Hello QuickWeeknightChef.
To answer your question directly, garlic powder is indeed much more concentrated than fresh garlic since the moisture has been removed. The standard culinary conversion ratio is that 1/4 teaspoon of garlic powder is equivalent to one medium fresh garlic clove.
Since you are in a rush to finish dinner, you can safely use this ratio for your recipe. For highlights of cooking tips, you can refer to our database later.