What is a proper to for food delivery?

What is a proper tip to give for food delivery such as pizza, diners, and chinese food? I usually give around $2 or round up to the closest two dollars. What do you think is appropriate? Thanks.

15% is the way to go .

We always tip $2 for the two of us. However, if we have the kids over and have to order 5 pizzas and breadsticks and the whole schmear, then more like $5-7.

I tip 10% of the bill for home delivery drivers.

always tWo dollARS. give the extra change if necessary.