Fill Rate Calculator
Share of demand met from stock on hand.
Fill rate by units
95.0%
250 units not filled
How the Fill Rate Calculator works
Fill rate measures how much of what customers asked for you could actually supply from stock. It is the direct counterpart to service level: the target is set in planning, and fill rate reports what was achieved.
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 is fill rate calculated?
Units shipped ÷ units ordered × 100, or the equivalent by order lines or complete orders. The three give different numbers — order fill rate is always the harshest, since one missing line fails the whole order.
What is a good fill rate?
95-98% for most retail and ecommerce. Below 90% customers notice and start hedging their orders. Chasing 100% requires safety stock that usually costs more than the last few percentage points are worth.
How does fill rate relate to service level?
Service level is the probability of not stocking out during a replenishment cycle. Fill rate is the proportion of demand actually met. They correlate but differ — a brief stockout on a fast mover damages fill rate far more than service level suggests.
How do I improve it?
More safety stock on the lines that fail most often, shorter or more reliable lead times, and better forecasting on volatile products. Focus on the specific SKUs driving the misses rather than raising stock across the board.