Index
Why KPIs are decision tools, not control tools
KPI 1: Average stock time
KPI 2: Average gross margin per vehicle
KPI 3: Average net margin per vehicle
KPI 4: Lead conversion rate
KPI 5: Lead acquisition cost per channel
KPI 6: Average reconditioning cost
KPI 7: Percentage of sales with finance
KPI 8: Additional income per transaction
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 pretty dashboard: it is to make better decisions. A dealership that knows its average stock time 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 they have already gone weeks without selling at the margins they need.
The KPIs proposed here are not an exhaustive list: they are the ones that have the greatest impact on the profitability of a used car business 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 adding the others progressively is more effective than trying to control everything at once.
KPI 1: Average stock time
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 standard range in Spanish used vehicle businesses. Below 30 may indicate prices 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 range (less than €8,000, €8,000-€15,000, over €15,000) and by vehicle type. If city 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 more days in stock, check that the listings have high-quality photos and full 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 check the guide on how to reduce used stock rotation time.
KPI 2: Average gross margin per vehicle
What it measures. The average difference between the selling price and the purchase price plus the direct costs of the operation (preparation, listing, transfer), before VAT is deducted.
How to calculate it.
(Selling price − Purchase price − Direct transaction costs) ÷ Number of vehicles sold
Industry benchmark. In Spanish used vehicle businesses, 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 if the problem is in the purchasing (paying too much), in prep (reconditioning costs have skyrocketed), or in the sale (selling with too much discount). Each cause has a different line of action.
KPI 3: Average net margin per vehicle
What it measures. The real profit per transaction after extracting VAT (under REBU, VAT is included within the gross margin).
How to calculate under REBU.
Taxable base = Gross margin ÷ 1.21 Net margin = Gross margin − (Gross margin − Taxable base)
Namely: Gross margin ÷ 1.21.
Why it is different from gross margin. In REBU operations, VAT calculated on the margin reduces real profit by between 15% and 17% of the gross margin. A dealership operating with an average gross margin of €1,800 is generating a real net margin of approximately €1,487 per transaction, not €1,800.
What to do if it is insufficient. The net margin per transaction must cover the fixed costs of the business plus the target profit. If the average net margin multiplied by the number of monthly transactions does not cover fixed costs, the business operates at a loss even if the gross margin looks positive. For methods to improve margin, you can check the guide on how to improve profit margins in a dealership.
KPI 4: Lead conversion rate
What it measures. The percentage of leads (qualified inquiries) that turn into sales.
How to calculate it.
(Number of sales ÷ Number of leads received) × 100
Industry benchmark. A conversion rate of between 15% and 25% is standard 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 themselves.
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 inquiring about a €5,000 car has a different decision-making profile than one inquiring about an €18,000 car.
What to do if it is low. Measure response times to first contact (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 if the incoming leads are qualified correctly or if the channel is generating low-intent inquiries.
KPI 5: Lead acquisition cost per 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 Coches.net might cost €8 and one from Google Ads might cost €35. If the conversion rate for 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 marketing budget to 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 spend on preparing each vehicle before putting it up for sale.
How to calculate it.
Sum of all prep expenses (workshop, cleaning, photography, MOT) ÷ Number of vehicles prepared
Industry benchmark. A reasonable reconditioning cost varies by price tier: between 3% and 6% of the sale price is a standard range. For a €10,000 car, between €300 and €600. Above 8-10% of the sale price, reconditioning is eroding margins.
How to segment it. By type of job (mechanical, bodywork, cleaning) and by supplier. If a specific garage accounts for 60% of total reconditioning costs, it is worth negotiating volume rates or seeking alternatives.
To see which prep work yields the best return and which erodes margins, you can check the guide on how to prep a car for sale.
KPI 7: Percentage of sales with finance
What it measures. What proportion of total sales are closed with finance through the dealership.
How to calculate it.
(Sales with finance ÷ Total sales) × 100
Industry benchmark. In well-managed used vehicle businesses actively offering finance, a percentage of 30-50% is achievable. Below 15%, either it is not being offered systematically, or there are friction points 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 an extra €2,100 per month with no extra acquisition cost.
To see how to increase the percentage of financed sales, you can refer to the guide on how to sell more finance at your dealership.
KPI 8: Additional income per transaction
What it measures. The average revenue per sale that comes from services other than the vehicle price: finance commissions, warranties, insurance, transfer handling.
