Baking Measurement Conversions: The Complete Guide to Accurate Baking

Updated March 2026 · By the KitchenCalcs Team

Baking is chemistry, and chemistry demands precision. A cup of flour can weigh anywhere from 120 to 160 grams depending on how you scoop it — a 33 percent variance that can mean the difference between a tender cake and a dense brick. Professional bakers weigh everything for this reason, and once you understand the conversion between volume and weight measurements, you will too. This guide covers the conversions you actually need, explains why weight matters more than volume, and gives you the reference charts that belong on every baker's refrigerator.

Why Volume Measurements Fail in Baking

A cup is a measure of space, not substance. When you scoop a cup of flour directly from the bag, you pack the flour and trap air unevenly. The result varies by 20 to 30 percent depending on technique, humidity, and whether the flour was recently sifted. King Arthur Baking has demonstrated that a cup of all-purpose flour can weigh 120 grams (spooned and leveled) or 160 grams (scooped and packed). That 40-gram difference in a recipe calling for 3 cups is nearly an extra half cup of flour.

Liquids are more consistent in volume measurements because they self-level, but even here, the meniscus reading and measuring cup accuracy introduce small errors. For casual cooking, these variations are negligible. For baking — where ratios of flour to liquid to fat to leavening must be precise — they compound and cause failures that bakers blame on oven temperature, altitude, or bad luck when the real culprit is measurement inconsistency.

Essential Weight Conversions for Baking

The foundation of accurate baking is knowing the weight of common ingredients per cup. All-purpose flour: 120 grams per cup (spooned and leveled). Granulated sugar: 200 grams per cup. Brown sugar (packed): 220 grams per cup. Butter: 227 grams per cup (2 sticks). These four ingredients appear in the vast majority of baking recipes, and knowing their weights eliminates the most common source of error.

Other critical conversions: powdered sugar is 120 grams per cup, cocoa powder is 85 grams per cup, bread flour is 130 grams per cup, and cake flour is 114 grams per cup. Note that different flours have different weights per cup — this is why converting a recipe from volume to weight requires ingredient-specific conversions, not a single universal factor.

• All-purpose flour: 1 cup = 120g (spooned and leveled)
• Bread flour: 1 cup = 130g
• Cake flour: 1 cup = 114g
• Granulated sugar: 1 cup = 200g
• Brown sugar (packed): 1 cup = 220g
• Powdered sugar: 1 cup = 120g
• Butter: 1 cup = 227g (2 sticks)
• Cocoa powder: 1 cup = 85g

Volume-to-Volume Conversions

Even when weighing, you still need volume conversions for small quantities where a scale is not precise enough. One tablespoon equals 3 teaspoons. One cup equals 16 tablespoons. One fluid ounce equals 2 tablespoons. These relationships are fixed and reliable because they are pure volume ratios.

Metric-to-imperial conversions come up frequently with international recipes. One cup equals approximately 237 milliliters (often rounded to 240 mL for practicality). One tablespoon is about 15 mL. One teaspoon is about 5 mL. One liter is approximately 4.23 cups. Keep these on hand when following recipes from British, Australian, or European sources.

Converting Recipes Between Systems

When converting a volume-based recipe to weight, do not simply look up each ingredient individually — verify that the ratios make sense. A standard butter cake uses roughly equal weights of flour, sugar, butter, and eggs. If your conversion produces 500 grams of flour but only 200 grams of sugar, something is off. Use baker's percentages (where flour is always 100 percent) to sanity-check your conversions.

When scaling recipes up or down, weight-based measurements scale linearly and accurately. Volume measurements introduce compounding errors at larger scales. A recipe that works at 1x might fail at 3x because the flour measurement error triples. This is why commercial bakeries work exclusively in weights — and why converting your favorite recipes to weight measurements pays dividends every time you bake.

Egg and Butter Equivalents

Eggs are one of the few ingredients where count-based measurement works well because eggs are naturally standardized by size. A large egg weighs about 50 grams total (without shell), with approximately 30 grams of white and 20 grams of yolk. When a recipe calls for eggs and you only have a different size, use weight: 3 large eggs (150g) can be replaced by 4 medium eggs or 2 extra-large eggs, adjusted to match the total weight.

Butter conversions are straightforward once you know the standard. One stick of butter is 113 grams, 8 tablespoons, or half a cup. European-style butter has slightly higher fat content (82 to 86 percent vs 80 percent for American butter), which can affect very delicate pastries. For most baking, the difference is negligible, but for laminated doughs like croissants, European butter's higher fat and lower water content makes a noticeable difference in flakiness.