What does not scale linearly
Salt, yeast, and bake times are not always linear. The page scales quantities. Cook the dish, do not treat the output as a commercial formula.
Your numbers
Scale the recipe
Original servings and the servings you want. Fractions are fine. We round to the nearest 1/16.servings
servings
Scale factor
1.5×4 servings → 6 servings3 cupsFlour
1 1/8 cupSugar
3Eggs
How we got this
- FlourScaled by 1.5×3 cups
- SugarScaled by 1.5×1 1/8 cup
- EggsScaled by 1.5×3
What we assumed
- Ingredient amounts scale in a straight line. Pan size, cook time, and seasoning might not.
- Displayed fractions round to the nearest 1/16. Smaller positive amounts show as “< 1/16”.
- This does not turn cups into ounces. Densities differ.
Technical details
Method quantity-scaling-v1.1.0Data Manual inputs / fixed rules
Guide
Scaling servings with 1/16 rounding
Each ingredient quantity is multiplied by desired servings ÷ original servings, then rounded to the nearest 1/16. That keeps kitchen fractions usable. It will not convert cups to grams.
Questions about this calculator
How do I double a recipe?
Set desired servings to twice the original. Amounts round to 1/16. Spices may still need tasting.
Terms used here
- Scale factor
- Desired servings divided by original servings.
Practical tips
- If you need metric mass, convert after scaling; this page does not know density.
Limits and caveats
- Exact scaling then 1/16 rounding. Not food-safety advice.
Results are for information. They are not legal, tax, medical, or financial advice. How the math is maintained · Report a wrong figure.
Engine notes
Rounding, versioning, and omissions that sit beside the guide rather than repeating it.
- One scale factor. Desired servings divided by original servings. Every ingredient is multiplied by that same factor.
- Kitchen amounts. Whole numbers, decimals, typed fractions, and common fraction symbols all work.
- Fractions. The scaled amount rounds to the nearest 1/16. Cups are not turned into ounces.