Recipe Scaler

The Recipe Scaler is a free online tool that instantly adjusts ingredient quantities when you need to scale a recipe up or down. Whether you're cooking for a crowd, halving a recipe for two, or converting a family recipe to single servings, this tool calculates perfectly proportioned amounts for every ingredient.

How to Use the Recipe Scaler

1. Enter your ingredients — Add each ingredient with its name, quantity (supports fractions like 1/2 or 3/4), and unit of measurement. Click "＋ Add Ingredient" to add more rows, or select a Quick Example to load a pre-built recipe.
2. Set original servings — Enter the number of servings the original recipe makes.
3. Set desired servings — Enter the number of servings you want. The scale factor indicator updates automatically so you can see the multiplier at a glance.
4. Click Scale Recipe — All ingredient quantities are recalculated instantly. Results show both the original and scaled amounts side by side.
5. Copy or use results — Click the Copy button to save the full scaled recipe as text. Original quantities are shown crossed out for easy comparison.

Understanding the Scale Factor

The scale factor is calculated by dividing the desired number of servings by the original number of servings:

Scale Factor = Desired Servings ÷ Original Servings

For example, if a recipe serves 4 and you want to serve 10, the scale factor is 10 ÷ 4 = 2.5×. Every ingredient quantity is multiplied by 2.5.

Common Measurement Conversions

When scaling recipes, you may need to convert between measurement units. Here are the most common equivalents:

Tips for Scaling Recipes Successfully

• Leavening agents — Baking powder, baking soda, and yeast don't always scale linearly. When doubling, use about 1.5× the leavening. When tripling, use about 2.5×.
• Seasonings and spices — Start with 1.5× when doubling a recipe, then adjust to taste. It's easier to add more than to correct over-seasoning.
• Cooking times — Larger batches may need longer cooking times or lower temperatures. Check doneness rather than relying solely on the timer.
• Pan sizes — Scaling up may require larger or additional pans. Overcrowding a pan affects heat distribution and results.
• Eggs — When a scaled recipe calls for a partial egg (e.g., 1.5 eggs), beat a whole egg and measure out the needed portion.

Frequently Asked Questions

How does recipe scaling work?

Recipe scaling works by calculating a scale factor (desired servings divided by original servings) and multiplying every ingredient quantity by that factor. For example, if a recipe serves 4 and you want to serve 8, the scale factor is 2, so all quantities are doubled.

Can I use fractions like 1/2 cup or 3/4 teaspoon?

Yes. The Recipe Scaler supports fractions (1/2, 1/3, 3/4), mixed numbers (1 1/2, 2 3/4), and decimals (0.5, 1.75). Results are displayed as clean fractions when possible for easier measuring.

What ingredients can I scale?

You can scale any ingredient with a measurable quantity — flour, sugar, butter, milk, spices, and more. Ingredients measured in cups, tablespoons, teaspoons, ounces, grams, pounds, milliliters, and liters are all supported.

Are there any ingredients that don't scale well?

Some ingredients like yeast, baking powder, salt, and spices may not scale linearly. When doubling a recipe, you might use slightly less than double the yeast or baking powder. The tool scales all ingredients proportionally, but experienced bakers may want to adjust leavening agents and seasonings to taste.

Can I scale a recipe down to fewer servings?

Yes. Enter the original serving size and a smaller desired serving size, and the tool will reduce all ingredient quantities proportionally. This is useful for cooking for one or two people from recipes designed for larger groups.

Additional Resources

• King Arthur Baking - Guide to Scaling Recipes
• Serious Eats - How to Scale Up a Recipe