supply kit at 50% markup, the customer is charged $45 and the shop retains $15 as gross margin.
- Per-job profit
- Net profit divided by total jobs — the average contribution to profit from completing one vehicle service. The clearest indicator of whether your pricing covers your cost structure at the job level.
- Gross margin
- Revenue minus the direct cost of delivering the service, before overhead is subtracted. For detailing, this is labor revenue plus parts markup revenue minus the actual cost of parts.
Frequently asked questions
Should tips be included in the average labor per job figure?
Tips are typically informal income and variable — best to leave them out of the model and treat them as above-projection upside. Base your average labor per job on the invoice amount, not including gratuity, for a conservative and reproducible revenue estimate.
What is a healthy parts markup for an auto detailing shop?
Most detail shops mark up consumable supplies 40-60%. Premium products like ceramic coatings and paint protection film, which carry higher customer price sensitivity, typically see 50-80% markup. The right number depends on local market pricing and whether customers are buying the product name or the application service.
How do I factor in equipment payments or lease costs?
Include monthly equipment payments in the Monthly Overhead input. If you're leasing a steam cleaner, extractor, or paint correction setup, add the monthly payment to overhead. If you're capitalizing the purchase, add a monthly depreciation equivalent.
What is a typical net profit margin for a detailing shop?
Well-run detail shops typically net 15-30% after labor and overhead. Higher margins come from premium service offerings with strong materials markup, lower labor cost relative to job value, and high volume to spread fixed overhead. Margins below 12% usually signal either underpriced services or excess labor cost.