Free Inventory Calculators
Plug in your numbers, get answers. No signup required.
Safety Stock Calculator
Find the right buffer to hold, the simple way or with the Heizer and Render formula. Set it to how often you want to be in stock.
Open calculator →Reorder Point Calculator
Find the stock level that should set off your next order, from your lead time, your daily sales, and your buffer.
Open calculator →EOQ Calculator
Work out your Economic Order Quantity with the Wilson formula. Weigh what each order costs against what holding stock costs, and find the best batch size.
Open calculator →Days of Supply Calculator
See how many days your current inventory will last at your current sales rate. Includes incoming inventory and stockout date projection.
Open calculator →Inventory Turnover Calculator
See how well you move stock. Work out how many times it turns over, and how many days it lasts, from what it cost you and what you hold.
Open calculator →Stockout Cost Calculator
Work out what running out really costs. The sales you lose. The ad spend you wasted. The buyers who leave. The ground you give up on Amazon. And the extra work.
Open calculator →Inventory ROI Calculator
Put in your price, how many you sell a day, and how long you were out. See what that one gap cost you, including lost ground on Amazon and the price of a rush order.
Open calculator →Skip the formulas entirely
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