Days of Inventory Calculator
Calculate days of inventory outstanding (DOI/DSI) to measure how long stock sits before selling using inventory and COGS.
Free Inventory Calculators
12 toolsInventory turnover, reorder point, and stock calculators. Browse our free inventory tools below — no sign-up required.
Dead Stock Cost Calculator
Calculate the true cost of dead stock including purchase price, storage fees, and opportunity cost. Identify how much unsold inventory is costing you.
E-commerce EOQ Calculator
Calculate Economic Order Quantity to minimize total inventory costs. Enter annual demand, order cost, and holding cost for the optimal order size.
E-commerce GMROI Calculator
Calculate Gross Margin Return on Inventory Investment (GMROI) to measure inventory profitability. Target above 200% for healthy performance.
E-commerce Inventory Turnover Calculator
Calculate your inventory turnover ratio and days to sell inventory. Enter COGS and average inventory value to benchmark performance.
E-commerce Reorder Point Calculator
Calculate the exact reorder point for your products. Enter daily sales, lead time, and safety stock to prevent stockouts and optimize orders.
E-commerce Safety Stock Calculator
Calculate optimal safety stock levels using the Z-score method. Enter demand variability and lead time to protect against stockouts.
Inventory Shrinkage Calculator
Calculate inventory shrinkage rate and dollar loss from theft, damage, and errors. Compare recorded vs. actual inventory to find discrepancies.
Overstock Cost Calculator
Calculate the true cost of overstocked inventory including carrying costs and markdown losses. Quantify excess inventory impact on profitability.
Product Velocity Calculator
Calculate product sales velocity to rank SKU performance. Enter units sold and time period to identify fast and slow movers in your catalog.
Sell-Through Rate Calculator
Calculate your sell-through rate to measure how quickly inventory sells. Enter units sold and total inventory to evaluate product performance.
SKU Rationalization Calculator
Score and evaluate SKUs for potential discontinuation. Weigh revenue, margin, velocity, and carrying cost to identify underperforming products.