How to use this calculator
Enter current inventory, daily sales, supplier lead time, and safety stock. The calculator estimates inventory days and reorder pressure.
#1020 · E-commerce Tool
Shopify Inventory Calculator
Plan Shopify inventory by calculating stock coverage, reorder point, stockout risk, and inventory health from sales velocity and supplier lead time.
Calculator
Decision inputsunits
/day
days
units
Ad space
What the result means
Healthy inventory balances availability and cash flow. Too little inventory risks lost sales, while too much inventory creates holding cost and dead stock.
Inventory coverage = Current inventory ÷ Daily sales. Reorder point = Daily sales × Lead time + Safety stock.
For seasonal stores, adjust sales velocity before key campaigns or peak demand periods.
Example calculation
With 900 units and 30 daily sales, coverage is 30 days. If lead time is 20 days and safety stock is 150, reorder point is 750 units.
Tips for better results
- Review inventory weekly during peak sales periods.
- Separate fast-moving and slow-moving SKUs.
- Use reorder points before cash is trapped in excess stock.
FAQ
How many inventory days should a Shopify store keep?
Many stores aim for 30 to 60 days, but the right level depends on supplier reliability, demand volatility, and cash flow.
How do I calculate Shopify reorder points?
Multiply average daily sales by supplier lead time, then add safety stock.
What is a healthy inventory turnover for Shopify?
Healthy turnover depends on category, but faster turnover with low stockout risk usually improves cash efficiency.
How can I avoid stockouts on Shopify?
Track sales velocity, lead times, reorder points, and campaign calendars before inventory falls too low.
How much safety stock should an online store keep?
Safety stock should cover demand spikes and supplier delays, often 7 to 14 days of expected sales for stable products.
Related calculators
Decision module
| Metric | Use |
|---|---|
| Coverage days | How long current inventory may last. |
| Reorder point | Minimum stock level before ordering again. |
| Inventory score | Balances stockout and overstock risk. |
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