Cooking Conversions Without the Guesswork
Recipes from different parts of the world use different measurement systems, and even within the same country there are usually two scales running side by side: volume measurements like cups and tablespoons, and weight measurements like grams and ounces. American recipes lean heavily on cups; European and Australian recipes lean heavily on grams; British recipes often mix the two. This converter handles the full set in one place — pick a starting amount and unit, choose your ingredient if you need a weight conversion, and read every other equivalent at once.
Volume vs Weight
The trickiest part of cooking conversion is the gap between volume and weight. A cup of flour and a cup of sugar both occupy the same space, but they weigh very different amounts because the ingredients have different densities. Flour is light and airy, so a cup is about 125 grams. Granulated sugar is denser, so a cup is about 200 grams. Brown sugar packed firmly is heavier still. Honey, syrup, and other thick liquids are heavier than water by volume. The ingredient picker in this tool applies the correct density when you convert between volume and grams.
Why Bakers Prefer Grams
Professional bakers almost always weigh ingredients rather than measure them by volume. The reason is precision: a cup of flour can vary by 30 grams or more depending on how tightly it is packed, whether it has been sifted, and how full the cup actually is. Two cooks following the same recipe with cup measurements can produce noticeably different doughs. Weight removes that variability — 250 grams of flour is always 250 grams. If a recipe gives both cup and gram measurements, the gram measurements are the more reliable ones to follow.
Cup Sizes Across Countries
The cup itself is not a single standardized unit worldwide. The US customary cup is 240 milliliters, the metric cup used in Australia and parts of Europe is 250 milliliters, and the legal US cup used on nutrition labels is 240 ml. The differences are small enough not to matter for most home cooking but can add up across multiple measurements in baking. This tool defaults to the US cup of 240 ml; if a recipe explicitly uses a different cup size, scale the amount accordingly.
Liquid Ounces vs Weight Ounces
The word "ounce" causes regular confusion. A fluid ounce is a measure of volume — 1 fluid ounce equals about 30 milliliters. A weight ounce is about 28.35 grams. They are not interchangeable. Water happens to be one of the few substances where 1 fluid ounce weighs almost exactly 1 ounce by weight, which is the source of the original definition, but for almost everything else the two values diverge. When a recipe says "8 oz of chocolate" it almost always means 8 ounces by weight (227 grams), not 8 fluid ounces — when in doubt, weigh.
Oven Temperature
American recipes give oven temperatures in Fahrenheit, most of the rest of the world uses Celsius, and older British recipes often use gas marks. The conversion between Fahrenheit and Celsius is exact: °C = (°F − 32) × 5/9. Gas marks are a coarser British scale running from ¼ to 9, where each mark is 25°F apart. The reference table on this page covers the most commonly cited oven settings. Convection ovens run about 25°F (or 15°C) cooler than the equivalent conventional oven setting; if a recipe was written for conventional baking, drop the temperature accordingly when using a fan oven.
Sticks of Butter
American butter is sold in sticks. One stick is half a cup, eight tablespoons, four ounces by weight, or 113 grams. American recipes often call for "1 stick" or "½ stick" and assume the reader knows the conversion. European butter is sold in 250-gram blocks or 200-gram packs and is rarely measured in spoons or cups. When converting an American recipe, the easiest substitution is to weigh the butter rather than try to figure out how to measure half a stick from a metric block.
Frequently Asked Questions
Is 1 cup of flour really 125 grams?
That is the standard for "spoon and level" flour — fluffed up, spooned into the cup, and leveled off with a knife. If you scoop directly with the cup it can pack to 150 grams or more. Recipes generally assume the spoon-and-level convention.
Why does my recipe say "by weight" or "by volume"?
That distinction usually appears for ingredients where weight and volume differ significantly — chocolate chips, nuts, dried fruit. By weight is the more precise option; by volume is more convenient if you don't have a scale.
How do I scale a recipe up or down?
Multiply each ingredient by the same factor. A doubled recipe needs twice the flour, sugar, eggs, and salt. Cooking times do not double in the same way — they increase only modestly because the surface area to volume ratio changes more slowly than the volume itself.
This converter is free and runs entirely in your browser. Bookmark it for the next time you tackle a recipe written in a measurement system you are not used to.
Try also: Temperature Converter · Weight Converter