I found a recipe that I liked but it used garlic powder, and I wondered if I could substitute fresh garlic in its stead.

The Internet to the rescue!

After doing an intensive search here’s what I found at several different sites:

• Fresh garlic is much stronger than its powdered counterpart and may overpower the dish if not used sparingly.
• Fresh garlic is a natural substitute for powdered garlic. In fact, your meal will taste even better! Here’s the replacement ratio to follow: Use 1 medium garlic clove to substitute for ¼ teaspoon garlic powder.
• 1 clove garlic = 1/8 tsp garlic powder
• For every clove of garlic your recipe calls for, use ⅓ teaspoon of garlic powder.
• Garlic in powdered form is much more concentrated than its fresh counterpart, so you will need more for this replacement. Substitute Cooking suggests using one full clove for every ⅛ teaspoon of garlic powder called for in the recipe for best results.
• 2 cloves fresh minced garlic can replace 1⁄2 teaspoon garlic powder.

So there you have it!