How Much Onion Powder Equals One Onion?

Onion powder is made from dehydrated ground onions. One medium onion is equal to one tablespoon of onion powder. A small onion equals 1/2 tablespoon. If you use a large onion you will have 1 1/2 table spoons of powder. Although a good substitute for onion if you run out, it make not be as strong in flavor.