Measurements used in all the recipes, unless otherwise specified. My cup measurements are as follows:
1 Cup = 240 ml
½ Cup = 120 ml
¼ cup = 60 ml
⅛ cup = 30 ml
1 Teaspoon teaspoon = 5 ml
1 Tablespoon (tbsp) = 3 teaspoon = 15 ml
2 Tablespoon = 30 ml = ⅛ cup
4 Tablespoon = 60 ml = ¼ cup

Many people ask me to give measurement in weight. But I feel not everyone will be having a weighing scale in the kitchen, so the easiest way is to choose a cup that matches specified measurement. That way, you can have the same amount of ingredient if measured.
For Indian cooking, I feel plus or minus 10 ml difference is okay, but not more than that. Don't forget to use cup measurements especially while baking.