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Doubling a recipe for a crowd, or cutting it in half for a smaller batch, means recalculating every single ingredient — tedious and easy to get wrong when quantities include fractions.
This calculator scales every ingredient in your recipe to a new number of servings, converting the results back into easy-to-read cooking fractions.
How it works
Enter the recipe's original number of servings and the number you want, then list each ingredient with its quantity and unit. The calculator finds the scale factor between the two serving sizes and multiplies every ingredient by it, rounding the result to the nearest common kitchen fraction (like 1/4, 1/3, or 1/2).
- Enter the recipe's original servings and how many you want.
- Add each ingredient with its quantity and unit.
- Generate the scaled recipe and download a printable PDF.
Examples
Scaling up for a dinner party
A recipe for 4 that calls for 2 cups of flour scales to 3 cups when doubled to 6 servings.
Scaling down for a smaller batch
A recipe for 8 that calls for 1 cup of butter scales down to 1/4 cup for just 2 servings.
Who should use it
- Doubling or tripling a recipe for a larger gathering.
- Halving a recipe to cook a smaller portion or reduce leftovers.
Industry applications
- Home cooking and meal planning
- Small-batch baking and catering
Advantages
- Converts scaled quantities into practical cooking fractions instead of awkward decimals.
- Handles any number of ingredients and any scale factor, up or down.
Limitations
- Does not adjust cooking time, temperature, or pan size — only ingredient quantities.
Common mistakes to avoid
- Forgetting that scaling a recipe doesn't automatically scale bake time or pan size — a much larger batch may need a bigger pan or longer cook time.
- Not scaling seasoning and spices proportionally along with the main ingredients, leading to an under- or over-seasoned result.
Best practices
- For recipes scaled up significantly, taste and adjust seasoning at the end rather than assuming a perfectly linear scale-up will taste identical.
Tips
- For baked goods, be cautious scaling by more than 2-3x in one batch — very large batter or dough volumes can behave differently than the original recipe expects.