🍳 Recipe Converter: Scale Any Recipe by Servings
By Shihab Mia · Updated 2026-07-13
Start each line with a quantity like 2, 0.25, 1/2 or 1 1/2. Lines without a number (such as "pinch of nutmeg") are copied unchanged.
To resize a recipe, divide the servings you want by the servings the recipe makes, then multiply every ingredient by that number. This recipe converter does it for you: enter the original servings and the desired servings, paste your ingredient list one item per line, and it multiplies each quantity by the scale factor. For a recipe that serves 4 and you want it to serve 6, the factor is 6 divided by 4, which is 1.5, so 2 cups of flour becomes 3 cups and half a teaspoon of salt becomes three quarters of a teaspoon.
What is the Recipe Converter?
Scaling a recipe rests on a single idea: every ingredient changes by the same proportion. That proportion is called the scale factor, and it is simply the servings you want divided by the servings the recipe was written for. If a cake recipe serves 8 and you are baking for 12, the factor is 12 divided by 8, which equals 1.5. Multiply each amount by 1.5 and the ratios between ingredients stay exactly the same, which is what keeps the dish tasting right. Halving works the same way: to turn a recipe for 4 into one for 2, the factor is 2 divided by 4, or 0.5, so you use half of everything.
The fiddly part is not the arithmetic, it is the fractions. Recipes are full of amounts like 1/2 teaspoon, 3/4 cup, or 1 1/2 tablespoons, and multiplying those in your head is where mistakes creep in. This converter reads whole numbers, decimals such as 0.25, simple fractions such as 1/2, and mixed numbers such as 1 1/2. It multiplies each by the factor and then snaps the answer back to the nearest sensible kitchen fraction (halves, thirds, quarters, and eighths) so you get 3/4 cup rather than an unusable 0.7431 cup. When a value is not close to a neat fraction, it shows a tidy decimal instead.
Any line that does not begin with a number is passed through untouched. That means notes like a pinch of nutmeg, salt to taste, or a section heading such as For the sauce all survive the conversion intact. Only the leading quantity is changed; the unit and ingredient name are left exactly as you typed them, so 2 cups flour becomes 3 cups flour and nothing else shifts.
One honest caveat worth knowing: scaling by a clean factor works beautifully for the bulk of a recipe, but a few things do not scale linearly. Cooking times, pan sizes, leavening agents like baking soda, and strong spices often need judgement rather than pure multiplication. Doubling a cake batter does not mean doubling the bake time, and tripling the chili powder can overwhelm a dish. Use the converter for the quantities, then apply a cook's common sense to timing and seasoning.
When to use it
- Doubling a dinner recipe that serves 4 so it feeds a party of 8, without recalculating every ingredient by hand.
- Halving a large-batch cookie or bread recipe when you only want a small tray, turning 3 cups of flour into a clean 1 1/2 cups.
- Adjusting a recipe found online that serves 6 down to a single-portion meal for one, using a factor of about 0.17.
- Scaling a family recipe up for a holiday gathering, for example taking a stuffing that serves 8 up to serve 20.
- Converting a restaurant or catering recipe written for 50 covers down to a home-kitchen batch for 5.
- Batch cooking and meal prep, where you multiply a base recipe by 3 or 4 to portion out a full week of lunches.
How to use the Recipe Converter
- Enter the number of servings the original recipe makes in the Original servings box.
- Enter how many servings you want in the Desired servings box. The scale factor updates automatically.
- Paste your ingredient list into the text area, one ingredient per line, each starting with its quantity (for example 2 cups flour or 1/2 tsp salt).
- Read the scaled ingredient list in the result box, where every leading amount has been multiplied by the factor.
- Click Copy to put the converted recipe on your clipboard, ready to paste into your notes or a shopping list.
Formula & method
Worked examples
A pancake recipe serves 4 and you want to serve 6. Scale the ingredients 2 cups flour, 1/2 tsp salt, and 1 1/2 cups milk.
- Find the scale factor: 6 desired divided by 4 original = 1.5
- Flour: 2 x 1.5 = 3, so 3 cups flour
- Salt: 0.5 x 1.5 = 0.75, which is the neat fraction 3/4, so 3/4 tsp salt
- Milk: 1.5 x 1.5 = 2.25, which rounds to 2 1/4, so 2 1/4 cups milk
Result: 3 cups flour, 3/4 tsp salt, 2 1/4 cups milk
A cookie recipe serves 24 and you only want 8. Halve-and-a-bit the ingredients 3 cups flour, 1 cup butter, and 2 eggs.
