Short answer: Use pumpkin pie spice in the same total amount as all the individual warm spices (like cinnamon, ginger, nutmeg, etc.) that the recipe calls for, then adjust to taste. A simple rule:

• If your recipe already lists cinnamon, ginger, nutmeg, cloves, etc., add those amounts together and use that much pumpkin pie spice instead.
• If your recipe just says “pumpkin pie spice,” follow that amount exactly with whatever blend you have.
• As a rough guide for a standard 9-inch pumpkin pie, many bakers use about 2 to 2½ teaspoons of pumpkin pie spice; for breads or muffins, about 1½ to 2 teaspoons per loaf/batch is common.