Recipe Scaling Calculator
Scale any recipe up or down by servings and rescale one ingredient amount to match — with the exact scaling factor shown.
How it works
Factor = desired servings ÷ original servings · Scaled amount = original amount × factor
Scaling a recipe is a single multiplication once you know the factor — the ratio of the servings you want to the servings the recipe was written for. Every ingredient uses the same factor, so you can rescale them one at a time. Remember that cooking times, pan sizes and seasoning do not scale linearly, so treat the factor as a starting point for amounts, not for the oven timer.
Worked example
A recipe serves 4 and you want 6, so the factor is 6 ÷ 4 = 1.5×. An ingredient calling for 2 cups becomes 2 × 1.5 = 3 cups; a teaspoon of salt becomes 1.5 teaspoons.
Frequently asked questions
Does everything in the recipe scale by the same factor?
The ingredient quantities do. Cooking time, pan size and strong seasonings like salt, spice and leavening often need judgment — double the batter but the bake time rises only a little.
How do I halve a recipe?
Enter the same original servings and half as many desired servings — the factor becomes 0.5×, so every amount is cut in half.
Can I scale by weight instead of servings?
Yes. Put the original total weight (or any base amount) as "original servings" and your target as "desired servings"; the factor works the same for any consistent unit.
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This calculator is for educational purposes. Double-check important results before acting on them.