How many paste tomatoes do you need to make a qt?

A quart is a unit of volume equal to 32 fluid ounces, so to make a quart of tomato sauce, you will need at least 32 ounces of paste tomatoes. Depending on the quantity of other ingredients added to the sauce, such as onions, garlic, herbs and spices, you may need more or less than 32 ounces of tomatoes.