The short answer
Start with about ½ to ⅔ cup of water per cup of atta, added a little at a time. Chakki atta usually takes a bit more. The dough should be soft and slightly sticky, not stiff.
Quick ratio
| Atta | Water |
|---|---|
| 1 cup | ½ to ⅔ cup |
| 2 cups (about 4 to 5 rotis each) | 1 to 1⅓ cups |
| 1 kg | about 550 to 650 ml |
Adjust as you go
Humid weather needs less water, dry winter air needs more. For paratha, keep the dough slightly firmer so it holds layers.