Following an American or European recipe usually requires converting volume measurements to weight — and that is where most kitchen errors come from.
Recipes of American origin usually measure dry ingredients (like flour, sugar, and baking powder) in cups and spoons — volume units — while in many other countries the more reliable standard for baking is to measure in grams, a weight unit. This difference in approach is the main source of error when adapting foreign recipes: one cup of wheat flour weighs about 120 to 130 grams, but one cup of granulated sugar weighs considerably more, around 200 grams, because ingredient density differs.
This means there is no universal conversion from "1 cup" to grams — the value depends on the specific ingredient being measured. That is why professional baking recipes increasingly adopt weighing in grams directly, eliminating this ambiguity, especially in recipes that require precision, such as bread, leavened doughs, and macarons.
For liquids, conversion is more straightforward, since both cups and milliliters are volume units: 1 US cup equals approximately 236.6 ml, while 1 tablespoon equals about 14.79 ml and 1 teaspoon approximately 4.93 ml. It is worth noting that the standard US cup is slightly different from the metric cup used in some countries (250 ml), which can create small variations if the recipe does not specify which standard it uses.
When adapting an international recipe, the safest approach is always to check whether it specifies weight in grams for dry ingredients (many online recipes already offer this option); when that is not available, a kitchen scale combined with an ingredient density table is more reliable than assuming a fixed volume-to-weight conversion.
An important distinction when converting culinary measurements is between volume and weight. Cups, spoons, milliliters, and liters measure volume; grams and kilograms measure weight (mass). For liquids like water and milk, the conversion between volume and weight is approximately direct (1 ml of water ≈ 1 g), but for dry ingredients the relationship depends on density. Confusing these two categories is the origin of most errors when adapting foreign recipes.
Regional variations in culinary measurements add another layer of complexity. The US cup (236.6 ml) differs from the metric cup (250 ml) used in some countries, and the Australian tablespoon equals 20 ml, not 15 ml as in the US standard. When following a recipe, always check the geographic origin to know which measurement standard it adopts — an Australian recipe with 20 ml tablespoons produces different results if interpreted with 15 ml tablespoons.
For those who frequently cook international recipes, it is worth investing in a digital kitchen scale and keeping a volume and weight equivalence table for the most used ingredients on hand. The TudoConversor volume converter covers cups, spoons, milliliters, liters, fluid ounces, and other units, with official factors and double precision, making it easier to adapt recipes from any origin to the standard you have at home.
For common ingredients, approximate weight equivalents help when a scale is not available: 1 US cup of all-purpose flour is about 120 g, 1 cup of granulated sugar about 200 g, 1 cup of butter about 227 g, and 1 cup of honey about 340 g. These values are approximate because they depend on how tightly the ingredient is packed — sifted flour weighs less per cup than spooned flour, which weighs less than packed flour. This is why professional bakers always specify whether a cup measurement is sifted, spooned, or packed, and why weighing in grams remains the most reliable approach for consistent results.
The difference between the US cup (236.6 ml) and the metric cup (250 ml) is already enough to alter the result of sensitive recipes, but there is also the British imperial cup (284 ml), rarely used today but present in old UK recipes. Adding the spoon variations — the US tablespoon of 14.79 ml, the Australian of 20 ml, and the British of 15 ml — it becomes clear why an international recipe can go wrong even when the cook follows seemingly correct measurements: the geographic origin of the recipe determines which volume standard it adopts.
For baking ingredients that require precision, the difference between measuring by volume and by weight can reach 20% in the case of flour, depending on how tightly it is packed in the cup. This is why professional bakers work exclusively with weight in grams and baker's percentages, where each ingredient is expressed as a percentage of the flour's weight. This method makes recipes independent of volume units and fully reproducible, eliminating the variable of ingredient density and packing.