How to Convert Cooking Measurements (Complete Kitchen Guide)

You are halfway through a British baking recipe that calls for 200 grams of caster sugar and 180 milliliters of double cream, but your kitchen has measuring cups and a set of tablespoons. Or maybe you found a classic American recipe online that lists everything in cups and ounces, and you need to convert it for your metric kitchen scale. Either way, you are stuck doing math when you should be cooking.

This guide covers every common kitchen measurement conversion: volume (cups, tablespoons, teaspoons, milliliters, liters), weight (ounces, grams, pounds, kilograms), and temperature (Fahrenheit to Celsius). It also explains why certain conversions matter more than others, why weighing ingredients beats measuring by volume, and how to handle tricky ingredients that do not convert the same way. For instant results, our Cooking Converter handles all of these conversions automatically.

US Customary vs. Metric: Two Systems, One Kitchen

The United States is one of only a few countries that still uses the customary system of cups, tablespoons, teaspoons, fluid ounces, and Fahrenheit for cooking. The rest of the world uses the metric system: grams, kilograms, milliliters, liters, and Celsius. If you cook from international recipes, watch foreign cooking shows, or buy imported cookbooks, you will encounter metric measurements constantly.

The US system measures most cooking ingredients by volume, even dry ingredients like flour and sugar. The metric system typically measures dry ingredients by weight (grams) and liquids by volume (milliliters). This fundamental difference is why converting between the two is not always as simple as plugging numbers into a formula. A cup of flour and a cup of sugar weigh very different amounts, so knowing the weight equivalent of "1 cup" depends entirely on what is in the cup.

Volume Conversions: Cups, Tablespoons, Teaspoons, and Milliliters

Volume conversions within the US system are straightforward because the units are all based on fixed ratios. Converting to metric (milliliters and liters) uses a single multiplier. These relationships never change regardless of the ingredient.

One important note: US cups and imperial cups (used in older British and Australian recipes) are not the same size. A US cup is 237 ml, while an imperial cup is 284 ml and an Australian cup is 250 ml. If you are following a recipe from the UK or Australia, check which cup standard the author is using. Modern metric recipes from these countries typically use milliliters directly, which eliminates the ambiguity.

Weight Conversions: Ounces, Grams, Pounds, and Kilograms

Weight conversions are simpler than volume conversions because the relationship between ounces and grams never changes regardless of the ingredient. One ounce always equals the same number of grams whether it is flour, butter, or chocolate.

Professional kitchens around the world measure almost everything by weight, even liquids. This is because weight is precise and repeatable, whereas volume measurements are highly sensitive to how you fill the measuring cup. Two cooks scooping flour into the same one-cup measure can get amounts that differ by 30 grams or more, which is enough to ruin a cake. Our Unit Converter can handle any weight-to-weight conversion you need.

Temperature Conversions: Fahrenheit to Celsius

American recipes use Fahrenheit; most of the rest of the world uses Celsius. The conversion formula is straightforward but not intuitive enough to do in your head while preheating the oven.

Rather than doing the math every time, memorize the most common oven temperatures or keep this reference handy.

Note that Celsius ovens in European countries often include a fan (convection) setting, which circulates hot air and cooks faster. If a recipe gives a Celsius temperature for a fan oven, reduce the temperature by about 20 degrees Celsius when using a conventional (non-fan) oven, or increase the fan oven temperature by 20 degrees if you are converting the other direction.

Dry vs. Liquid Measuring: Why It Matters

In the US system, dry measuring cups and liquid measuring cups hold the same volume (1 cup equals 237 ml in both), but they are designed differently for accuracy. A liquid measuring cup (usually glass with a spout and markings on the side) lets you fill to the line and pour. A dry measuring cup (metal or plastic, designed to be filled and leveled off with a straight edge) ensures a consistent, flat top.

Using a liquid measuring cup for flour means you cannot level it off, so you tend to under-fill. Using a dry measuring cup for milk means you fill it to the brim and spill when carrying it. More importantly, the way you fill a dry measuring cup dramatically affects how much ingredient you get. Scooping flour directly from the bag compacts it and can give you up to 150 grams per cup, while spooning flour into the cup and leveling yields about 120 grams. That 30-gram difference in a recipe calling for 3 cups means almost a full extra cup of flour, which will turn your tender cake into a dense brick.

Common Ingredient Weights: What Does 1 Cup Actually Weigh?

