Calculate potential savings from vendor managed inventory including reduced ordering cost, lower stock levels, and improved fill rates.
Vendor Managed Inventory (VMI) is a supply chain collaboration model where the supplier takes responsibility for maintaining agreed-upon inventory levels at the customer's location. Instead of the customer placing purchase orders, the supplier monitors consumption data and replenishes stock proactively. This approach reduces ordering costs, lowers average inventory levels, and typically improves fill rates.
The savings from VMI come from three primary sources: reduced ordering and administrative costs (the supplier handles replenishment decisions), lower average inventory levels (because the supplier can optimize across multiple customers), and improved fill rates (because the supplier has better visibility into demand patterns).
This calculator helps you estimate the potential annual savings from implementing a VMI program by comparing current-state costs with projected VMI-state costs across these three dimensions.
Understanding this metric in quantitative terms allows manufacturing leaders to prioritize improvement initiatives and allocate limited resources where they will deliver the greatest operational impact. Tracking this metric consistently enables manufacturing teams to identify performance trends early and take corrective action before minor inefficiencies escalate into significant production losses.
VMI programs typically deliver 10-30% inventory reduction, 50-70% ordering cost reduction, and 2-5 percentage point fill rate improvement. Quantifying these savings is essential for building the business case and selecting the right suppliers for VMI partnerships. Having accurate figures readily available streamlines reporting, audit preparation, and strategic planning discussions with management and key stakeholders across the business.
VMI Savings = Ordering Savings + Carrying Savings + Fill Rate Improvement Value Ordering Savings = Current Ordering Cost × Reduction % Carrying Savings = Current Inventory × Reduction % × Carrying Rate Fill Rate Value = Improved Orders × Avg Order Value
Result: $70,000 annual VMI savings
Ordering savings: $50,000 × 60% = $30,000. Carrying savings: $500,000 × 20% × 25% = $25,000. Fill rate value: $15,000. Total: $70,000 annual savings.
Successful VMI requires trust and transparency between trading partners, IT infrastructure for data sharing (EDI 852/867, APIs, or web portals), clearly defined roles and responsibilities, agreed-upon inventory parameters (min, max, target), and performance metrics with regular review cadences.
Track these KPIs monthly: average inventory level vs target, inventory turns, fill rate, number of stockouts, number of excess events, ordering transactions eliminated, and total cost compared to pre-VMI baseline. Dashboard these metrics for both parties.
Lack of data quality causes the supplier to make poor decisions. Unclear parameters lead to overstocking or stockouts. Insufficient executive sponsorship allows the program to stall during implementation challenges. Not addressing demand variability caused by promotions or seasonality leads to poor performance during volatile periods.
VMI is a supply arrangement where the supplier is responsible for maintaining inventory at the customer's location. The customer shares demand and inventory data, and the supplier decides when and how much to replenish.
Companies report 10-30% inventory reduction, 50-70% reduction in ordering/admin costs, and 2-5% fill rate improvement. Total savings typically range from 5-15% of the total spend managed under VMI.
Ideal VMI candidates are high-volume, high-frequency suppliers with sophisticated IT systems and stable product lines. They should represent significant spend and have the logistics capability to make frequent, smaller deliveries.
At minimum: current inventory levels, demand forecasts, consumption history, and agreed min/max parameters. Real-time or daily data sharing produces the best results. Some VMI programs also share production schedules.
VMI means the supplier manages replenishment decisions but the customer owns the inventory upon delivery. Consignment means the supplier owns the inventory until the customer consumes it. They can be combined but are distinct concepts.
A typical VMI implementation takes 3-6 months per supplier, including IT integration, process design, parameter setting, parallel testing, and go-live. Start with a pilot supplier before rolling out broadly.