What Is a Good Stock Turn for a Used Car Dealership?
Last updated 2 September 2026 · AutoDemand
Stock turn measures how many times a dealer sells through their average inventory value over a year. The formula is: stock turn = cost of vehicles sold in a period ÷ average stock value held in that period. Dealer-management consultancies and UK motor trade commentators commonly cite a healthy independent used car dealer target somewhere in the region of 6–12 turns per year — roughly once a month to once every six to eight weeks per vehicle — though the right number for any one dealer depends heavily on price point and location.
The formula
Stock turn = cost of vehicles sold in a period ÷ average stock value held in that period.
"Cost of vehicles sold" means what you paid for the vehicles that left as sales in the period, not their sale price. "Average stock value" is your typical stock holding at cost, across the same period — if that fluctuates a lot, average the start and end of the period, or several points across it, rather than using a single snapshot.
A worked example
Say your average stock value held across the year was £60,000, and the cost of vehicles you sold across the year totalled £480,000 (for example, 80 vehicles averaging £6,000 cost each).
Stock turn = £480,000 ÷ £60,000 = 8 times per year — roughly one full turnover of your stock every 6–7 weeks.
Why it matters
A slower stock turn means capital stays tied up in unsold vehicles for longer, those vehicles keep depreciating while they sit, and holding costs — insurance, storage, finance — keep accumulating. A faster stock turn, all else equal, means the same amount of capital can be recycled into more deals across a year.
But stock turn on its own is an incomplete picture — see the common mistakes below.
Common mistakes
Measuring stock turn only in units sold, not stock value. A dealer selling 50 cheap cars a year can look "faster" than one selling 30 expensive ones on a units-only basis, despite tying up very different amounts of capital.
Tracking the aggregate stock-turn ratio without also tracking stock age per vehicle (how many days each individual car has actually been in stock) — the aggregate number can look healthy while hiding a handful of very old, unsold vehicles quietly dragging down real performance.
Chasing a higher stock turn purely by underpricing stock, which can cost more in lost margin than it saves in holding costs.
Practical recommendations
Track stock age (days in stock) per vehicle alongside your aggregate stock-turn ratio, not instead of it.
Set an internal review threshold — many dealers use somewhere around 60–90 days — to flag ageing stock for a price review before it becomes a genuine problem.
Weigh stock turn against margin together, not stock turn alone — a faster turn at meaningfully lower margin per unit isn't automatically the better outcome.
Related questions
How long should a used car stay in stock before I reduce the price?
There's no single universal number, but many independent dealers review pricing once a vehicle passes roughly 30–45 days unsold, since depreciation and holding costs keep accruing the longer it sits.
Does a good stock turn differ by vehicle price point?
Yes — lower-priced stock typically turns over faster than premium or higher-priced stock, so a single "good" stock-turn benchmark doesn't apply evenly across a mixed inventory.
How do I calculate my own dealership's stock turn?
Divide the cost of vehicles you sold in a period by your average stock value (at cost) held across that same period. See the worked example above.
Sources: Dragon2000 — Stock Turn Ratio Calculation Simplified
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