Inventory Reorder Calculator
Reorder point estimate from stock and daily sales
Days of Stock Left
Reorder Point
Order Within
Reorder point = (daily sales × lead time) + safety stock.
Inventory Reorder Calculator — Complete Guide & Instructions
MakeCard Inventory Reorder Calculator tells shopkeepers and inventory managers exactly when to place the next order. Enter current stock, average daily sales, supplier lead time and safety stock; the tool computes days of stock remaining, the reorder point in units ((daily sales × lead time) + safety stock), how many days you have left to order, and a color-coded status banner — healthy, order soon, or critical.
How to Use Inventory Reorder Calculator
- 1 Enter Current Stock in units.
- 2 Enter average Daily Sales in units.
- 3 Enter the Supplier Lead Time in days.
- 4 Enter your Safety Stock buffer in units.
- 5 Read the status banner plus days-left, reorder-point and order-within stats.
Key Features & Capabilities
- Reorder point formula: (daily sales × lead time) + safety stock.
- Days of stock remaining at the current sales rate.
- “Order within X days” figure so you never miss the window.
- Color-coded status: healthy, order soon, or critical.
- All four inputs editable — compare scenarios instantly.
- Clear formula note shown under the results.
Supported Formats & Specifications
| Parameter | Specification |
|---|---|
| Inputs | Current stock · daily sales · lead time (days) · safety stock |
| Formula | Reorder point = (daily sales × lead time) + safety stock |
| Outputs | Days of stock left · reorder point (units) · order-within (days) |
| Status Levels | Healthy · Order soon · Critical |
| Calculation | Instant, in-browser |
Practical Everyday Use Cases
- A retail shop deciding when to reorder a fast-moving SKU.
- A warehouse setting minimum stock levels for each product.
- A small manufacturer timing raw-material purchase orders.
- An online seller avoiding stockouts during a sale season.
- Estimating buffer stock before a supplier's long holiday shutdown.
Pro Tips for Best Results
- Set safety stock to cover a realistic demand spike — one bad estimate causes a stockout, not the formula.
- Use average daily sales over a representative period, not just yesterday's figure.
- Add supplier variability: if lead time sometimes runs 3 days late, add that to your safety stock.
- Recheck the numbers weekly — reorder points drift as sales patterns change.
Common Problems & Solutions
Daily sales is empty or zero — the tool needs a non-zero sales rate to compute days of stock.
Your lead time is longer than your stock coverage — order now or negotiate faster delivery.
Check the safety stock figure — an oversized buffer inflates the reorder level.
Privacy & Security
100% Client-Side Execution
All figures are calculated in your browser — your stock levels and sales data never leave the device.
Frequently Asked Questions
Everything you need to know about using Inventory Reorder Calculator
The stock level at which you should place a new order — calculated as (daily sales × supplier lead time) + safety stock, so new stock arrives before you run out.
Enough to cover demand surges and supplier delays — typically a few days of sales, adjusted to how variable your demand is.
It is the time left before your stock drops to the reorder point — place the order by then to avoid a stockout.
It is the gap between ordering and receiving — the longer it is, the more stock you burn through while waiting, so the higher the reorder point must be.
Yes — run the numbers once per SKU, since sales rates and lead times differ per product.
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