Index
Why KPIs are decision tools, not control tools
KPI 1: Average days in stock
KPI 2: Average gross margin per vehicle
KPI 3: Average net margin per vehicle
KPI 4: Lead conversion rate
KPI 5: Cost per lead by channel
KPI 6: Average reconditioning cost
KPI 7: Percentage of sales with financing
KPI 8: Additional revenue per operation
KPI 9: NPS or average Google rating
How to review KPIs without wasting time
Frequently asked questions
Why KPIs are decision tools, not control tools
The goal of measuring KPIs is not to have a nice-looking dashboard: it is to make better decisions. A dealership that knows its average days in stock has risen from 45 to 68 days in two months can act before the problem impacts cash flow. One that does not measure it discovers the problem when it has already spent weeks failing to sell at the margins it needs.
The KPIs proposed here are not an exhaustive list: they are the ones that have the greatest impact on the profitability of a used vehicle dealership and those that generate the most actionable information. There is no need to measure them all from day one. Starting with the three or four most critical to the current business situation and progressively adding the others is more effective than trying to control everything at once.
KPI 1: Average days in stock
What it measures. The average number of days that elapse between a vehicle entering stock and being sold.
How to calculate it.
Sum of days in stock of all vehicles sold in the period ÷ Number of vehicles sold
Industry benchmark. Between 30 and 60 days is the usual range for used car dealerships in Spain. Below 30 may indicate prices that are too low. Above 60, the cost of capital starts to significantly erode the net margin.
How to segment it to make it useful. The general average can hide problems in specific segments. Calculate it also by price bracket (under £8,000, £8,000-£15,000, over £15,000) and by vehicle type. If compact cars rotate in 25 days but SUVs take 85, there is a specific pricing or demand issue in that segment.
What to do if it goes up. Review the pricing of cars with the most days in stock, verify that the listings have quality photos and complete descriptions, and assess whether the profile of those vehicles has real demand in the area. To understand which actions have the greatest impact on turnover, you can review the guide on how to reduce used stock turn time.
KPI 2: Average gross margin per vehicle
What it measures. The average difference between the sale price and the purchase price plus the direct costs of the operation (preparation, listing, transfer), before VAT is deducted.
How to calculate it.
(Sale price − Purchase price − Direct costs of the operation) ÷ Number of vehicles sold
Industry benchmark. In used car dealerships in Spain, an average gross margin of between 10% and 18% on the sale price is a healthy range. Below 10%, the business struggles to cover fixed costs and generate net profit.
What to do if it drops. Identify whether the problem is in the purchase (paying too much), in the preparation (reconditioning costs have skyrocketed), or in the sale (selling with too much discount). Each cause has a different action lever.
KPI 3: Average net margin per vehicle
What it measures. The actual profit per operation after extracting VAT (under REBU, VAT is included within the gross margin).
How to calculate it under REBU.
Taxable base = Gross margin ÷ 1.21 Net margin = Gross margin − (Gross margin − Taxable base)
In other words: Gross margin ÷ 1.21.
Why it is different from the gross margin. In REBU operations, the VAT calculated on the margin reduces the real profit by between 15% and 17% of the gross margin. A dealership working with an average gross margin of €1,800 is generating a real net margin of approximately €1,487 per operation, not €1,800.
What to do if it is insufficient. The net margin per operation must cover the fixed costs of the business plus the target profit. If the average net margin multiplied by the number of monthly operations does not cover the fixed costs, the business operates at a loss even if the gross margin looks positive. For leverage to improve the margin, you can review the guide on how to improve profit margins in a dealership.
KPI 4: Lead conversion rate
What it measures. The percentage of leads (qualified enquiries) that convert into a sale.
How to calculate it.
(Number of sales ÷ Number of leads received) × 100
Industry benchmark. A conversion rate of between 15% and 25% is common in well-managed used car dealerships. Below 10%, there is a serious problem in the lead follow-up process or in the quality of the leads.
How to segment it. The conversion rate varies significantly by source channel (portal leads vs own website leads vs social media leads) and by vehicle profile. A lead asking about a £5,000 car has a different decision profile than one asking about an £18,000 car.
What to do if it is low. Measure the response time to first contacts (the factor with the greatest impact on conversion), review the follow-up process for leads that didn't close on the first visit, and check whether incoming leads are properly qualified or if the channel is generating low-intent enquiries.
KPI 5: Cost per lead by channel
What it measures. How much it costs to generate each qualified lead in each marketing channel.
How to calculate it.
Spend on the channel ÷ Number of leads generated by that channel
Why it matters. A lead from a portal might cost £8 and one from Google Ads might cost £35. If the conversion rate of both is similar, the channel with the lower cost per lead is more efficient. But if the Google Ads one converts at double the rate, the cost per sale may be comparable. The relevant KPI is not just the cost per lead, but the cost per closed sale.
