Scale a recipe without losing the thread
Enter the original batch, the batch you want, and each ingredient quantity. KitchenCalc handles the ratio.
Recipe scaling is simple multiplication, but a busy kitchen makes simple math surprisingly easy to misread. KitchenCalc gives you a small working table for servings, ingredient names, and quantities, then applies one transparent scale factor to every row. The result keeps a decimal value for precision and adds a fraction rounded to the nearest eighth so you can decide what is practical with the measuring tools you own.
The scale factor is desired servings divided by original servings. If a soup serves four and you want six, the factor is 1.5. Two cups of stock become three cups, while half a teaspoon of spice becomes three-quarters of a teaspoon. When a scaled quantity lands between familiar measures, treat the fraction as a helpful kitchen approximation and consider taste or texture adjustments for salt, spices, and leaveners.
The calculator rejects zero and negative serving values because they do not describe a usable recipe ratio. It also asks for a name and a positive quantity in every ingredient row. Units are intentionally left as the unit you type, since the same number can mean cups, grams, teaspoons, cans, or pieces. Add rows for the full recipe and use the displayed list as a mise-en-place checklist.
Some recipes do not scale perfectly. Yeast, baking powder, gelatin, and cooking times can need a little judgment, especially when you double or halve a baked good. Pan size and batter depth may change the bake more than the ingredient ratio. For those cases, pair the scaler with the Baking Pan Converter and Oven Temperature Converter, then use the first result as a careful test rather than an automatic guarantee.
Reference table
| Original batch | Desired batch | Scale factor |
|---|---|---|
| 4 servings | 2 servings | 0.5× |
| 4 servings | 6 servings | 1.5× |
| 8 servings | 12 servings | 1.5× |
| 10 servings | 5 servings | 0.5× |
Worked example
Example: a 4-serving recipe with 2 cups of flour becomes 3 cups for 6 servings. The 1.5× result is also shown as a kitchen-friendly fraction when appropriate.
Frequently asked questions
Why are fractions rounded to eighths?
Eighths match common measuring cups and spoons while keeping the display readable.
Should I scale baking time too?
Usually not by the same ratio. Check earlier or later based on pan depth and the size of the baked item.