Scaling Recipes Up and Down
The basic math is simple: divide your desired servings by the original servings to get a scale factor, then multiply every ingredient by that factor. A recipe for 4 scaled to 6 uses a factor of 1.5 (6/4 = 1.5).
However, some ingredients don't scale linearly. Spices and seasonings should be increased more conservatively — start at 75% of the calculated amount and adjust to taste. Baking powder and baking soda follow specific rules that deserve extra attention.
Essential Measurement Conversions
3 teaspoons = 1 tablespoon. 16 tablespoons = 1 cup. 2 cups = 1 pint. 2 pints = 1 quart. 4 quarts = 1 gallon. For metric: 1 cup ≈ 237 ml, 1 tablespoon ≈ 15 ml, 1 teaspoon ≈ 5 ml.
Weight measurements (grams, ounces) are more accurate than volume (cups, tablespoons) for baking. A cup of flour can vary by 20-30% depending on how it's scooped.
Temperature and Timing
When scaling recipes, cooking times don't scale linearly. A doubled recipe in the same pan may need 50% more time, not double. Always check for doneness rather than relying solely on time.
Oven temperature generally stays the same when scaling — it's the cooking time that changes. However, if you're using a larger or different shaped pan, temperature adjustments may be needed.
Questions people ask
- Can I halve a recipe that uses one egg?
- Yes! Beat the whole egg and use half. For odd amounts, weigh the beaten egg and use half the weight. A large egg is about 50g, so use 25g for half.