Stockout rate uses the same demand denominator.

highlighted = computed this step

Divide stockout by demand

Stockout rate is stockout units divided by demand.

stockout rate=stockout/demand\text{stockout rate}=\text{stockout}/\text{demand}
Initial ratesThe table exposes fill rate and stockout rate.initial ratesratefill rate21/25stockout rate4/25

Stockout rate

The stockout rate is 4/25.

8/50=4/258 / 50 = 4/25
Initial ratesThe table exposes fill rate and stockout rate.initial ratesratefill rate21/25stockout rate4/25