Inventory turnover, days of inventory and a suggested reorder quantity from COGS and average stock value — the standard shop-management maths for deciding how much tooling and material to hold.
Let our engineers find the right factory for your specs. 100% Quality Guaranteed.
Request a Proposal →Inventory turnover measures how efficiently stock is managed. A high turnover means stock is moving quickly; low turnover ties up cash in unused inventory. For tool cribs, this metric drives purchasing and stocking decisions.
4-6x per year is typical for CNC consumables (inserts, end mills). Below 3x suggests overstocking. Above 8x may indicate stock-outs and emergency purchases. The goal is to have the right tools available without excessive inventory cost -- vending machine systems help achieve this balance.
Carrying cost is typically 15-25% of inventory value annually (storage space, insurance, obsolescence, opportunity cost of capital). A $50,000 tool crib at 20% carrying cost loses $10,000/year. Reducing inventory from 6 months to 2 months supply frees up significant working capital.
Tool vending machines dispense inserts, end mills, and shop supplies with employee ID tracking. They typically reduce consumption by 20-35% (eliminates hoarding and waste), automate reordering, and provide usage data by machine/cost centre. Payback is usually 6-18 months for shops with over $30k in annual tooling spend.
Enter the annual cost of goods consumed (or annual tooling spend) and the average inventory value. The calculator shows the turnover ratio, days of inventory on hand, and a suggested monthly order quantity for rebalancing inventory levels.
Continue with closely related tools from the machining calculator library.
Use the calculator freely. If the result points to a tooling or process problem, we can source the exact carbide tooling you need from vetted factories in China. Compare factory-direct pricing.
Before you commit to a spec, it helps to know what the market pays for it. These are real, publicly listed factory prices — not a quotation, and not a guess.
We source the tool families below direct from vetted Chinese factories, matched to the material and tolerance you just worked out. Every batch ships with its material certificate and dimensional record.
Explore more precision machining tools and calculators
Tuning order frequency? Our guide covers the volume tiers that decide your unit price — consolidating line items into fewer, larger lots usually beats changing supplier.
We source carbide cutting tools from China for job shops. We do not own a factory, which is why we can quote your drawing against two or three plants that actually run your material.
Cutting formulas with the units worked through · Speed and feed starting points for all six ISO material groups · How to read a carbide grade past its ISO code. 12 pages.
Or send us a quote you already have — we will benchmark it free →