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 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.