What is converted white rice? Is it regular long grain rice or instant long grain rice? —A.F. Lecanto, FloridaConverted white rice is neither regular long grain rice nor instant long grain rice. Also called parboiled rice, converted rice is the unhulled grain that has been steam-pressured before milling. This process retains nutrients and makes fluffy separated grains of cooked rice. Converted rice takes slightly longer to cook than regular long grain rice.