Rex says
Money math without the spreadsheet headache. Plug in your numbers and I'll show you exactly where the dollars land.
Try a scenario
Click to load — tweak from there.Inputs
Result
Inventory turns per year
7.08
Days of supply on hand
51.5
Inventory as % of annual COGS
14.1%
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How to use this
- 1Enter annual cost of goods sold (drugs, supplies, retail) ($).
- 2Enter average inventory value on hand ($).
- 3Read your inventory turns per year on the right — it updates as you type.
- 4Hit Share to keep the scenario or send it to someone.
About this calculator
Inventory sitting on the shelf ties up cash and risks expiring before it's used, while too little on hand causes back-orders that push patients to online retailers. This calculator computes inventory turnover — cost of goods sold divided by average inventory value — and converts it into days-of-supply on hand, which is the more intuitive number for deciding reorder frequency. Well-managed veterinary and dental practices typically turn inventory 6-10 times per year (roughly 36-60 days of supply on hand); turnover below 4 times a year usually means excess stock and cash tied up unnecessarily.
Worked example
Using the values the calculator loads with:
Inputs
- Annual cost of goods sold (drugs, supplies, retail): 340000 $
- Average inventory value on hand: 48000 $
Results
- Inventory turns per year: 7.08
- Days of supply on hand: 51.5
- Inventory as % of annual COGS: 14.1%
What each field means
Inputs
- Annual cost of goods sold (drugs, supplies, retail) ($)
- The annual cost of goods sold (drugs, supplies, retail) used in the calculation, measured in $. Starts at 340000 $ so you have a working example on load.
- Average inventory value on hand ($)
- The average inventory value on hand used in the calculation, measured in $. Starts at 48000 $ so you have a working example on load.
Results
- Inventory turns per year
- Returned as a decimal number and shown as the headline result. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Days of supply on hand
- Returned as a decimal number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Inventory as % of annual COGS
- Returned as a percentage. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
FAQ
What turnover rate should a vet or dental practice target?
6-10 turns per year is a solid general target, translating to roughly 36-60 days of inventory on hand at any time. Practices heavy in slow-moving specialty items or bulk-purchased retail food may run somewhat lower without it being a red flag, provided cash flow supports it.
Why does low turnover matter if the inventory eventually sells?
Cash tied up in slow-moving inventory can't be used for payroll, debt service, or growth investment, and every month it sits is a month closer to expiration for drugs and biologics. Low turnover is effectively an interest-free loan the practice is giving to its suppliers.
How often should average inventory value be recalculated?
Ideally monthly using point-of-sale or practice management software inventory reports, since seasonal demand (heartworm/flea season, holiday dental promotions) shifts the right stocking level throughout the year. A single annual snapshot can miss significant swings.
Accuracy and limitations
- Results are estimates before tax, fees, and inflation unless an input explicitly covers them.
- Rates are treated as fixed for the whole period — variable-rate products will drift from this projection.
- This is educational maths, not financial advice. Check anything contractual with the lender or your accountant.
Related tools
Veterinary/Dental Practice Overhead Ratio Calculator
Fixed and variable overhead as a share of revenue against benchmarks.
Dental/Vet Lab Fee Margin Calculator
True margin on crowns, dentures, and other outsourced lab cases.
Dental/Vet Office Break-Even Calculator
Monthly production needed to cover fixed and variable costs.
Cite this calculator
Writing about this topic? Grab a citation — every link helps keep these tools free.
RevenueLab. (2026). Veterinary Inventory Turnover Calculator. Retrieved from https://www.revenuelab.fyi/toolbox/vet-inventory-turnover
<p>Source: <a href="https://www.revenuelab.fyi/toolbox/vet-inventory-turnover" target="_blank" rel="noopener">Veterinary Inventory Turnover Calculator — RevenueLab</a> (2026).</p>
Source: [Veterinary Inventory Turnover Calculator — RevenueLab](https://www.revenuelab.fyi/toolbox/vet-inventory-turnover) (2026).