I have a standard 2 1/2 lb jar of peanut butter and I have one same size container of PB2 powdered peanut butter.
- Powdered Peanut Butter takes 3 times as much space as regular for the same amount of calories.
- Powdered Peanut Butter
- 131 Calories per Ounce
- 4.6 Calories per Gram
- Regular Peanut Butter
- 158 Calories per Ounce
- 5.5 Calories per Gram
So from a weight or size perspective, regular peanut butter is much more efficient. Powdered peanut butter also has much less fat, which is probably why it has fewer calories per oz.