This is a chart I have compiled over the years.
Hope it is helpful with your baking!

Ingredient Substitution Chart

ammonium bicarbonate 3/4 teaspoon...
1 tsp baking soda
baking powder (sngl-acting) 1 teaspoon...
1/4 teaspoon baking soda plus 1/2 teaspoon cream of tartar plus 1/4 teaspoon cornstarch
baking powder (dbl-acting) 1 teaspoon...
1/4 teaspoon baking soda plus 1/2 teaspoon cream of tartar plus 1/4 teaspoon cornstarch. Use 1 tsp for every 1 cup of flour.
baking soda 1/2 teaspoon...
2 teaspoons double-acting baking powder (replace the acidic liquid in recipe with non-acidic liquid)
baking soda 1/2 teaspoon....
1/2 teaspoon potassium bicarbonate
buttermilk 1 cup milk
1 tablespoon lemon juice or vinegar (let mixture stand 5-10 minutes)
cake flour 1 cup...
3/4 cup all purpose flour plus 2 tablespoons cornstarch
cake flour 1/3 cup...
1/3 cup all-purpose flour less 1/2 teaspoon
chocolate (bittersweet or semi-sweet) 1 ounce ...
1/2 ounce unsweetened chocolate plus 1 tablespoon granulated sugar
chocolate (unsweetened)

1 oz...
3 tablespoons natural cocoa powder (not Dutch-processed) plus 1 tablespoon unsalted butter, shortening, or vegetable oil

cocoa powder, Dutch-Processed 3 tablespoons...
1 ounce unsweetened chocolate plus 1/8 teaspoon baking soda. Also reduce fat in recipe by 1 tablespoon
cocoa powder, natural unsweetened 1 ounce unsweetened chocolate. (!!!Reduce fat in recipe by 1 tablespoon!!!)
corn syrup, dark 1 cup...
3/4 cup light corn syrup plus 1/4 cup light molasses
corn syrup, light 1 cup ...
1 cup granulated white sugar (increase the liquid in the recipe by 1/4 cup)
cornstarch (for thickening) 1 tablespoon...
2 tablespoons all purpose flour
cream of tartar 1/2 teaspoon...
1/2 teaspoon white vinegar or lemon juice
cream - half-and-half 1 cup...
7/8 cup whole milk plus 2 tablespoons melted unsalted butter
cream, heavy (not for whipping) 1 cup...
2/3 cup whole milk plus 1/3 cup melted unsalted butter
flour, self-rising 1 cup...
1 cup all-purpose flour plus 1-1/2 teaspoons baking powder plus 1/4 teaspoon salt
flour, whole wheat

1 cup ...
7/8 cup all-purpose flour plus 2 tablespoon wheat germ

honey 1 cup...
3/4 cup light or dark corn syrup plus 1/2 cup granulated sugar
lard 1/2 cup...
1/2 cup solid vegetable shortening or
1/2 cup plus 1 tablespoon unsalted butter
milk (sweetened condensed) 14 ounce can ...
blend 1 cup instant nonfat dry milk plus 2/3 cup granulated sugar plus 3 tablespoons melted unsalted butter plus 1/2 cup boiling water
milk (evaporated whole) 1 cup...
1 cup half & half
milk (whole) 1 cup ....
1 cup skim milk plus 2 tablespoons melted butter or margarine
molasses 1 cup...
1 cup dark corn syrup
sour cream

1 cup (or 8 ounces)...
1 cup plain yogurt
or...
1 cup (8 ounces)...
1 tablespoon lemon juice or vinegar plus whole milk to fill 1 cup

tapioca 1 pkg instant or quick-cooking - 1 tablespoon
1-1/2 tablespoons flour
vinegar 1/4 cup...
1/3 cup freshly squeezed lemon juice
yogurt, plain 1 cup...
1 cup sour cream

Compiled by; Leslie Anne McLaughlin Pease, Fine Artist and Still Life Painter