♨ Cooking Guide

Culinary Math: Recipe Scaling & Measurement Guide

How to scale recipe portions, convert volumetric cups to weight, and time baking.

13 free calculatorsFormula includedWorked example

📚 Overview

Cooking is an art, but baking is a precise science. Professional chefs know that volumetric measurements like cups can vary by up to 20% depending on how flour is scooped. Scaling ingredients by weight ensures consistent, restaurant-quality results every time.

📐 Recipe Scaling Factor & Baker's Percentage

Scale Factor = Desired Servings / Original Servings

Multiply every ingredient quantity by the scale factor. In baking, baker's percentage sets flour as 100% and calculates all other ingredients relative to flour weight.

🔢 Worked Example

Scenario: Scaling a cake recipe designed for 4 servings to accommodate 10 dinner guests.

  • Original: 4 servings
  • Desired: 10 servings
  • Flour in original: 200g
  1. Scale Factor = 10 / 4 = 2.5
  2. Scaled Flour = 200g × 2.5 = 500g
  3. Repeat factor 2.5 for all other recipe ingredients
Multiply all ingredients by 2.5 to bake the 10-serving version.

💡 Pro Tips

  • Weighing dry ingredients on a digital kitchen scale produces far more consistent results than measuring cups.
  • One standard US cup of all-purpose flour weighs approximately 120 to 125 grams when aerated.
  • When multiplying recipes, do not multiply salt and strong spices linearly; scale them by 70% first, then adjust to taste.
  • Baking times do not double when doubling batch size; baking pan depth and surface area determine cook duration.

❓ Frequently Asked Questions

How many tablespoons are in one cup?

There are 16 tablespoons in 1 US cup, 8 tablespoons in 1/2 cup, and 3 teaspoons in 1 tablespoon.

How long should you roast a turkey per pound?

At 325°F (165°C), estimate 13 to 15 minutes per pound for unstuffed poultry until internal breast temperature reaches 165°F.

How do you substitute active dry yeast for instant yeast?

Use 25% more active dry yeast than instant yeast, and dissolve active dry yeast in warm liquid before mixing.