INVENTORY CASH RELEASE CALCULATOR
See how much cash your stock is quietly locking up
Enter three numbers: annual cost of sales, current stock value, and your sector. In seconds you get a defensible range of cash that could be released from inventory within 12 months, without reducing service levels, plus the ongoing carrying-cost savings that follow.
Three inputs. No spreadsheet. A range you can defend.
THE CORE METRIC
It all starts with stock days
Stock days tell you how long, on average, your capital sits on the shelf before it sells. Fewer days means leaner, faster-moving inventory. More days means more cash tied up. The calculator works out where you sit today, then compares it to what good looks like in your sector.
HOW STOCK DAYS ARE CALCULATED
Stock days = (current stock value ÷ annual cost of sales) × 365
So if you hold £1.5m of stock against £9m of annual cost of sales:
- 1,500,000 ÷ 9,000,000 = 0.167
- 0.167 × 365 = 61 stock days
That is 61 days of trading tied up on the shelf. The gap between that number and the sector benchmark is where releasable cash lives.
SECTOR BENCHMARK RANGES
What good looks like in your sector
Sector matters because a food and drink business and a machinery maker have very different sensible stock levels. The calculator uses these typical benchmark bands to judge where you sit.
Manufacturing & engineering
60–90
TYPICAL STOCK DAYS
Longer cycles, work in progress, and long-lead components push sensible holdings higher.
Wholesale & distribution
40–60
TYPICAL STOCK DAYS
Faster turns and broad ranges mean cash should cycle harder than in manufacturing.
Food & drink
20–40
TYPICAL STOCK DAYS
Shelf life and freshness force tight holdings, so the leanest benchmark band applies.
CONSERVATIVE TO STRETCH
How the release range is estimated and capped
We never quote a single hopeful number. You get a range, floored at a realistic minimum and capped so it stays defensible.
1. Measure the gap
We compare your current stock days to the benchmark band for your sector. The excess days above the benchmark are the theoretical opportunity.
2. Conservative range
The lower estimate assumes you close only part of the gap, moving toward the top of your sector band. This is the number most businesses can hit without disruption.
3. Stretch range
The upper estimate assumes you reach the middle of your sector band. Achievable, but it takes real work on planning, suppliers, and slow movers.
4. The cap
Both figures are capped as a sensible share of stock value so the range never implies emptying the warehouse. Service levels come first.
ONGOING CARRYING-COST SAVINGS
The cash comes back once, the savings come back every year
Releasing cash is a one-off win. But holding less stock also cuts the cost of carrying it: finance, insurance, storage, handling, obsolescence, and shrinkage. As a guide, carrying costs typically run at around 20 to 25 percent of stock value per year. So every pound of stock you no longer hold keeps saving you money long after the cash has come back.
ILLUSTRATIVE EXAMPLE: WHOLESALER
A wholesale distributor with £12m cost of sales and £2.4m of stock sits at roughly 73 stock days, well above the 40 to 60 day benchmark.
- Moving toward the top of the band could release £400k to £500k of cash within 12 months.
- At 20 to 25 percent carrying cost, that also trims £80k to £125k a year in ongoing costs.
Same stock, same service. Just less cash asleep on the shelf.
READING YOUR RESULT
Lean inventory or excess stock: what your number means
At or below benchmark: already lean
A small or empty release range is good news: your working capital is already working hard. Watch that lean does not tip into stockouts. Here the priority shifts from freeing cash to protecting service, lead times, and resilience.
Well above benchmark: excess stock
A large release range points to cash trapped in slow movers, over-ordering, or dead stock. The opportunity is real, but so is the work: forecasting, reorder points, supplier terms, and a clear rule for slow and dead stock all need attention.
HONEST ABOUT THE LIMITS
Three inputs can only take you so far
This calculator is a directional estimate, not a diagnosis. Cost of sales, stock value, and sector give a defensible starting range, but they cannot see everything that shapes the right answer for your business.
Service levels
The model cannot see how close you run to stockouts or how much buffer your customers really need.
Supplier lead times
Long or volatile lead times can justify holding more stock than any benchmark suggests.
Seasonality
Peaks and pre-builds distort a single stock-days snapshot taken at one point in the year.
Stock accuracy
If your recorded stock value does not match the shelf, the starting numbers are already off.
YOUR NEXT STEP
Turn a range into a real annual cash-release estimate
When you are ready to move past three inputs, the site-based Blind Spot Audit factors in service levels, lead times, seasonality, and stock accuracy to build a detailed, defensible estimate of the cash you can release over the next 12 months.