How much ';garlic powder'; do I substitute to equal one clove of garlic?

Garlic powder is often substituted if necessary for fresh garlic cloves, using 1/2 teaspoon of garlic powder to equal one fresh clove of common garlic.How much ';garlic powder'; do I substitute to equal one clove of garlic?
One clove of garlic is about 4 grams, so you need to substitute 4 grams of garlic powder.