Recipe scaler: adjust the servings
To go from 4 to 6 servings, multiply every quantity by 6 ÷ 4 = 1.5: 250 g of flour becomes 375 g and 3 eggs become 4.5.
- Checked on thousands of cases
- Updated November 6, 2026
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Test yourself: every answer is computed by the tool, and the wrong choices are the most common traps.
How it works
Formula: New quantity = quantity × servings wanted ÷ recipe servings
The factor is the servings you want divided by the servings of the recipe. The tool multiplies the number at the start of each line by it: whole numbers, decimals (1.5 or 1,5), fractions (1/2), mixed numbers (1 1/2), ½ ¼ ¾ ⅓ ⅔ ⅛ and ranges (2-3). Lines without a quantity, such as "salt and pepper", are kept as they are. Only the quantities change: the pan size and the cooking time are up to you.
Worked examples
From 4 to 6 servings
Factor 1.5: 250 g of flour becomes 375 g.
From 4 to 2 servings
3 eggs become 1.5 eggs.
From 6 to 4 servings
Factor 0.667: 1/2 cup becomes 0.33 cup.
Common mistakes
Multiplying by the new number of servings: 250 g × 6 = 1,500 g.
Multiply by 6 ÷ 4: 375 g.
Turning the factor upside down: 250 × 4 ÷ 6 = 166.67 g for 6 servings.
Servings wanted on top, recipe servings below: 375 g.
Rounding small amounts too early.
1/3 teaspoon × 1.5 = 0.5 teaspoon: keep the precision, then round to the nearest measure.
What the calculation leaves out
- Only the quantities change: cooking time and pan size still need adjusting.
- Very small amounts (salt, yeast, spices) may need rounding to taste.
Multiplier by number of servings
| Recipe for | For 1 | For 2 | For 4 | For 6 | For 8 | For 12 |
|---|---|---|---|---|---|---|
| 2 | ×0.5 | ×1 | ×2 | ×3 | ×4 | ×6 |
| 4 | ×0.25 | ×0.5 | ×1 | ×1.5 | ×2 | ×3 |
| 6 | ×0.167 | ×0.333 | ×0.667 | ×1 | ×1.333 | ×2 |
| 8 | ×0.125 | ×0.25 | ×0.5 | ×0.75 | ×1 | ×1.5 |
Frequently asked questions
How do I halve a recipe?
Press ×½ or enter half the servings: every quantity is divided by 2. 3 eggs give 1.5; round to what works in your kitchen.
Can I paste a recipe from a website?
Yes: paste the ingredient list, one ingredient per line. Only the number at the start of each line changes; the rest of the text is kept.
Does the cooking time change too?
The tool leaves it alone: cooking time does not simply follow the quantity, it also depends on the size and depth of the pan. Check for doneness as you go.