Common conversions: 1 cup uncooked rice ≈ 200–240 grams depending on grain type; a standard US cup is about 240 ml. For water, 1 cup = 240 ml. To convert recipes, use weight measures when possible for accuracy (e.g., 1 cup white rice ≈ 185–200 g cooked rice varies).
When in doubt, measure rice by weight for consistent results, especially across different rice varieties. Follow package guidance for specific rice types.