Plain rice

Chawal

No spoon/piece conversion requested.

Instead of Plain rice

Basmati rice
Use the same weight, rinse and soak for 15 minutes; it cooks firmer and more aromatic.
Long-grain rice
Use the same weight and similar water; it is less aromatic but behaves much the same.
Parboiled rice
Use the same weight, soak for 20 minutes and cook with about 1.5 times its volume of water; it takes longer and stays firmer.