Replenishment Calculator
What to order this cycle, across products.
Replenishment quantity
300
to reach 720 target
Rounding to the 100 minimum adds 10 units of extra cover.
How the Replenishment Calculator works
Replenishment planning turns a forecast into a purchase order. The arithmetic is straightforward — target cover minus what you have and what is coming — and the discipline is in doing it on a schedule rather than when something runs out.
Not financial advice. Marketplace fees change, and they vary by country, plan and seller status. Every rate here is an editable default, not a quoted price — check the platform's current fee schedule before you price a product against it. This is not tax or business advice.
Frequently asked questions
How do I calculate a replenishment quantity?
(Forecast demand over the cover period + safety stock) − current stock − stock on order. The cover period should span your review cycle plus lead time, otherwise you will be short before the next order lands.
How often should I run replenishment?
Weekly for fast movers, monthly for the long tail. More frequent review means lower average stock and more orders; less frequent means the opposite. Match the cycle to the value and volatility of the product.
Should replenishment be automated?
Automate the calculation, review the output. Automated ordering works well for stable products with reliable data and fails badly on seasonal peaks, promotions and anything where accuracy has slipped.
What about products with no sales history?
Use an analogue — a similar product's early sales curve — and order a deliberately small first quantity. New products are where forecasting is least reliable and over-ordering is most expensive.