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Inventory Management Toolkit
Everything you need to plan inventory—free calculators, benchmarks, and guides built for Shopify merchants.
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📊 Inventory Calculators
5 tools · Free foreverSafety Stock Calculator
Calculate exactly how much safety stock you need based on your lead time, demand variability, and target service level. Used by merchants managing seasonal demand and supplier lead times.
Reorder Point Calculator
Calculate your reorder point so you always place purchase orders at the right time. Essential for synchronizing purchase orders with supplier lead times.
Inventory Turnover Calculator
Calculate your inventory turnover ratio and Days Inventory Outstanding (DIO). Used to benchmark cash flow efficiency against retail industry standards.
EOQ Calculator
Economic Order Quantity (EOQ) tells you the mathematically optimal amount to order each time. Ideal for balancing warehouse holding costs against supplier ordering fees.
Stockout Cost Calculator
Calculate exactly how much stockouts cost your business in lost revenue and profit. Critical for quantifying lost revenue and justifying inventory investments.
📘 Learn Inventory Management
6 GuidesWhat is Safety Stock?
The buffer inventory formula every merchant needs.
EOQ Explained
Find the optimal order quantity that minimises cost.
How to Set a Reorder Point
Know exactly when to place your next order.
Inventory Turnover Benchmarks
How your ratio compares across 6 retail industries.
The True Cost of Stockouts
Quantify the revenue impact of running out of stock.
Inventory Incident Response
What to do when your ERP overwrites your stock.
🔬 Proprietary Tools
Currently in developmentBuilt on top of Inventory Guard's monitoring engine. No generic calculator site can replicate these.
Inventory Incident Analyzer
Upload your Shopify inventory export to automatically detect suspicious inventory behavior, ERP sync failures, and root causes of stockouts.
Inventory Health Score
A composite score across turnover, safety stock, stockout risk, and lead time — with actionable recommendations.
Currently in developmentShopify CSV Analyzer
Paste your Shopify inventory export and get instant analysis, anomaly detection, and benchmarks.
Currently in developmentInventory Incident Simulator
Model the impact of an ERP sync failure, bad CSV import, or manual adjustment on your inventory levels.
Currently in developmentMulti-location Stock Balancer
Calculate optimal stock transfers between warehouses and retail locations to prevent regional stockouts.
Currently in developmentInventory Adjustment Audit
Analyze who changed what inventory level and when — connect changes to root causes automatically.
Currently in developmentCalculators plan inventory. Inventory Guard monitors it.
Calculators tell you what should happen. Inventory Guard monitors what actually happens and alerts you before it causes stockouts.
Plan
Use our free calculators.
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Monitor
Detect unexpected inventory changes automatically.
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Respond
Investigate root causes safely.
Start Monitoring →
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