- Find the scale factor: 8 desired divided by 24 original = 0.3333
- Flour: 3 x 0.3333 = 1, so 1 cup flour
- Butter: 1 x 0.3333 = 0.3333, which is closest to 1/3, so 1/3 cup butter
- Eggs: 2 x 0.3333 = 0.6667, which is closest to 2/3, so 2/3 of an egg (in practice, beat one egg and use two thirds of it)
Result: 1 cup flour, 1/3 cup butter, about 2/3 egg
Common scale factors for resizing a recipe
| From servings | To servings | Scale factor | What it does |
|---|---|---|---|
| 4 | 2 | 0.5 | Halves the recipe |
| 4 | 6 | 1.5 | One and a half times |
| 4 | 8 | 2 | Doubles the recipe |
| 4 | 12 | 3 | Triples the recipe |
| 8 | 4 | 0.5 | Halves the recipe |
| 6 | 4 | 0.667 | Cuts to two thirds |
| 1 | 4 | 4 | Quadruples a single serving |
How common amounts convert when halved and doubled
| Original amount | Halved (x0.5) | Doubled (x2) |
|---|---|---|
| 1 cup | 1/2 cup | 2 cups |
| 3/4 cup | 3/8 cup | 1 1/2 cups |
| 1/2 cup | 1/4 cup | 1 cup |
| 1 tbsp | 1 1/2 tsp | 2 tbsp |
| 1 tsp | 1/2 tsp | 2 tsp |
| 1/2 tsp | 1/4 tsp | 1 tsp |
| 1 1/2 cups | 3/4 cup | 3 cups |
Common mistakes to avoid
- Adding or subtracting servings instead of dividing. To go from 4 servings to 6 you divide 6 by 4 to get a factor of 1.5, you do not add 2 to every amount. Adding a fixed number breaks the ratios between ingredients and ruins the dish. Always work with the ratio, not the difference.
- Scaling the cooking time along with the ingredients. Quantities scale linearly but time does not. Doubling a cake batter roughly doubles the volume in the pan, yet the bake time might only increase by 10 to 20 percent, and a thicker cut of meat cooks by thickness, not by total weight. Check for doneness rather than multiplying the clock.
- Multiplying strong seasonings blindly. Salt, chili, garlic, and other assertive flavours often do not need full scaling. Tripling a recipe rarely means you want triple the cayenne. Scale seasonings, then taste and adjust rather than trusting the arithmetic alone.
- Ignoring pan size and depth. A doubled batter poured into the same pan will overflow or bake unevenly. When you scale up, move to a larger pan or split the batter across two, and keep the depth similar to the original so heat penetrates the same way.
Glossary
- Scale factor
- The number you multiply every ingredient by, equal to the desired servings divided by the original servings.
- Serving (yield)
- The number of portions a recipe is written to produce, the starting point for any scaling.
- Mixed number
- A whole number plus a fraction, such as 1 1/2, common in recipe amounts.
- Simple fraction
- A quantity written as one number over another, such as 1/2 or 3/4 of a cup or spoon.
- Passthrough line
- An ingredient line with no leading number, such as salt to taste, which the converter copies unchanged.
- Linear scaling
- Changing every quantity by the same proportion, which keeps ingredient ratios constant.
Frequently asked questions
How do I scale a recipe from 4 servings to 6?
Divide the servings you want by the servings you have: 6 divided by 4 equals a scale factor of 1.5. Multiply every ingredient by 1.5, so 2 cups of flour becomes 3 cups and 1/2 teaspoon of salt becomes 3/4 teaspoon. Paste your list into the converter and it applies the 1.5 factor to each line automatically.
How do I halve a recipe?
Use a scale factor of 0.5, which is what you get when the desired servings are half the original. Every amount is multiplied by 0.5, so 1 cup becomes 1/2 cup, 1/2 teaspoon becomes 1/4 teaspoon, and 3 eggs become 1 1/2 eggs. Set the desired servings to half the original and the converter does the rest.
Does the converter handle fractions like 1/2 and 1 1/2?
Yes. It reads whole numbers, decimals such as 0.25, simple fractions such as 1/2 or 3/4, and mixed numbers such as 1 1/2. After multiplying, it snaps the result back to the nearest common kitchen fraction so you get usable amounts like 3/4 cup rather than a raw decimal.
What happens to lines without a number, like salt to taste?
They pass through completely unchanged. The converter only touches the quantity at the start of a line, so notes, section headings, and instructions such as a pinch of nutmeg or salt to taste stay exactly as you wrote them.
Should I scale the cooking time too?
No, not by the same factor. Ingredient amounts scale linearly but time and temperature do not. A doubled cake does not need double the bake time; judge doneness by testing rather than multiplying the clock, and adjust pan size so the depth stays similar to the original.
Can I scale a recipe to a single serving?
Yes. Set the desired servings to 1 and the original to whatever the recipe makes. A recipe for 6 gives a factor of about 0.167, so amounts shrink accordingly. Very small results are shown as fractions or decimals, and you may need to round tiny amounts of eggs or spices to what is practical in the kitchen.