Table of Contents
What are days in stock and why they matter more than sales volume
How they are calculated: the formula and a step-by-step example
What is a reasonable threshold by segment
How to interpret the indicator by vehicle type
What to do when days in stock go up
Days in stock and real financing cost: the calculation that many overlook
Dealcar and real-time days-in-stock control
Frequently asked questions
What are days in stock and why they matter more than sales volume
Days in stock measure the average time a vehicle remains in a dealership's inventory from the moment it enters until the sale is signed. It is an efficiency indicator: the lower the days, the faster the capital rotates and the less cost each vehicle accumulates.
A dealership can sell 30 cars a month and have a business with financial problems if those cars take an average of 90 days to leave. Another that sells 15 cars a month but with a turnover of 25 days may have more liquidity and a higher net margin. Sales volume does not tell the whole story. Days in stock do.
The metric connects directly with three critical business variables: the cost of financing inventory (if you have stock finance, every day has a cost), market depreciation (a car that does not rotate can lose value while stationary), and the ability to reinvest capital in new purchases.
Read the full breakdown of the real cost of a stationary car in stock.
How they are calculated: the formula and a step-by-step example
There are two ways to calculate it, depending on whether you want data for a specific vehicle or the average for the dealership.
For a specific vehicle: Days in stock = Date of sale (or today's date if still unsold) minus the date of entry into inventory.
A Golf that came in on 1 April and sold on 28 April has been in stock for 27 days.
For the dealership average (monthly period):
Average days in stock = Sum of the days in stock of all vehicles sold in the period / Number of vehicles sold in that period.
Specific example: in May you sold 12 cars. The days in stock for each were: 18, 34, 22, 45, 12, 67, 29, 41, 15, 38, 53, 24. Total sum: 398 days. Average: 398 / 12 = 33 days.
This means that, on average, each car sold in May was in your inventory for 33 days before leaving. It is a useful number to compare with previous months and with the threshold you have set for yourself.
Read what KPIs a dealership should measure to control its business.
You can also calculate the days in stock of the live inventory, that is, of the cars that have not yet been sold. In this case, the reference date is today, not the date of sale. This number tells you how many days each car has been stationary at this moment and which ones need urgent attention.
What is a reasonable threshold by segment
There is no single valid number for all dealerships. The reasonable threshold varies depending on the price segment and the type of vehicle.
Segment | Reasonable days in stock | Alert signal |
|---|---|---|
City cars up to £5,000 | Less than 20 days | More than 35 days |
Saloons and SUVs £5,000-£15,000 | 20-40 days | More than 55 days |
Premium vehicles £15,000-£30,000 | 30-60 days | More than 75 days |
Luxury vehicles over £30,000 | 45-90 days | More than 120 days |
Used electric vehicles | 25-50 days | More than 70 days |
These ranges assume reasonable listing operations and prices adjusted to the market. A car that enters stock on a Monday and is not advertised until the following Thursday is already 3 days behind without generating any contact.
The threshold you must set for yourself as a dealership is the one that makes the operation profitable. If you have stock finance at 7% per annum and an average net margin of £1,600 per car, the maximum financing cost per vehicle you can absorb without destroying the margin gives you your personalised threshold of days in stock.
How to interpret the indicator by vehicle type
Days in stock are not interpreted the same way for all vehicles in inventory. A distinction must be made between what is normal for that type of car and what is a sign of a problem.
A budget city car that has been unsold for 40 days is a clear sign: either the price is high or there is a presentation issue. This type of car sells quickly if the price is right. If it hasn't sold in 40 days, something is wrong.
A premium SUV worth £22,000 that has been in stock for 45 days can be within normal limits: buyers in that segment take longer to decide, compare more options, and sometimes need to manage financing before committing.
A luxury vehicle worth £45,000 that has been in stock for 90 days can be perfectly normal, or it can be a sign that the price is out of step with the market. In that segment, the difference between a correct price and one that is 5% too high can mean weeks of difference in turnover.
That is why the analysis of days in stock must always be done in context: comparing with the history of the same type of vehicle in your dealership, not applying a single metric to the entire inventory.
See also how Euro 7 regulations and LEZs affect used stock.
