Healthy
Reorder point378 units
Days to stockout35.7 days
Order qty suggested298 units30-day replenishment
Capital locked$90,000
Stock vs reorder point500 / 378
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Free D2C calculator
Inventory Reorder Point Calculator
Track multiple SKUs, calculate reorder points, forecast stockout dates, and keep working capital optimised.
Free to use · No signup · Calculations run in your browser · Choose any currency
Works for any market. Enter your own costs and rates.
Total SKUs3
Working capital$143,600Locked in inventory
Critical SKUs1
Reorder now1
01
Your SKUs
Healthy
Reorder point252 units
Days to stockout35.6 days
Order qty suggested202 units30-day replenishment
Capital locked$44,800
Stock vs reorder point320 / 252
Critical
Reorder point572 units
Days to stockout3.6 days
Order qty suggested1,152 units30-day replenishment
Capital locked$8,800
Stock vs reorder point80 / 572
Scenario estimate based on your inputs. It does not connect to your store or replace actual settlement and cost reports.
How to use this calculator
For each SKU, enter stock, daily sales, supplier lead time, safety days and unit cost. Review the reorder point and estimated stockout date, then compare them with incoming purchase orders.
Worked example
At 10 units sold per day, a 14-day lead time and 7 safety days, the reorder point is 210 units. The safety-stock allowance is 70 units. Review replenishment when available stock approaches that level.
What the estimate leaves out
Sales velocity is assumed constant. Seasonality, supplier delays, incoming orders, minimum order quantities and batch sizes need a separate review. This tool does not sync with your inventory system.
Use inputs from the same reporting period and compare the result with your actual costs before making a decision.
Explore order operations services ↗Read the complete inventory reorder point guide ↗
When should you reorder each SKU?
- Reorder point
- Average daily sales multiplied by the sum of supplier lead time and safety days. This is a trigger stock level, not the quantity to purchase.
- Safety stock
- A buffer expressed as days in the input. Multiply those days by average daily sales to get buffer units.
- Days to stockout
- Current stock divided by daily sales at the assumed constant rate. Incoming purchase orders and seasonal demand are not included.
Why it matters
Plan Reorders Before Stock Runs Low
Stockouts lose revenue and trust; over-stocking locks up cash. A reorder plan helps balance availability with working capital.
- 01
Prevent lost sales
Know when stock will cross the reorder threshold before a best-seller disappears.
- 02
Free up working capital
See how much cash is sitting in each SKU and avoid unnecessary replenishment.
- 03
Account for lead times
Order early enough for stock to arrive before the safety buffer is consumed.
Frequently asked
Straight answers.
What is a reorder point?
It is the stock level that should trigger a new purchase order: daily sales multiplied by supplier lead time plus safety days.
How much safety stock should I keep?
Use enough days to cover normal demand and lead-time variation, then revisit it using actual supplier and sales volatility.
What's working capital locked in inventory?
It is current on-hand units multiplied by their cost per unit across all SKUs.
How do I reduce stockout risk without over-investing?
Use SKU-level sales velocity, realistic lead times, and a measured safety buffer instead of applying one rule to the whole catalogue.
Check the next part of the picture.
RTO Cost Calculator ↗
Estimate return-to-origin costs and compare possible reductions in failed deliveries.
Cash Runway Calculator ↗
Understand monthly burn and how long the current cash balance can support it.
Calculation method and examples maintained by MlabsGrowth. See the assumptions above before using an estimate.
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