A mixture of 1 teaspoon of paprika, 2 teaspoons of ground cumin, 1 teaspoon of cayenne pepper, 1 teaspoon of oregano and 2 teaspoons of garlic powder can be used in place of chili powder. This homemade chili powder recipe substitutes measure for measure for commercial chili powder.
Another quick chili powder substitution is a dash of hot pepper sauce plus a sprinkle of oregano and cumin to taste. Commercial chili powders vary in exact composition from brand to brand, but they usually contain mostly dried chili peppers with the addition of some combination of cumin, oregano, garlic powder and salt. Some chili powders contain only ground chili peppers.