Calculate how many kilos of chicken you need to purchase to prepare the forecasted number of portions. Yield for chicken thighs is 92%. The recipe requires 1 kg of chicken thighs to yield 12 portions of sample-sized dishes at this type of event. Formula: Forecasted portions sold recipe yield = number recipe ingredients must be multiplied by Formula: Number recipe ingredients must be multiplied by x recipe requirement = quantity required Formula: Quantity required yield percentage = purchase quantity