½ of a vanilla bean pod is equal to 1 teaspoon of paste or extract. You can use a 1-to-1 ratio to substitute paste for extract and vice versa. Read the original article on Chowhound.

Generally, one vanilla bean equals about one tablespoon of vanilla extract or one tablespoon of vanilla paste. Vanilla paste ... if a recipe calls for one teaspoon of vanilla extract, use two ...

Vanilla bean paste and extract can generally be substituted with a 1:1 ratio; start with a teaspoon of each and add more according to your taste. But do make sure you know the difference between ...