Inventory GuardFree Inventory Calculators
5 professional-grade inventory planning calculators for Shopify merchants. Live results as you type. Industry benchmarks. Shareable links. No account required.
Each calculator includes the formula, educational content, industry benchmarks, real-world examples, and an FAQ.
✓ Live calculations✓ Industry benchmarks✓ Share results✓ Export PDF✓ No signup
📊 All 5 Calculators
Use in order for best results💡 Recommended order:Safety Stock→Reorder Point→EOQ→Inventory Turnover→Stockout Cost
Step 1
Safety 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.
Step 2
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.
Step 3
Inventory Turnover Calculator
Calculate your inventory turnover ratio and Days Inventory Outstanding (DIO). Used to benchmark cash flow efficiency against retail industry standards.
Step 4
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.
Step 5
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.
What's included in every calculator
⚡
Live calculations
Results update as you type — no submit button.
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Preset examples
Small / Growing / Enterprise presets to get started fast.
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Industry benchmarks
Compare your results against 6 retail industries.
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Smart recommendations
Contextual advice based on your specific results.
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Shareable links
Share your results with inputs encoded in the URL.
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PDF export
Print a professional report to share with your team.
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2,500+ word guides
Comprehensive educational content on each topic.
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Real industry examples
Fashion, electronics, food, and home & garden.
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Detailed FAQ
7+ answered questions per calculator with JSON-LD.
Plan smarter. Monitor automatically.
These calculators help you plan what should happen. Inventory Guard monitors what actually happens — alerting you the moment an unexpected inventory change threatens your carefully planned levels.
Start Monitoring Free →Free forever · No credit card · Installs in 30 seconds