Okay I know the quick tip calculation in my state (CA) of doubling the tax to get the approx tip, i.e., 8.5% x 2 = 17% (+/-).
Just heard another one from a friend. Double the entree (or entree + apps) and you'll get a close ball park of what the meal should cost (meal, drinks, dessert, tax and tip). I tested it. It does seem to give a good ball park of what to expect...although not perfect.
Example: entrees = $20 each x 2 = $40 x 2 = $80.
Anyone hear this one before? Any experience with this or other short hand tips on dining/price?