How to calculate it.
Sum of all additional income in the period ÷ Number of sales in the period
Why it matters. A dealership with an average additional income of €400 per transaction has a very different financial structure to one with €50 per transaction, even if the vehicle's gross margin is identical. Additional income is the area with the greatest margin 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 it is the most accurate 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 problems that impact the contact rate of potential buyers.
What to do if it is low. Review the delivery and after-sales processes (the two stages that generate the most negative reviews), implement a systematic process for requesting reviews after each delivery, and respond professionally and quickly to all negative reviews. To see how to manage reviews systematically, you can check the guide on how to get and manage Google reviews for your dealership.
How to review KPIs without wasting time
Reviewing KPIs only adds value if done regularly and if it leads to concrete actions. The most efficient frequency for a mid-sized used car business is:
Weekly review (15 minutes): stock time 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 metrics that shifted the most and define a specific action for each.
Quarterly review (1 hour): trends over the last three months, comparison against industry benchmarks, review of goals and adjustments if necessary.
The tool used is not the most important thing: what matters is the routine and the willingness to act on the data. An Excel spreadsheet updated weekly with the nine KPIs on this list provides more useful insights than a sophisticated dashboard that nobody looks at.
Over 750 used car dealerships already use Dealcar to manage their daily operations
Dealcar automatically calculates key operational KPIs (stock time, gross and net margin per vehicle, reconditioning cost, percentage of sales with finance) from the data of each transaction. Without any manual work, the dashboard shows in real-time how the business is evolving and where the areas for improvement are.
If you want to see how it works, you can book a free demo at dealcar.io.
Frequently Asked Questions
How many KPIs should a small dealership measure?
Start with three: average stock time, 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 (stock time, leads) weekly. Financial ones (margin, additional income) 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 part of the business's income. Net margin reflects real profit. To make correct financial decisions, you should always work with the net margin.
How do I know if my KPIs are good or bad?
By comparing them with the industry benchmarks provided for each KPI in this guide, and by comparing them with your own historical data. The trend (whether a KPI improves or worsens compared to the previous month) matters just as much as the absolute figure.
Index
Why KPIs are decision tools, not control tools
KPI 1: Average stock time
KPI 2: Average gross margin per vehicle
KPI 3: Average net margin per vehicle
KPI 4: Lead conversion rate
KPI 5: Lead acquisition cost per channel
KPI 6: Average reconditioning cost
KPI 7: Percentage of sales with finance
KPI 8: Additional income per transaction
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 pretty dashboard: it is to make better decisions. A dealership that knows its average stock time 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 they have already gone weeks without selling at the margins they need.
The KPIs proposed here are not an exhaustive list: they are the ones that have the greatest impact on the profitability of a used car business 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 adding the others progressively is more effective than trying to control everything at once.
KPI 1: Average stock time
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 standard range in Spanish used vehicle businesses. Below 30 may indicate prices 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 range (less than €8,000, €8,000-€15,000, over €15,000) and by vehicle type. If city 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 more days in stock, check that the listings have high-quality photos and full 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 check the guide on how to reduce used stock rotation time.
KPI 2: Average gross margin per vehicle
What it measures. The average difference between the selling price and the purchase price plus the direct costs of the operation (preparation, listing, transfer), before VAT is deducted.
How to calculate it.
(Selling price − Purchase price − Direct transaction costs) ÷ Number of vehicles sold
Industry benchmark. In Spanish used vehicle businesses, 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 if the problem is in the purchasing (paying too much), in prep (reconditioning costs have skyrocketed), or in the sale (selling with too much discount). Each cause has a different line of action.
KPI 3: Average net margin per vehicle
What it measures. The real profit per transaction after extracting VAT (under REBU, VAT is included within the gross margin).
How to calculate under REBU.
Taxable base = Gross margin ÷ 1.21 Net margin = Gross margin − (Gross margin − Taxable base)
Namely: Gross margin ÷ 1.21.
Why it is different from gross margin. In REBU operations, VAT calculated on the margin reduces real profit by between 15% and 17% of the gross margin. A dealership operating with an average gross margin of €1,800 is generating a real net margin of approximately €1,487 per transaction, not €1,800.
