How to Scale a Recipe Up or Down (With Examples)

Cooking for two when a recipe serves eight? Feeding a crowd when a recipe only makes four? Scaling recipes is a core kitchen skill — and once you understand the basic math, it becomes second nature. Here's everything you need to know.

The Basic Formula

Scaling a recipe comes down to one formula: divide the desired servings by the original servings to get your scaling factor, then multiply every ingredient by that number.

Scaling factor = desired servings ÷ original servings

For example, if a recipe serves 4 and you want to make it for 10, your scaling factor is 10 ÷ 4 = 2.5. Multiply every ingredient by 2.5.

Worked Example

Original recipe (serves 4): 2 cups flour, 1 cup sugar, ½ cup butter, 2 eggs, 1 tsp baking powder

Scaling to serve 10 (factor = 2.5):

• Flour: 2 × 2.5 = 5 cups
• Sugar: 1 × 2.5 = 2.5 cups
• Butter: ½ × 2.5 = 1¼ cups
• Eggs: 2 × 2.5 = 5 eggs
• Baking powder: 1 × 2.5 = 2.5 tsp

Use our Recipe Multiplier to do this automatically for any recipe.

What Doesn't Scale Linearly

Salt and spices: Don't scale these 1:1. If you're doubling a recipe, start with 1.5x the salt and spices, then taste and adjust. Flavor compounds don't multiply evenly.

Leavening agents: Baking powder and baking soda don't always scale perfectly. For larger batches, use slightly less than the calculated amount — too much leavening can cause baked goods to rise too fast and then collapse.

Cooking time: Bigger batches don't take proportionally longer. Two pans of the same item take roughly the same time as one. A larger single item (like a doubled cake in a bigger pan) will take longer but not twice as long. Use a thermometer or toothpick test rather than relying purely on time.

Pan Size Matters

When scaling baked goods, the pan size needs to change proportionally. Doubling a recipe and putting it in the same pan will overflow and bake unevenly. A general guide:

• 2× a 9-inch round cake → use a 13×9 pan
• 2× an 8×8 square pan → use a 9×13 pan
• For cookies, just bake in multiple batches

Scaling Down: Common Challenges

Scaling down is often trickier than scaling up. The main challenge is eggs — you can't use half an egg easily. Solutions include using just the yolk or just the white, or using a small egg instead of a large one. For very small batches, consider using a recipe specifically designed for smaller yields.

The Fast Way

Skip the manual math with our Recipe Multiplier tool. Enter the original servings, the servings you need, and your ingredient amounts — it does the rest.