How do I double a recipe?

Multiply every ingredient by 2. For baking, also account for pan size (use a larger pan or two pans), slightly reduce leavening agents by 25% for large batches to avoid over-rising, and increase oven time by 10-25% while checking for doneness early. Do not double spices and salt — start at 1.5x and adjust to taste.

Can I halve any recipe?

Most recipes halve well, especially soups, stews, and sauces. Baking is trickier — use exact measurements (a kitchen scale helps), divide eggs by whisking and measuring by weight, and reduce pan size. Some recipes with odd numbers of eggs work better at two-thirds scale than half. Cooking times decrease by roughly 25% for halved recipes.

How do I convert cups to grams?

Conversion depends on the ingredient because different ingredients have different densities. Common conversions: 1 cup all-purpose flour = 120-125g, 1 cup sugar = 200g, 1 cup butter = 227g, 1 cup water = 236ml = 236g. For accurate baking, always use weight (grams) rather than volume (cups).

Do cooking times change when scaling recipes?

Yes. Doubling a recipe increases cooking time by approximately 10-25% depending on the dish. The exact increase depends on whether volume or surface area changed more. Thicker items (casseroles, loaves) need proportionally more time. Use a thermometer for doneness rather than relying solely on time, and check 10 minutes before the estimated time.

Recipe Scaling Guide: How to Double, Halve, and Convert Any Recipe

Cooking for 12 when the recipe serves 4? Baking a single cake when the recipe makes three dozen cookies? Recipe scaling is an essential kitchen skill, but it is not always as simple as multiplying everything by 2. Some ingredients do not scale linearly — leavening agents, spices, and cooking times all require adjustments. This guide teaches you the math, the science, and the common pitfalls of scaling recipes up or down.

February 23, 2026 12 min read Cooking

The Basic Scaling Formula

Scaling Factor = Desired Servings ÷ Original Servings
Multiply each ingredient by the scaling factor

For a recipe serving 6 that you want to serve 15: 15 ÷ 6 = 2.5. Multiply every ingredient by 2.5.

Measurement Conversion Reference

Measurement	Equivalent	Metric
1 tablespoon	3 teaspoons	15 ml
1 cup	16 tablespoons	237 ml
1 pint	2 cups	473 ml
1 quart	4 cups	946 ml
1 gallon	4 quarts	3.78 L
1 stick butter	8 tablespoons / 0.5 cup	113 g
1 pound	16 ounces	454 g

Ingredients That Need Special Attention

Leavening Agents (Baking Powder, Soda, Yeast)

Do not simply multiply leavening agents proportionally for large batches. Over-leavening causes collapse, metallic taste, or uneven texture. Rules of thumb:

Doubling: Use 1.75x the leavening (not 2x)
Tripling: Use 2.5x the leavening (not 3x)
Yeast: Scales more linearly but add proofing time for larger dough batches

Spices and Salt

Start at 1.5x when doubling a recipe and adjust to taste. Strong spices (cayenne, clove, cinnamon) intensify disproportionately in large batches. Salt should be added conservatively and corrected at the end.

Eggs

For halved recipes requiring 1 egg: whisk the egg and use half by weight (approximately 25 grams). For odd-number scaling, round down and adjust liquid slightly if needed.

Cooking Time Adjustments

Doubled recipes in same pan size: Increase time 10-25%
Doubled recipes in larger pan: Time stays similar (more surface area)
Halved recipes: Reduce time by 25-30%
Always check doneness early: Use thermometer, toothpick test, or visual cues
Oven temperature stays the same unless the pan is significantly deeper

Cooking Calculator Tools

Free Online Calculators:

Recipe Scaler — Scale ingredients automatically
Temperature Converter — Fahrenheit / Celsius
Percentage Calculator — Quick math
Scientific Calculator — Advanced calculations
Measurement Guide — Conversion reference

Frequently Asked Questions

Multiply all ingredients by 2. For baking, reduce leavening to 1.75x, start spices at 1.5x, use larger pan or two pans, and increase cook time 10-25%.

Most recipes halve well. For baking, use a scale, divide eggs by weight (~25g per half), reduce pan size, and cut cooking time by ~25%.

Depends on ingredient: flour = 120-125g/cup, sugar = 200g/cup, butter = 227g/cup. For accurate baking, always use weight (grams) over volume (cups).

Yes. Doubling adds 10-25% time. Halving reduces by ~25%. Use thermometer for doneness, check early, and keep oven temperature the same.

Calculators

Related Guides

Measurement Conversions
Calculator Guide