Automotive
Repair Shop Bay Profitability Calculator
Estimate monthly automotive repair-shop profit, contribution per bay, and break-even bay utilization without treating parts sales as if every sales dollar were profit.
Available bay-hours-
Expected billed bay-hours-
Labor revenue-
Parts revenue-
Parts gross profit-
Direct technician cost-
Shop supplies cost-
Bay contribution before fixed overhead-
Monthly operating profit-
Operating profit per bay-
Break-even bay utilization-
Decision view
Bay loading, contribution, and break-even utilization
Bay loading, contribution, and break-even utilizationA live six-bay occupancy strip feeds a labor-and-parts contribution bridge and an exact utilization threshold.
Exact scenario comparisonBilled bay-hour utilization (%) changes while all other entered assumptions remain constant.
| Billed bay-hour utilization (%) | Available bay-hours | Expected billed bay-hours | Labor revenue | Parts revenue | Parts gross profit | Direct technician cost | Shop supplies cost | Bay contribution before fixed overhead | Monthly operating profit | Operating profit per bay | Break-even bay utilization |
|---|
How to use Repair Shop Bay Profitability Calculator
- Enter productive bays, working days, hours per day, and the share expected to be billed.
- Use the customer labor rate, parts sales per billed hour, and actual parts gross margin from the shop system.
- Enter technician, supply, and fixed overhead costs; compare current utilization with the break-even marker.
Calculator guide
Understanding Repair Shop Bay Profitability Calculator
A service bay earns money only when available clock hours become customer-billed hours. This calculator connects physical bay capacity to labor realization, parts gross profit, technician cost, shop supplies, fixed overhead, and the utilization needed to break even.
Detailed calculation process
Detailed repair-bay capacity and profit calculation
The default case models six productive bays, 22 working days, eight available hours per day, and 72% billed utilization.
General formula: H_a=BdhH_b=H_a uR_L=H_bLG_P=H_bPgC=R_L+G_P-H_b(T+S)profit=C-Fu_BE=F/[H_a(L+Pg-T-S)] Available bay-hours are reduced to billed hours by utilization. Labor revenue and the gross-profit portion of parts sales fund technician cost, supplies, and fixed overhead.
What each symbol means
Worked substitution with the default inputs
At the default inputs, modeled utilization is 39.16 percentage points above the 32.84% operating break-even level.
Worked situations
Practical examples
- Six bays operating 22 eight-hour days provide 1,056 bay-hours before utilization loss.
- At 72% utilization, the default shop bills 760.32 hours and produces $50,074.75 of modeled monthly operating profit.
Better inputs
Useful tips
- Use billed hours, not technician attendance hours, for utilization.
- Calculate parts margin from net parts sales after discounts, cores, and returns.
- Include service-advisor, rent, software, insurance, and nonproductive payroll in fixed overhead.
Before relying on the result
Limitations and common mistakes
- The model uses one blended labor rate and parts profile across all repair types.
- Comebacks, warranty work, technician efficiency bonuses, tax, depreciation, and owner compensation may require separate adjustments.
- Physical bay capacity does not guarantee technician or parts availability.
Reference
Key terms
- Bay-hour
- One service bay available for one operating hour.
- Billed-hour utilization
- Customer-billed bay-hours divided by physically available bay-hours.
- Parts gross profit
- Parts sales less parts acquisition cost, expressed here through the entered margin.
Important note
Use shop-management reports for realized billed hours and net parts margin. This is an operating estimate, not an accounting statement.
Frequently asked questions
Should diagnostic time be counted?
Count it when it is included in customer-billed labor hours; unpaid diagnosis consumes capacity without revenue.
Why is technician cost charged per billed hour?
It creates a contribution view aligned with billed production; convert payroll to a loaded billed-hour cost using recent actuals.
Can profit per bay guide expansion?
It is a screening metric only; a new bay may also require a technician, lift, tools, permits, and incremental supervision.