The 8 KPIs Every Auto Body Shop Should Track

Revenue and car count are the metrics most shop owners check first — and for good reason. They are the most visible indicators of business activity. But they are also the most misleading, because a shop can be busy and unprofitable, or slow and highly profitable, depending on the metrics beneath the surface. The eight KPIs below are the ones that consistently separate high-performing shops from average ones. Each one is measurable with data you already have, and each one points directly to a specific lever for improvement.

1. Gross Profit Per Repair Order

Gross profit per repair order — revenue minus direct costs (parts, materials, sublet, and direct labor) divided by the number of repair orders — is the single most important profitability metric for a collision shop. It tells you whether you are making money on the work you are doing, independent of how much work you are doing. A shop writing 80 repair orders per month at $800 gross profit each is more profitable than one writing 120 at $400 each — and the first shop has more capacity available for higher-value work.

Target gross profit per repair order varies by market and shop type, but a well-run independent shop should be achieving $900 to $1,400 per repair order. Shops consistently below $700 have a pricing, efficiency, or parts-sourcing problem that volume alone will not solve.

2. Supplement Rate

Supplement rate — the percentage of repair orders that require at least one supplement — is a direct measure of estimate quality. A high supplement rate (above 40%) indicates that initial estimates are consistently missing damage, which creates delays, customer dissatisfaction, and administrative overhead. A very low supplement rate (below 10%) may indicate that estimators are over-writing initial estimates to avoid supplements, which creates its own problems with carrier relationships.

The target supplement rate for a well-run shop using modern estimating tools is 15% to 25%. Shops above 40% should audit their estimating process — specifically whether estimators are performing adequate initial inspections and whether teardown is being completed before the estimate is finalized.

3. Cycle Time by Phase

As discussed in our cycle time guide, tracking total cycle time is less useful than tracking cycle time by phase: parts wait, approval wait, production time, and sublet wait. Each phase has a different driver and a different solution. Shops that track cycle time by phase can identify their specific bottleneck and target their improvement efforts precisely.

4. Parts Gross Profit Percentage

Parts gross profit — the margin between what you charge for parts and what you pay for them — is one of the most variable and most controllable elements of shop profitability. OEM parts typically carry a list price markup of 20% to 30%. Aftermarket parts can carry higher margins but introduce quality and liability considerations. Parts gross profit percentage should be tracked separately for OEM, aftermarket, and recycled parts to identify where margin is being lost.

Shops that allow adjusters to dictate parts sourcing without pushback frequently find their parts gross profit eroding over time. Knowing your parts margin by category — and having a clear policy on when you will and will not accept parts substitutions — is essential to protecting this revenue stream.

5. Customer Satisfaction Index (CSI) Score

CSI scores — typically collected through carrier-administered surveys or third-party platforms — are the most visible quality metric in the industry. Carriers use them to evaluate DRP shop performance, and customers increasingly consult online reviews before choosing a shop. A CSI score below 4.5 out of 5.0 is a warning sign that warrants investigation. The most common drivers of low CSI scores are: delivery time longer than promised, vehicle not fully cleaned at delivery, communication failures during the repair, and quality issues discovered after delivery.

6. Technician Efficiency

Technician efficiency — the ratio of billed hours to clock hours — measures how productively your technicians are working relative to the time they are in the shop. An efficiency rate of 120% means a technician is producing 1.2 hours of billed work for every clock hour worked, which is a reasonable target for experienced body technicians. Efficiency below 90% indicates a workflow problem — technicians are spending significant time waiting for parts, waiting for assignments, or performing non-billable work.

7. Accounts Receivable Days

Accounts receivable days — the average number of days between completing a repair and receiving payment — is a cash flow metric that many shops underweight. A shop with strong revenue but slow collections can find itself cash-constrained even in a busy period. Carrier payment terms vary, but most should be paying within 30 days of invoice submission. Shops with AR days above 45 should audit their invoicing process for errors or delays that are holding up payment.

8. Estimate-to-Repair Conversion Rate

Conversion rate — the percentage of estimates written that result in a completed repair — measures how effectively your shop is winning the work it estimates. A conversion rate below 60% indicates that either your pricing is uncompetitive, your customer communication is weak, or you are writing estimates for vehicles that are unlikely to be repaired (total losses, minor damage that customers choose not to repair). Understanding why estimates are not converting is as important as understanding why they are.