- Measure recent demand. Enter units sold and the number of days represented by that sales total.
- Enter replenishment lead time. Include production, supplier processing, and transit time until stock is sellable.
- Choose safety coverage. Add extra days of average demand to buffer routine variability.
- Enter inventory position. Record available units and only confirmed incoming units.
- Set target coverage. This determines how much stock you want after replenishment arrives.
- Act on the trigger and quantity. Reorder when inventory position approaches the reorder point, then adjust for minimum batches or case packs.
Etsy Reorder Calculator
The Etsy Reorder Calculator estimates the inventory level that should trigger replenishment and the quantity to order or produce. It combines average daily demand, supplier or production lead time, safety stock, current available inventory, and incoming units.
This tool is useful for avoiding stockouts without carrying unlimited inventory. The calculation is a planning baseline: highly seasonal demand, uncertain lead times, minimum order quantities, and production bottlenecks may require a larger or differently timed replenishment.
Calculator inputs
days
days
days
days
Result
—
reorder point
Average daily demand—
Safety stock units—
Inventory position—
Suggested reorder quantity—
Average daily demand = Units sold ÷ Period days
Safety stock = Average daily demand × Safety days
Reorder point = Average daily demand × Lead time + Safety stock
Suggested reorder quantity = max(0, Target cover days × Average daily demand + Safety stock − Available units − Incoming units)
The model uses constant average demand and deterministic lead time. It rounds the trigger and order quantity up to whole units.
What the result means
The main result is the inventory position at which replenishment should be triggered under the entered assumptions.
Review demand and lead-time inputs frequently for seasonal or fast-changing products.
Given: 120 units sold in 30 days, 14-day lead time, 7 safety days, 58 available units, no incoming units, and 45 target cover days.
Calculation: Daily demand = 120 ÷ 30 = 4 units. Safety stock = 4 × 7 = 28 units. Reorder point = 4 × 14 + 28 = 84 units. Target stock = 4 × 45 + 28 = 208 units. Suggested reorder = 208 − 58 = 150 units.
Result: Replenishment should already be triggered because the inventory position is below 84 units, with a suggested quantity of 150 units.
What is inventory position?
In this simplified calculator, it is available units plus confirmed incoming units. Businesses may also subtract allocations or backorders when those quantities are material.
How should I choose safety days?
Use the variability of demand and lead time as a guide. More uncertainty or a higher stockout cost generally supports a larger buffer.
Can I use orders instead of units sold?
Use units for SKU replenishment. Orders can understate demand when customers buy multiple units in one order.
What if the suggested quantity is zero?
Current and incoming inventory already meet the target coverage under the entered sales pace. Recalculate as sales, lead time, or purchase commitments change.
Does this account for minimum order quantities?
No. Round the suggested quantity to the supplier’s minimum, case pack, production batch, or storage constraint after reviewing the result.