Free Inventory Calculators
Plug in your numbers, get answers. No signup required.
Safety Stock Formula and Calculator
Find the right buffer to hold, with the Z-score formula or the simple max-minus-average way. 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 →Inventory Replenishment Calculator
Plan a full replenishment cycle: when to order, how much, and what the next 8 weeks look like, across four methods.
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
Put in your SKUs, how many ran out last quarter, and for how long. Estimate the sales you lost, then add your own guess for lost ground on Amazon and the price of a rush order.
Open calculator →Inventory ROI Calculator
Put in your price, how many you sell a day, and how long you were out. Estimate what that one gap cost you, then add your own guess for lost ground on Amazon and the price of a rush order.
Open calculator →Skip the formulas entirely
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