Why ratios differ between rice varieties
Different rice varieties have different starch structures, grain density, and bran content, all of which affect water absorption. Long-grain white rice stays fluffy and separate with a 1:2 ratio. Short-grain white rice is starchier and stickier — it needs less extra water because the starch holds moisture, hence 1:1.5. Basmati is a fine-polished long-grain rice that cooks very efficiently at 1:1.5. Brown rice has an intact bran layer that slows water absorption, requiring both more water (1:2.5) and more time (40 minutes).
The absorption principle: all the water you add should be fully absorbed by the time cooking is complete, leaving perfectly cooked grains without waterlogging or burning. The ratios are calibrated for stovetop absorption cooking with a tightly fitting lid.
Water (cups) = Rice (cups) × Ratio
For 2 cups of basmati at 1:1.5: 2 × 1.5 = 3 cups of water.
Water (ml) = Rice (cups) × Ratio × 236.6
Converts the result to millilitres (1 US cup = 236.6 ml).