What to do if it is insufficient. The net margin per transaction must cover the fixed costs of the business plus the target profit. If the average net margin multiplied by the number of monthly transactions does not cover fixed costs, the business operates at a loss even if the gross margin looks positive. For methods to improve margin, you can check the guide on how to improve profit margins in a dealership.
KPI 4: Lead conversion rate
What it measures. The percentage of leads (qualified inquiries) that turn into sales.
How to calculate it.
(Number of sales ÷ Number of leads received) × 100
Industry benchmark. A conversion rate of between 15% and 25% is standard 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 themselves.
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 inquiring about a €5,000 car has a different decision-making profile than one inquiring about an €18,000 car.
What to do if it is low. Measure response times to first contact (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 if the incoming leads are qualified correctly or if the channel is generating low-intent inquiries.
KPI 5: Lead acquisition cost per 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 Coches.net might cost €8 and one from Google Ads might cost €35. If the conversion rate for 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 marketing budget to 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 spend on preparing each vehicle before putting it up for sale.
How to calculate it.
Sum of all prep expenses (workshop, cleaning, photography, MOT) ÷ Number of vehicles prepared
Industry benchmark. A reasonable reconditioning cost varies by price tier: between 3% and 6% of the sale price is a standard range. For a €10,000 car, between €300 and €600. Above 8-10% of the sale price, reconditioning is eroding margins.
How to segment it. By type of job (mechanical, bodywork, cleaning) and by supplier. If a specific garage accounts for 60% of total reconditioning costs, it is worth negotiating volume rates or seeking alternatives.
To see which prep work yields the best return and which erodes margins, you can check the guide on how to prep a car for sale.
KPI 7: Percentage of sales with finance
What it measures. What proportion of total sales are closed with finance through the dealership.
How to calculate it.
(Sales with finance ÷ Total sales) × 100
Industry benchmark. In well-managed used vehicle businesses actively offering finance, a percentage of 30-50% is achievable. Below 15%, either it is not being offered systematically, or there are friction points 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 an extra €2,100 per month with no extra acquisition cost.
To see how to increase the percentage of financed sales, you can refer to the guide on how to sell more finance at your dealership.
KPI 8: Additional income per transaction
What it measures. The average revenue per sale that comes from services other than the vehicle price: finance commissions, warranties, insurance, transfer handling.
How to calculate it.
Sum of all additional income in the period ÷ Number of sales in the period
Why it matters. A dealership with an average additional income of €400 per transaction has a very different financial structure to one with €50 per transaction, even if the vehicle's gross margin is identical. Additional income is the area with the greatest margin 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 it is the most accurate 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 problems that impact the contact rate of potential buyers.
What to do if it is low. Review the delivery and after-sales processes (the two stages that generate the most negative reviews), implement a systematic process for requesting reviews after each delivery, and respond professionally and quickly to all negative reviews. To see how to manage reviews systematically, you can check the guide on how to get and manage Google reviews for your dealership.
How to review KPIs without wasting time
Reviewing KPIs only adds value if done regularly and if it leads to concrete actions. The most efficient frequency for a mid-sized used car business is:
Weekly review (15 minutes): stock time 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 metrics that shifted the most and define a specific action for each.
Quarterly review (1 hour): trends over the last three months, comparison against industry benchmarks, review of goals and adjustments if necessary.
The tool used is not the most important thing: what matters is the routine and the willingness to act on the data. An Excel spreadsheet updated weekly with the nine KPIs on this list provides more useful insights than a sophisticated dashboard that nobody looks at.
Over 750 used car dealerships already use Dealcar to manage their daily operations
Dealcar automatically calculates key operational KPIs (stock time, gross and net margin per vehicle, reconditioning cost, percentage of sales with finance) from the data of each transaction. Without any manual work, the dashboard shows in real-time how the business is evolving and where the areas for improvement are.
If you want to see how it works, you can book a free demo at dealcar.io.
Frequently Asked Questions
How many KPIs should a small dealership measure?
Start with three: average stock time, 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 (stock time, leads) weekly. Financial ones (margin, additional income) 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 part of the business's income. Net margin reflects real profit. To make correct financial decisions, you should always work with the net margin.
How do I know if my KPIs are good or bad?
By comparing them with the industry benchmarks provided for each KPI in this guide, and by comparing them with your own historical data. The trend (whether a KPI improves or worsens compared to the previous month) matters just as much as the absolute figure.
