Free Inventory Calculators

Plug in your numbers, get answers. No signup required.

Safety Stock Calculator

Calculate the right buffer stock using the basic method or the statistical Heizer & Render formula. Adjust for your target service level.

Find the exact inventory level that should trigger your next order, based on lead time, daily sales, and safety stock.

Calculate your Economic Order Quantity using the Wilson formula. Balance ordering costs against holding costs to find the optimal batch size.

See how many days your current inventory will last at your current sales rate. Includes incoming inventory and stockout date projection.

Measure how efficiently you move inventory. Calculate turnover ratio and days sales of inventory from your COGS and average inventory.

Calculate the true cost of running out of stock: lost revenue, wasted CAC, customer churn, Amazon ranking damage, and operational costs.

ReplenishRadar runs these calculations automatically for every SKU, every day. Connect your store for a free inventory report.

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