Baking Powder Substitute

Inevitably, you will run out of baking powder at the height of baking season. Usually the night before Thanksgiving or on Christmas day when it is really impractical to go out for such a tiny thing. How do you cope?

For each teaspoon of Baking Powder required, substitute 1/4 teaspoons baking soda mixed well with 1/2 teaspoon cream of tartar.

For each tablespoon of Baking Powder required, substitute 3/4 teaspoons baking soda mixed with 1 1/2 teaspoons cream of tartar.