What to do with the data. Reallocate the marketing budget towards the channels with the lowest cost per sale. Pause or reduce investment in channels with high cost per lead and low conversion rates.
KPI 6: Average reconditioning cost
What it measures. The average expenditure on preparing each vehicle before putting it up for sale.
How to calculate it.
Sum of all preparation expenses (workshop, cleaning, photography, MOT) ÷ Number of vehicles prepared
Industry benchmark. A reasonable reconditioning cost varies by price bracket: between 3% and 6% of the sale price is a common range. For a £10,000 car, between £300 and £600. Above 8-10% of the sale price, reconditioning is destroying margin.
How to segment it. By type of intervention (mechanical, bodywork, cleaning) and by supplier. If a specific workshop represents 60% of the total reconditioning cost, it is worth negotiating volume terms or looking for alternatives.
To see which interventions offer the best return and which destroy margin, you can review the guide on how to recondition a car for sale.
KPI 7: Percentage of sales with financing
What it measures. What proportion of total sales are closed with finance arranged through the dealership.
How to calculate it.
(Sales with financing ÷ Total sales) × 100
Industry benchmark. In well-managed used car dealerships that actively promote financing, a percentage of 30-50% is achievable. Below 15%, either it is not being offered systematically or there are barriers in the approval process.
Why it matters. Each sale with finance generates an additional commission from the finance company (between £200 and £600 depending on the amount and the agreement). A dealership that finances 40% of its 15 monthly sales with an average commission of £350 generates £2,100 extra per month with no additional acquisition cost.
To see how to increase the percentage of financed sales, you can consult the guide on how to sell more finance packages in your dealership.
KPI 8: Additional revenue per operation
What it measures. The average revenue per sale that comes from services other than the vehicle price: finance commissions, warranties, insurance, transfer management.
How to calculate it.
Sum of all additional revenue in the period ÷ Number of sales in the period
Why it matters. A dealership with an average additional revenue of £400 per operation has a very different financial structure from one with £50 per operation, even if the gross margin of the vehicle is identical. Additional revenue is the area with the greatest leverage for improvement for most dealerships because it is underutilised.
KPI 9: NPS or average Google rating
What it measures. Customer satisfaction and the online reputation of the business.
How to calculate it. The average rating on Google Business Profile (out of 5) and the number of recent reviews (last 90 days) are the most direct metrics. NPS (Net Promoter Score) requires a specific post-sale survey but is the most precise indicator of loyalty and recommendation.
Industry benchmark. An average rating above 4.5 with more than 50 reviews is a competitive profile in the local market. Below 4.0, there are reputation issues that impact the contact rate of potential buyers.
What to do if it is low. Review the delivery and after-sales process (the two moments that generate the most negative reviews), implement a systematic process for requesting reviews after each delivery, and respond constructively and quickly to all negative reviews. To see how to manage reviews systematically, you can consult the guide on how to get and manage Google reviews in your dealership.
How to review KPIs without wasting time
Reviewing KPIs only adds value if it is done regularly and leads to concrete actions. The most efficient format for a medium-sized dealership is:
Weekly review (15 minutes): days in stock per car, leads received and response rate in under 2 hours, sales closed during the week.
Monthly review (30-45 minutes): all KPIs on the list compared to the previous month. Identify the two or three indicators that have changed the most and define a concrete action for each.
Quarterly review (1 hour): trends over the last three months, comparison with industry benchmarks, review of objectives and adjustments if necessary.
The tool is not the most important thing: what matters is the frequency and the willingness to act on the data. An Excel sheet updated weekly with the nine KPIs on this list provides more useful information than a sophisticated dashboard that nobody looks at.
More than 750 dealerships already use Dealcar to manage their daily operations
Dealcar automatically calculates the main operational KPIs (days in stock, gross and net margin per vehicle, reconditioning cost, percentage of sales with finance) from the data of each operation. Without extra manual work, the panel shows in real time how the business is evolving and where the areas for improvement are.
If you want to see how it works, visit dealcar.io/software-concesionario or book a free demo at dealcar.io.
Frequently asked questions
How many KPIs should a small dealership measure?
Start with three: average days in stock, average gross margin per vehicle, and lead conversion rate. These are the ones that most directly impact profitability and are the easiest to calculate with available data. Add the others progressively as the review process becomes established.
How often should KPIs be reviewed?
Operational ones (days in stock, leads) weekly. Financial ones (margin, additional revenue) monthly. Reputation ones (Google rating) monthly. The key is consistency, not frequency.
Should gross margin and net margin be the same indicator?
No. Gross margin includes REBU VAT which is not business income. Net margin reflects actual profit. To make correct financial decisions, you must always work with the net margin.
How do I know if my KPIs are good or bad?
By comparing them with the industry benchmarks indicated for each KPI in this guide, and by comparing them with your own historical data. The trend (whether a KPI is improving or worsening compared to the previous month) matters just as much as the absolute value.