What to do when days in stock go up
When your average days in stock for the month exceeds your usual threshold, there are four levers of action sorted by cost and speed of impact.
Price adjustment. This is the most direct lever. A car that has been unsold for 45 days and is at market price probably needs a reduction of between 3% and 7% to generate interest again. A car at £12,000 that drops to £11,500 can go from having no interest to having several potential buyers in a few days.
See how to reduce days in stock with dynamic pricing.
Greater visibility on portals. Featuring the advert, updating photos, or expanding the description. Many portals prioritise newer adverts or those with more interactions in their results. An advert that has been published for 40 days without being touched has lost visibility compared to new listings.
Change of channel. If the car has been published on the same portals for weeks without response, it may have more reach on a different channel. A niche vehicle (sports car, SUV, van) might have more demand in specialized portals or Facebook groups than in generalist portals.
Review of the buying strategy. If several cars of the same type have been sitting for a long time, the problem may not be the sale, but the purchase. You may have bought a vehicle profile that does not roll over well in your area or in your usual price range. This analysis prevents repeating the same mistake on the next purchase.
Days in stock and real financing cost: the calculation that many overlook
If you have a stock finance line, every day that a car is in inventory has a direct cost that accumulates silently and that many dealerships do not include in the calculation of the real margin of each operation.
Also read what stock finance is and how it works for dealerships.
The calculation is simple. If the purchase value of the vehicle is £10,000 and your stock finance interest rate is 7% per annum, the daily financing cost is: 10,000 x 0.07 / 365 = £1.92 a day.
If that car takes 80 days to sell, the accumulated financing cost is £153. If it takes 30 days, it is £57. The difference of 50 days means a £96 lower net margin on that operation.
On a larger scale, with 20 cars in stock with an average value of £10,000 and a difference of 20 days in average turnover, the difference in financing costs is approximately £767 per month. This money does not appear explicitly on any invoice, but it comes out of the margin of each vehicle.
That is why reducing days in stock is not just a matter of operational efficiency: it is a direct lever on business profitability.
Dealcar and real-time days-in-stock control
Dealcar automatically records the entry-to-stock date of each vehicle and calculates the days in inventory in real time. From the dashboard, you can see at a glance which cars are above your usual threshold and act before the stocking cost eats into the margin.
The system also allows you to calculate the average days in stock by period, by type of vehicle, and by sales channel, which facilitates the analysis of what is and isn't working in your turnover process. If you want to see how it works, request a demo at dealcar.io.
Frequently asked questions
Are days in stock counted from when I dynamic buy the car or from when I advertise it?
From when the car enters your inventory, which usually coincides with the purchase date or vehicle collection date. Advertising it later does not "stop the clock": financing costs and depreciation start from the moment the vehicle is yours. That is why preparing and listing the car as soon as possible is part of turnover management.
Does it make sense to calculate days in stock for cars that haven't been sold yet?
Yes, and it is especially useful. Knowing that you have 4 cars that have been in stock for over 60 days gives you actionable information: you can act on those specific vehicles before the problem worsens. Do not wait for the end of the month to review turnover: do it weekly with the live inventory.
How do days in stock affect the calculation of the real margin?
The gross margin (selling price minus purchase price) does not include the cost of days in stock. The net margin must include it: selling price minus purchase price minus preparation minus administrative fees minus financing cost proportional to the days in stock. A car with a £2,000 gross margin and 90 days in stock with 7% financing has a real net margin that is £300 to £500 lower, depending on the purchase value.
What happens if a car has been in stock for more than 90 days and there is no buyer?
At a certain point, the price must be lowered enough to unload it, even with a minimal margin. A car that has been in stock for 120 days is generating costs every day and occupying space that could be taken by a vehicle with faster turnover. Keeping it in the hope of finding a buyer at the original price is usually a mistake: the opportunity cost of that tied-up capital usually exceeds the price difference you are trying to recover.
Do days in stock affect the valuation of the dealership if I want to sell it?
Yes. A buyer or investor analysing a dealership looks at average stock turnover as an indicator of operational efficiency. High and consistent turnover is a sign of a well-run business. Stock with many cars sitting for over 60 days indicates buying or selling problems that the buyer will have to resolve.
