All calculators / Inventory
Inventory calculators and formulas
For shops and warehouses that hold stock. Work out cost of goods sold, how fast stock turns, when to reorder and how much to order at a time, so cash isn't tied up on the shelf.
Most used
Cost of Goods Manufactured CalculatorCalculate cost of goods manufactured from raw materials, direct labor, overhead and work in process, with cost per unit and cost of goods sold.COGS CalculatorCost of goods sold from your inventory counts and purchases, plus gross profit and margin if you add revenue.Inventory Carrying Cost CalculatorAdd up what it costs to hold your stock for a year: the money tied up in it, storage, insurance and losses. See it in dollars, as a percentage of inventory value, and per unit for the EOQ formula.Inventory Turnover CalculatorHow many times you sold through your inventory in a period, and how many days stock sits on the shelf on average.EOQ CalculatorThe order size that keeps the combined cost of placing orders and holding stock as low as possible.Reorder Point CalculatorThe stock level that should trigger your next order, including safety stock to cover slow deliveries and busy days.
Inventory formulas
| What it measures | Formula | Calculator |
|---|---|---|
| Cost of goods sold (COGS) | Beginning inventory + purchases − ending inventory | COGS → |
| Inventory turnover | COGS ÷ average inventory, where average inventory = (beginning + ending) ÷ 2 | Inventory Turnover → |
| Days of inventory | 365 ÷ inventory turnover | Inventory Turnover → |
| Economic order quantity (EOQ) | √(2 × yearly demand × cost per order ÷ holding cost per unit per year) | EOQ → |
| Reorder point | Average daily sales × lead time in days + safety stock | Reorder Point → |
| Cost of goods manufactured (COGM) | Direct materials used + direct labor + overhead + beginning WIP − ending WIP | Cost of Goods Manufactured → |