Example 1
2 at 4 servings toward 6 -> 3.00 at factor 1.50.
Recipe scaling calculator
Type the servings in the recipe, the target servings, and one ingredient amount. 2 at 4 servings to 6 is 3, because the factor is 6/4 = 1.50. 250 at 2 servings to 3 is 375. Keep the unit from the recipe: cups, grams, or spoons stay yours.
Cup to mass: cup to grams. Spoons: tablespoon and teaspoon. Oven: baking temperature.
Result
Enter a value. The result shows up here.
How it works
Scaling multiplies the recipe amount by the serving ratio. 2 at 4 servings to 6 is 2 × 6/4 = 3. 250 at 2 servings to 3 is 375. The factor 6/4 is 1.50. Half the guests, from 8 to 4, is 0.50: 400 becomes 200. One to one leaves the amount alone.
The amount unit is yours: cups, spoons, grams, milliliters. The calculator does not guess whether 2 is cups of flour or teaspoons of salt. That is why the metric/US switch does not convert anything here. Two stays two, whatever the header mode is. If you want a cup of sugar as 200 g, that is the neighbor card.
Original and target servings must be greater than zero, because we divide by the original. Amount zero is fine and gives zero. A negative amount will not run. If either serving field stays empty, the calculator has no ratio to compute.
The target-servings card rounds the writing to the nearest whole number: 6.5 shows 7. The amount and the factor still use the typed 6.5, not the seven. That is a display split, not a second formula.
There is no ingredient price here and no oven temperature. 180 °C stays 180 even when you double a cake. Cup-of-sugar mass is on the neighbouring page. A 15 ml tablespoon and a 5 ml teaspoon are also separate when you only want volume, not a serving scale.
Repeat the math for each ingredient. A recipe for four with 200 g of sugar and 2 tablespoons of oil, cooked for six, is 300 g and 3 tablespoons. The factor 1.50 is the same, the units are not.
How to use
- Type the servings in the recipe, for example 4, the target servings, for example 6, and one ingredient amount, for example 2.
- Click Calculate. 2 at 4 to 6 gives 3. 250 at 2 to 3 gives 375. The factor 6/4 is 1.50.
- Zero servings will not divide. Zero amount gives zero. A negative amount will not run.
- Repeat for each ingredient on its own. Take the unit from the recipe, not from the header.
- A cup of sugar as 200 g is on the neighbouring page. Spoons of 15 ml and 5 ml live on the spoon page.
Formula
new amount = amount × (target servings / original servings)
Original servings > 0. Target servings > 0. Amount ≥ 0. The US header does not enter the formula.
Servings and the amount factor
new = amount × (target servings / original). 2 at 4 to 6 is 3, because the factor 6/4 = 1.50. 250 at 2 to 3 is 375.
- servings
- Original and target, both greater than zero. 8 to 4 at amount 400 gives 200. 4 to 4 leaves 400.
- factor
- The serving ratio. 6/4 = 1.50 turns 2 into 3. 3/2 = 1.50 turns 250 into 375.
Real-life examples
Example 2
1 at 4 servings toward 8 -> 2.00, factor 2.00.
Example 3
250 at 2 servings toward 3 -> 375.00.
Example 4
3 at 6 servings toward 4 -> 2.00, factor 0.67.
Example 5
5 at 1 serving toward 1 -> 5.00, factor 1.00.
Example 6
1.5 at 3 servings toward 9 -> 4.50, factor 3.00.
Example 7
400 at 8 servings toward 2 -> 100.00, factor 0.25.
Example 8
2 at 5 servings toward 7 -> 2.80, factor 1.40.
Ways to use this calculator
- You convert one ingredient from a recipe for four when the original is for six, with no cup guesswork.
- You check the 0.50 factor before you cut every amount in half, because one ingredient is in spoons and another is in grams.
Frequently asked questions
What do I get from 2 at 4 servings to 6?
You get 3. The factor is 6/4 = 1.50, so 2 × 1.50 = 3. 250 at 2 servings to 3 is 375.
What is half the guests, from 8 servings to 4, at amount 400?
You get 200, because the factor 4/8 = 0.50. One to one, 4 to 4, leaves 400 alone.
Is 2 cups, grams, or spoons?
Whatever the recipe says. The calculator does not guess the unit, so 2 at 4 to 6 stays 3 even with US in the header. Two stays two, and the result uses the same measure.
Why does 6.5 target servings show 7 on the page?
The writing rounds to a whole number, but the math still uses the typed 6.5. 2 at 4 servings to 6.5 gives 3.25, not 3.5 from the seven.
Will servings of zero run?
No. We divide by the original, so both serving numbers must be greater than zero. 2 at 0 to 6 does not make a factor.
Is amount zero fine?
Yes. Zero times any factor stays zero, including at 4 servings to 6. A negative amount will not run.
Should 180 °C also go times 1.50?
No. Here you scale an ingredient amount, for example 2 to 3. An 180 °C oven stays on the baking-temperature page, with no scale multiply.
Where do I turn a cup of sugar into 200 g?
On cup to mass. There 250 ml and sugar 200 g. The calculator multiplies an amount you already have: 200 at 4 servings to 6 gives 300.
Where do three tablespoons of oil become milliliters?
On the spoon page. Three tablespoons are 45 ml. Then you can paste that 45 here: at 4 servings to 6 you get 67.5.
Does a comma in 6.5 and in 2.5 work?
Yes. 6.5 and 6,5 are the same serving count. 2 at 4 servings to 6.5 gives 3.25. Skip a space in the middle of the number.
Knowledge sources
The kitchen converter multiplies the measures you type. USDA publishes food weights and composition.
Page updated in 2026.