Recipe Scaler

A recipe written for four servings rarely matches the table you are cooking for. This recipe scaler converts the whole ingredient list at once: paste the ingredients one per line, enter the number of servings the recipe was written for and the number you need, and every leading quantity is multiplied by the resulting factor. "2 cups flour" at 1.5× becomes "3 cups flour"; "1 1/2 tbsp butter" halved becomes "¾ tbsp butter".

The parser accepts quantities the way real recipes write them: whole numbers, decimals, plain fractions (1/2), mixed fractions (1 1/2) and unicode fraction characters (½, ¼, ¾ and friends). Amounts measured in cups, tablespoons or teaspoons are rounded to the nearest quarter, because no kitchen owns a 0.37-cup measure; gram and milliliter amounts keep plain numeric precision suited to a scale. Lines that do not start with a number — "salt to taste", "zest of one lemon" — cannot be scaled honestly, so they are passed through unchanged with a clear not-scaled mark rather than silently guessed at.

A word of caution that most scaling charts skip: multiplication is only the arithmetic part of scaling a recipe. Salt and other seasonings should be increased more cautiously than the main ingredients, chemical leavening such as baking powder often needs less than a straight multiple in large batches, and cook times depend on pan size and surface area, not on the amount of dough. The tool states this next to every result so a tripled recipe does not end up over-salted or under-baked.

Everything runs locally in your browser — no upload, no account, and the page keeps working offline once loaded. If your recipe also needs unit conversion, for example cups into grams for a kitchen scale, pair this tool with our cooking measurement converter, which translates volumes to weights using real ingredient densities.