Table of Contents
What are days in stock and why they matter more than sales volume
How they are calculated: the formula and a step-by-step example
What is a reasonable threshold by segment
How to interpret the indicator by vehicle type
What to do when days in stock go up
Days in stock and real financing cost: the calculation that many overlook
Dealcar and real-time days-in-stock control
Frequently asked questions
What are days in stock and why they matter more than sales volume
Days in stock measure the average time a vehicle remains in a dealership's inventory from the moment it enters until the sale is signed. It is an efficiency indicator: the lower the days, the faster the capital rotates and the less cost each vehicle accumulates.
A dealership can sell 30 cars a month and have a business with financial problems if those cars take an average of 90 days to leave. Another that sells 15 cars a month but with a turnover of 25 days may have more liquidity and a higher net margin. Sales volume does not tell the whole story. Days in stock do.
The metric connects directly with three critical business variables: the cost of financing inventory (if you have stock finance, every day has a cost), market depreciation (a car that does not rotate can lose value while stationary), and the ability to reinvest capital in new purchases.
Read the full breakdown of the real cost of a stationary car in stock.
How they are calculated: the formula and a step-by-step example
There are two ways to calculate it, depending on whether you want data for a specific vehicle or the average for the dealership.
For a specific vehicle: Days in stock = Date of sale (or today's date if still unsold) minus the date of entry into inventory.
A Golf that came in on 1 April and sold on 28 April has been in stock for 27 days.
For the dealership average (monthly period):
Average days in stock = Sum of the days in stock of all vehicles sold in the period / Number of vehicles sold in that period.
Specific example: in May you sold 12 cars. The days in stock for each were: 18, 34, 22, 45, 12, 67, 29, 41, 15, 38, 53, 24. Total sum: 398 days. Average: 398 / 12 = 33 days.
This means that, on average, each car sold in May was in your inventory for 33 days before leaving. It is a useful number to compare with previous months and with the threshold you have set for yourself.
Read what KPIs a dealership should measure to control its business.
You can also calculate the days in stock of the live inventory, that is, of the cars that have not yet been sold. In this case, the reference date is today, not the date of sale. This number tells you how many days each car has been stationary at this moment and which ones need urgent attention.
What is a reasonable threshold by segment
There is no single valid number for all dealerships. The reasonable threshold varies depending on the price segment and the type of vehicle.
Segment | Reasonable days in stock | Alert signal |
|---|---|---|
City cars up to £5,000 | Less than 20 days | More than 35 days |
Saloons and SUVs £5,000-£15,000 | 20-40 days | More than 55 days |
Premium vehicles £15,000-£30,000 | 30-60 days | More than 75 days |
Luxury vehicles over £30,000 | 45-90 days | More than 120 days |
Used electric vehicles | 25-50 days | More than 70 days |
These ranges assume reasonable listing operations and prices adjusted to the market. A car that enters stock on a Monday and is not advertised until the following Thursday is already 3 days behind without generating any contact.
The threshold you must set for yourself as a dealership is the one that makes the operation profitable. If you have stock finance at 7% per annum and an average net margin of £1,600 per car, the maximum financing cost per vehicle you can absorb without destroying the margin gives you your personalised threshold of days in stock.
How to interpret the indicator by vehicle type
Days in stock are not interpreted the same way for all vehicles in inventory. A distinction must be made between what is normal for that type of car and what is a sign of a problem.
A budget city car that has been unsold for 40 days is a clear sign: either the price is high or there is a presentation issue. This type of car sells quickly if the price is right. If it hasn't sold in 40 days, something is wrong.
A premium SUV worth £22,000 that has been in stock for 45 days can be within normal limits: buyers in that segment take longer to decide, compare more options, and sometimes need to manage financing before committing.
A luxury vehicle worth £45,000 that has been in stock for 90 days can be perfectly normal, or it can be a sign that the price is out of step with the market. In that segment, the difference between a correct price and one that is 5% too high can mean weeks of difference in turnover.
That is why the analysis of days in stock must always be done in context: comparing with the history of the same type of vehicle in your dealership, not applying a single metric to the entire inventory.
See also how Euro 7 regulations and LEZs affect used stock.
