Inventory turnover, reorder point, and stock calculators. Browse our free inventory tools below — all calculators are instant, accurate, and require no sign-up.
Days of Inventory Calculator — Calculate days of inventory outstanding (DOI/DSI) to measure how long stock sits before selling. Enter inventory and COGS for instant results.
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.