Example 1
- Servings: 4 → 6
- Amount: 2
3
2 × (6/4) = 3.
Recipe Scaler
Enter the servings in the recipe, the servings you want, and one ingredient amount. The calculator multiplies the amount by the serving ratio: target ÷ original. From 4 servings to 6 the factor is 1.5, so 2 units become 3. From 2 servings to 3 with amount 250 the result is 375. Keep the unit from the recipe — the calculator does not convert it.
Result
Enter servings and amount. The result will appear here.
Cup to mass: cup to grams. Spoons: tablespoon and teaspoon. Oven: baking temperature.
How results are calculated
amt2
serv4→6
new3
The recipe scaling calculator multiplies one ingredient amount by the serving ratio. The formula is new = amount × (target servings / original servings). At 2 for 4 servings to 6, the result is 3, because the factor 6/4 = 1.50.
At 250 for 2 servings to 3, the result is 375. When you reduce servings from 8 to 4 at amount 400, the result is 200. Equal servings leave the amount unchanged.
Enter original servings, target servings, and the ingredient amount. Keep the amount unit from the recipe: cups, grams, spoons, or milliliters. The metric/US switch does not convert cups into gallons and does not change the serving factor.
Both serving counts must be greater than zero. Amount zero stays zero. A negative amount is rejected. The target-servings field rounds the display to a whole number, but the calculation uses the value you entered.
This is neither an oven-temperature converter nor a cup-to-mass calculator. Convert oven temperature on the baking page. Convert a cup of sugar or a spoon of oil on the neighboring page first, then enter the ready amount here.
Enter 4, 6, and 2, then check that the result is 3 at factor 1.50. Then 2, 3, and 250: the result is 375.
How to use this calculator
- Enter 4 original servings, 6 target servings, and amount 2.
- The result is 3 at factor 1.50.
- Enter 2, 3, and 250. The result is 375.
- Repeat for each ingredient separately.
- Leave oven temperature on the baking page.
Formula
new = amount × (target / original)
Original servings > 0. Target servings > 0. Amount ≥ 0. Example: 2 × (6/4) = 3.
Servings and factor
New amount is amount times the serving ratio. 2 at 4 to 6 is 3. 250 at 2 to 3 is 375.
- servings
- The original serving count and the target count. Both must be greater than zero.
- factor
- Target servings divided by original servings. At 6/4 the factor is 1.50.
- amount
- The ingredient number from the recipe, in the unit the recipe uses.
- new
- Scaled result. At 2 × 1.50 the result is 3.
Examples
Example 2
- Servings: 2 → 3
- Amount: 250
375
250 × (3/2) = 375.
Example 3
- Servings: 8 → 4
- Amount: 400
200
400 × (4/8) = 200.
Related calculators
Frequently asked questions
How is the new ingredient amount calculated?
The calculator multiplies the recipe amount by the ratio of target servings to original servings. At 2 for 4 servings scaled to 6, the result is 3, because the factor 6/4 = 1.50.
Does the calculator guess the unit of the amount?
No. The unit stays yours: cups, grams, spoons, or milliliters. The metric/US header switch does not convert the amount.
Are zero or negative servings allowed?
No. Both serving counts must be greater than zero, because we divide by the original. Amount zero is allowed and stays zero. A negative amount is rejected.
Why does the target-servings field show a whole number?
The display rounds to a whole number, but the math uses the value you entered. At 2 for 4 servings to 6.5, the amount result is 3.25, not a value from rounded 7.
Should oven temperature also be multiplied by the factor?
No. Here you scale an ingredient amount. Convert oven temperature on the baking temperature page, without multiplying the scale.
Where do I convert a cup of sugar to grams or a spoon to ml?
Cup to mass and tablespoon to milliliters are on the neighboring pages. Here you multiply an amount you already have.
Does a comma in the serving count work?
Yes. A comma and a period are the same fraction. At 2 for 4 servings to 6.5, the result is 3.25.
What do the fields in the result panel show?
The primary result is the new amount. Beside it you see the factor, the servings you entered, and the rounded target-servings display.
Do I need to repeat the calculation for every ingredient?
Yes. The factor is the same, but units may differ. Scale sugar in grams and oil in spoons separately.
How is this different from ml to grams?
Here you change the serving count. On ml to grams you convert volume to mass at a density, without a serving ratio.
How do I scale a recipe to a different serving count?
Divide target servings by original servings, then multiply the ingredient amount by that factor. From 4 to 6: 6 ÷ 4 = 1.5. At amount 2: 2 × 1.5 = 3.
What is the factor when you double a recipe?
Exactly 2 when target servings are twice the original. Every ingredient amount is then multiplied by 2.
How do I halve a recipe?
Set target servings to half the original. The factor is 0.5. At amount 250 the result is 125 in the same unit.
Should salt, yeast, and baking time be multiplied straight?
The calculator only multiplies the amount you enter. For large scale-ups, salt, spices, and leaveners often need a gentler tweak. Baking time and oven temperature are not multiplied by the factor.
How is this different from cups to grams?
Here you change the serving count while keeping the ingredient unit. Cup-to-mass converts volume to product mass and does not compute servings.
What is 250 when scaling from 2 servings to 3?
Factor 3 ÷ 2 = 1.5. New amount: 250 × 1.5 = 375. The unit stays whatever the recipe used.
Knowledge sources
Scaling is a proportion: new amount = amount × (target / original). Recipe arithmetic, not a NIST standard.
Page updated November 3, 2026.