How to Scale a Recipe
Whether you are cooking for a crowd or making a smaller portion, scaling recipes is a common kitchen task. Simply divide the desired servings by the original servings to get your scale factor, then multiply each ingredient by that factor.
This calculator handles the math automatically and converts results to convenient kitchen-friendly fractions, so you do not need to figure out what 0.375 cups means (it is 3/8, or approximately 1/3 cup).
Recipe Scaling Formula
- Scale Factor: Desired Servings / Original Servings
- New Amount: Original Amount x Scale Factor
How to Use This Calculator
- Enter original servings: How many servings the recipe makes as written.
- Enter desired servings: How many servings you want to make.
- Enter ingredient amounts: Input the amounts for up to 5 ingredients.
- Click Calculate: See scaled amounts in convenient fractions.
Tips for Scaling Recipes Successfully
- Be careful with spices: When scaling up by more than 2x, add spices gradually and taste as you go.
- Watch leavening agents: Baking powder and soda do not scale linearly. Use 75-80% when doubling.
- Adjust cooking time: Larger batches take longer. Check for doneness rather than relying on time alone.
- Consider pan size: When scaling up, ensure your cookware can accommodate the larger volume.
- Scale in batches: For baked goods, making 2 separate batches often gives better results than one doubled batch.
Recipe Scaler Calculator FAQ
How do I double a recipe?
To double a recipe, multiply every ingredient by 2. This calculator does it automatically for any scale factor. Note that some ingredients like spices and leavening agents may not scale linearly, so taste and adjust seasonings when scaling up significantly.
Can I halve a recipe?
Yes, set the original servings to the recipe amount and desired servings to half that. The calculator will divide all ingredients by 2. For odd measurements, it rounds to the nearest convenient fraction (1/4, 1/3, 1/2, 2/3, 3/4).
Do baking recipes scale well?
Baking is more sensitive to scaling than cooking. Yeast, baking powder, and baking soda do not always scale linearly. When doubling baked goods, use 1.5-1.75x the leavening instead of 2x. Cooking times and oven temperatures may also need adjustment for larger batches.
How do I scale a recipe for 30 people?
Enter the original recipe servings (e.g., 4) and desired servings (30). The calculator will multiply all ingredients by 7.5x. For large batches, consider making multiple smaller batches to maintain quality, especially for baked goods and delicate sauces.
What about cooking times when scaling?
Cooking times do not scale proportionally with ingredients. When doubling, add about 25-50% more cooking time. Use a thermometer to check doneness. For oven recipes, you may need to adjust temperature down by 25 degrees when cooking larger quantities.