Shopify Seller Tools
Shopify Inventory Restock Calculator
Estimate Shopify restock timing, reorder quantity, inventory cost, sales velocity, lead time, safety stock, stockout risk, and cash tied up in inventory.
Inventory inputs
Enter your current stock, sales velocity, supplier lead time, safety stock, incoming inventory, and unit economics.
Results
Estimated Shopify inventory restock plan.
Recommended restock
236
Units needed to reach the target stock window.
Estimated restock cost
$3,304.00
Recommended restock units multiplied by unit cost.
Available inventory
220
Current inventory plus incoming inventory.
Days of stock
21.7 days
Available inventory divided by adjusted daily sales.
Reorder point
213
Units needed to cover lead time and safety stock.
Days until reorder
0.7 days
Estimated days before inventory reaches reorder point.
Adjusted daily sales
10
Daily sales after growth and seasonal buffer.
Target inventory
455
Units needed for the target stock window.
Inventory value
$3,080.00
Cash currently tied up in available inventory.
Monthly storage cost
$22.00
Estimated monthly cost to hold available inventory.
Potential revenue
$9,900.00
Revenue if available inventory sells at the entered price.
Stockout revenue risk
$0.00
Estimated sales at risk if inventory is below reorder needs.
What this means
You currently have an estimated 220 units available, equal to about 21.7 days of stock after growth and seasonal buffer assumptions.
Your reorder point is estimated at 213 units. To reach your target stock window, this calculator recommends restocking 236 units at an estimated cost of $3,304.00.
Soon: Inventory is still above the reorder point, but restocking should be planned soon.
Sales growth scenario comparison
| Growth | Daily sales | Days stock | Restock units | Status |
|---|---|---|---|---|
| 0% | 9 | 23.9 days | 194 | Soon |
| 5% | 10 | 22.8 days | 215 | Soon |
| 10% | 10 | 21.7 days | 236 | Soon |
| 15% | 11 | 20.8 days | 257 | Urgent |
| 20% | 11 | 19.9 days | 277 | Urgent |
| 30% | 12 | 18.4 days | 319 | Urgent |
| 50% | 14 | 15.9 days | 401 | Urgent |
How to use this Shopify Inventory Restock Calculator
Enter inventory
Add current units on hand and any incoming inventory already ordered.
Add sales velocity
Enter average daily sales, growth expectations, and seasonal buffer.
Set restock rules
Add supplier lead time, safety stock, and the target stock window.
Review restock plan
Check reorder point, restock quantity, stockout risk, and inventory cost.
Shopify inventory breakdown
Review the numbers behind the restock estimate.
Current inventory
Included in the inventory restock estimate.
180
Incoming inventory
Included in the inventory restock estimate.
40
Available inventory
Included in the inventory restock estimate.
220
Adjusted daily sales
Included in the inventory restock estimate.
10
Lead-time demand
Included in the inventory restock estimate.
142
Safety stock units
Included in the inventory restock estimate.
71
Target inventory
Included in the inventory restock estimate.
455
Recommended restock
Included in the inventory restock estimate.
236
Common Shopify restock mistakes
Restocking only after inventory is already nearly sold out.
Ignoring supplier lead time when calculating reorder timing.
Using average sales without a seasonal or growth buffer.
Ordering too much inventory without checking cash tied up in stock.
Not separating fast-moving products from slow-moving products.
Forgetting incoming inventory that is already on order.
Understanding your Shopify restock result
Urgent: Inventory is at or below the reorder point and may need immediate restocking.
Soon: Inventory is above the reorder point, but restocking should be planned soon.
Healthy: Inventory appears balanced for your sales velocity and target stock window.
Overstocked: Inventory may be higher than needed and could tie up cash or storage capacity.
What Shopify sellers should include
Current inventory and incoming inventory already ordered.
Average daily sales or recent sales velocity.
Supplier production, shipping, and receiving lead time.
Safety stock for delays, demand spikes, or seasonality.
Target stock window based on cash flow and reorder schedule.
Unit cost, sale price, and storage cost per unit.
Ways to improve Shopify restock planning
Track sales velocity
Monitor units sold per day by product instead of relying only on total store sales.
Add safety stock
Use extra inventory for supplier delays, seasonal demand, ads, or sudden sales spikes.
Protect cash flow
Avoid tying too much money in slow-moving inventory that takes months to sell.
Plan ahead
Place reorder decisions before inventory falls below the lead-time demand window.