What to do when days in stock go up
When your average days in stock for the month exceeds your usual threshold, there are four levers of action sorted by cost and speed of impact.
Price adjustment. This is the most direct lever. A car that has been unsold for 45 days and is at market price probably needs a reduction of between 3% and 7% to generate interest again. A car at £12,000 that drops to £11,500 can go from having no interest to having several potential buyers in a few days.
See how to reduce days in stock with dynamic pricing.
Greater visibility on portals. Featuring the advert, updating photos, or expanding the description. Many portals prioritise newer adverts or those with more interactions in their results. An advert that has been published for 40 days without being touched has lost visibility compared to new listings.
Change of channel. If the car has been published on the same portals for weeks without response, it may have more reach on a different channel. A niche vehicle (sports car, SUV, van) might have more demand in specialized portals or Facebook groups than in generalist portals.
Review of the buying strategy. If several cars of the same type have been sitting for a long time, the problem may not be the sale, but the purchase. You may have bought a vehicle profile that does not roll over well in your area or in your usual price range. This analysis prevents repeating the same mistake on the next purchase.
Days in stock and real financing cost: the calculation that many overlook
If you have a stock finance line, every day that a car is in inventory has a direct cost that accumulates silently and that many dealerships do not include in the calculation of the real margin of each operation.
Also read what stock finance is and how it works for dealerships.
The calculation is simple. If the purchase value of the vehicle is £10,000 and your stock finance interest rate is 7% per annum, the daily financing cost is: 10,000 x 0.07 / 365 = £1.92 a day.
If that car takes 80 days to sell, the accumulated financing cost is £153. If it takes 30 days, it is £57. The difference of 50 days means a £96 lower net margin on that operation.
On a larger scale, with 20 cars in stock with an average value of £10,000 and a difference of 20 days in average turnover, the difference in financing costs is approximately £767 per month. This money does not appear explicitly on any invoice, but it comes out of the margin of each vehicle.
That is why reducing days in stock is not just a matter of operational efficiency: it is a direct lever on business profitability.
Dealcar and real-time days-in-stock control
Dealcar automatically records the entry-to-stock date of each vehicle and calculates the days in inventory in real time. From the dashboard, you can see at a glance which cars are above your usual threshold and act before the stocking cost eats into the margin.
The system also allows you to calculate the average days in stock by period, by type of vehicle, and by sales channel, which facilitates the analysis of what is and isn't working in your turnover process. If you want to see how it works, request a demo at dealcar.io.
Frequently asked questions
Are days in stock counted from when I dynamic buy the car or from when I advertise it?
From when the car enters your inventory, which usually coincides with the purchase date or vehicle collection date. Advertising it later does not "stop the clock": financing costs and depreciation start from the moment the vehicle is yours. That is why preparing and listing the car as soon as possible is part of turnover management.
Does it make sense to calculate days in stock for cars that haven't been sold yet?
Yes, and it is especially useful. Knowing that you have 4 cars that have been in stock for over 60 days gives you actionable information: you can act on those specific vehicles before the problem worsens. Do not wait for the end of the month to review turnover: do it weekly with the live inventory.
How do days in stock affect the calculation of the real margin?
The gross margin (selling price minus purchase price) does not include the cost of days in stock. The net margin must include it: selling price minus purchase price minus preparation minus administrative fees minus financing cost proportional to the days in stock. A car with a £2,000 gross margin and 90 days in stock with 7% financing has a real net margin that is £300 to £500 lower, depending on the purchase value.
What happens if a car has been in stock for more than 90 days and there is no buyer?
At a certain point, the price must be lowered enough to unload it, even with a minimal margin. A car that has been in stock for 120 days is generating costs every day and occupying space that could be taken by a vehicle with faster turnover. Keeping it in the hope of finding a buyer at the original price is usually a mistake: the opportunity cost of that tied-up capital usually exceeds the price difference you are trying to recover.
Do days in stock affect the valuation of the dealership if I want to sell it?
Yes. A buyer or investor analysing a dealership looks at average stock turnover as an indicator of operational efficiency. High and consistent turnover is a sign of a well-run business. Stock with many cars sitting for over 60 days indicates buying or selling problems that the buyer will have to resolve.
