Recipe Scale Calculator
Scale any recipe up or down — multiply every ingredient amount by your serving ratio. Works for cups, grams, ounces, and tablespoons.
What is a recipe scale calculator?
The recipe scale calculator resizes any recipe by multiplying each ingredient amount by the ratio of new servings to original servings.
Formula
Scale factor = New servings ÷ Original servings.
Each ingredient amount × scale factor = new amount.
Worked example
Recipe serves 4, you want 6. Scale factor = 6/4 = 1.5. A 2-cup ingredient becomes 3 cups.
How to use this calculator
- Enter the recipe's original servings.
- Enter your target servings.
- Enter one ingredient amount; the scaled amount appears instantly.
Repeat for each ingredient. Cooking times do not scale linearly — see our cooking-time guide.
Frequently asked questions
Do cooking times also scale?
No. Times scale roughly with the cube root of volume change. A double recipe doesn't take twice as long — usually 20–30% longer for a roast or casserole.
Should I round the scaled amount?
For most ingredients, round to a friendly amount (1/4 cup, 1 tablespoon). For baking, keep the precise amount — small flour or sugar changes affect texture.
Can I scale spices the same way?
Scale linearly for small changes (within 2×). For very large or small batches, taste and adjust — strong flavors (cayenne, garlic) often don't scale linearly.
What about eggs?
Eggs are tricky. 1 egg × 1.5 = 1.5 eggs. Beat one egg, weigh it (about 50g), and use 75g for a 1.5× scale. Or round to nearest whole egg if the recipe is forgiving.