Head rice yield (HRY) is the primary factor used to determine rice milling quality. HRY is defined as the percentage of paddy rice that retains at least three-quarters of the original length of the grain after milling. The milled rice percentage is also reported.

Estimated moisture content is taken from at least 10% of the number of samples. The ideal moisture content to proceed with determining HRY is 12 % – 14 %. About 150 g of cleaned paddy rice is dehulled, milled, and sorted for head rice; weighing of the samples is done between these three steps.

Note: For head rice yield determination, the sample weight required is at least 150 g of paddy rice placed in a paper bag. In order to keep the integrity of the customers' samples, senders are requested to place them in secured plastic boxes.