Because different ingredients have different densities, 1 cup of one ingredient weighs a completely different amount than 1 cup of another. This is the core reason that weight-based recipes are more reliable than volume-based ones. Here are the most commonly needed conversions.

Notice the enormous range: 1 cup of honey weighs nearly three times as much as 1 cup of flour. This is exactly why you cannot simply swap "1 cup" across different ingredients or assume a generic gram-per-cup conversion. Each ingredient requires its own specific weight equivalent.

Why Weighing Is More Accurate Than Volume

Professional bakers and pastry chefs around the world use weight measurements almost exclusively, and for good reason. When you weigh 120 grams of flour on a kitchen scale, you get exactly 120 grams every single time. When you measure 1 cup of flour, you might get anywhere from 115 to 155 grams depending on whether you spooned it, scooped it, sifted it, or packed it down. That variability multiplied across several ingredients in a recipe is the difference between a perfect bake and a disappointing one.

A kitchen scale also makes cleanup easier since you can weigh ingredients directly into the mixing bowl, zeroing the scale between each addition. No measuring cups to wash. If you are serious about improving your baking consistency, switching to a scale is the single most impactful change you can make. Our Cooking Converter can help you translate any volume-based recipe into weight measurements.

Butter Conversions: Sticks, Cups, Tablespoons, and Grams

Butter is one of the most frequently converted ingredients because US recipes use sticks (a uniquely American packaging format), while metric recipes use grams. The wrapper markings on US butter sticks make tablespoon measurements easy, but converting to grams requires knowing the numbers.

One thing to watch for: European butter has a higher fat content (82 to 86 percent) compared to standard US butter (80 percent). In most recipes the difference is negligible, but in laminated doughs like croissants or puff pastry, the higher fat content affects texture. If a French recipe specifies "beurre" without further detail, it assumes European-style butter.

Egg Size Substitutions

Recipes almost always call for "large" eggs, which is the USDA standard size weighing about 50 grams without the shell (approximately 57 grams with the shell). But grocery stores also sell medium, extra-large, and jumbo eggs, and using the wrong size can throw off a recipe, especially in baking where the liquid-to-dry ratio is critical.

When halving a recipe that calls for an odd number of eggs, beat the egg thoroughly, weigh it, and use half the weight. A beaten large egg weighs about 50 grams, so use 25 grams. This method is far more accurate than trying to eyeball half an egg.

Tips for Converting International Recipes

Converting a recipe from another country involves more than just swapping units. Different countries have different conventions that can trip you up if you are not aware of them.

Australian tablespoons are 20 ml, not 15 ml like US and UK tablespoons. If you are following an Australian recipe and it calls for 2 tablespoons of something, you need 40 ml, not 30 ml. This is a 33 percent difference that will be noticeable in baking.

UK recipes often use "caster sugar" (superfine sugar), which is finer than US granulated sugar. You can substitute regular granulated sugar in most recipes, but for delicate cakes and meringues, pulse your granulated sugar in a food processor for about 30 seconds to approximate caster sugar's finer texture.

Japanese and Korean recipes sometimes use the "go" or "cup" (180 ml), which is smaller than the US cup (237 ml). A Japanese rice cooker cup is 180 ml, which is important to know if you are following a rice recipe that specifies cups without noting the standard.

"A pinch" and "a dash" are not standardized, but in general a pinch is roughly 1/16 of a teaspoon (about 0.3 ml) and a dash is about 1/8 of a teaspoon (0.6 ml). When precision matters, use these approximations rather than guessing.

When in doubt, look for the gram weights in the original recipe. Many international recipe blogs now list both volume and weight measurements. If only volume is given, use the ingredient-specific weight chart above and weigh on a scale for the most reliable results. Our Recipe Scaler can also help when you need to adjust serving sizes while converting units simultaneously.

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The Bottom Line

Cooking measurement conversions boil down to three categories: volume (cups to milliliters), weight (ounces to grams), and temperature (Fahrenheit to Celsius). Volume conversions are fixed ratios that never change, weight conversions are a single multiplier (1 oz = 28.35 g), and temperature uses the formula (F minus 32) times 5/9. The real complexity comes from converting between volume and weight, because each ingredient has a different density. A cup of flour weighs 120 grams while a cup of sugar weighs 200 grams. Whenever possible, weigh your ingredients with a kitchen scale for consistent, repeatable results. Keep the reference charts from this guide handy, or bookmark our Cooking Converter for instant conversions anytime you need them.