Baking Measurement Converter
Convert a baking measurement between volume (cups, tablespoons) and weight (grams, ounces) using ingredient-specific density. Essential whenever a recipe gives volume but you need the precision of a scale for consistent baking results.
Last updated: May 2026
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About this calculator
The formula divides the source amount in milliliter equivalents (amount × fromUnit conversion to ml) by the target unit equivalent, scaled by ingredient density (grams per 240 ml — one US cup). The 240 reference reflects the US legal cup (240 ml; the US customary cup is 236.6 ml, but 240 is the standard for nutrition labeling and most recipe authors). Ingredient density is the key variable: 1 cup of all-purpose flour ranges 120–142 g depending on whether it is scooped, spooned, or sifted; 1 cup of granulated sugar is ~200 g; 1 cup of brown sugar packed is ~213 g; 1 cup of butter is 227 g; 1 cup of cocoa powder is ~85 g; 1 cup of water is 240 g. Volume measurement of flour is the single largest source of error in home baking — a tightly scooped cup can hold 50% more flour than a properly spooned and leveled cup, ruining ratios. Edge cases: zero amount produces zero; very small quantities (under 1 tsp) carry high percentage error in either system. Professional bakeries and most modern recipe authors specify gram weights for this reason; weighing is faster, cleaner, and far more reproducible than volume measurement. The "weigh, do not measure" principle especially applies to flour, cocoa, and powdered sugar (very compressible) and to liquids in small quantities where surface tension and meniscus matter.
How to use
Example 1 — Flour cups to grams. A recipe calls for 2.5 cups of all-purpose flour and you want grams. Using the King Arthur standard of 120 g per cup spooned and leveled: 2.5 cups × 120 g/cup = 300 g. ✓ Weigh 300 g on a scale instead of scooping; you will get the exact dough hydration the recipe author intended. If you "scoop and shake" instead, you may end up with 350–400 g — too much flour, producing a dry crumb. Example 2 — Butter tablespoons to grams. A recipe lists 6 tablespoons of butter. Butter density is 227 g per cup; 1 cup = 16 tablespoons, so 1 tablespoon = ~14.2 g. 6 × 14.2 = 85 g. ✓ For solid butter, cutting a 250 g block into 8 equal pieces gives ~31 g each, so 85 g is roughly 2.7 pieces — easier to weigh than to measure by tablespoon. US recipe sticks are 113 g each (½ cup); 85 g is ¾ of a stick, which most stick wrappers mark.
Frequently asked questions
Why is weighing flour so much more accurate than measuring by cup?
Flour is highly compressible — its density depends on how you put it in the measuring cup. A loose spoon-and-level fill yields ~120 g per cup; a firm scoop straight from the bag with a measuring cup yields 140–160 g per cup; a packed-and-tapped cup can exceed 180 g. That is a 50%+ range from the same measurement. Recipe authors who write "1 cup flour" expect one specific density — usually 120 g spoon-and-leveled — and most home bakers over-measure with scoop-and-pack, producing dense, dry results. A digital scale costs $15 and removes this entire error class. Professional recipe development always specifies weights; if a recipe gives both volume and weight, trust the weight. For US recipes that only give volume, search the author online — King Arthur uses 120 g/cup, America's Test Kitchen 142 g/cup, Joy of Cooking 137 g/cup. Pick one and stay consistent within a single recipe.
What are the standard cup-to-gram weights for common baking ingredients?
Use King Arthur reference values per US cup (240 ml) as your baseline. Flours: all-purpose 120 g, bread 120 g, whole wheat 113 g, cake 113 g. Sugars: granulated 198 g, brown sugar packed 213 g, confectioners 113 g. Fats and liquids: butter 227 g, vegetable oil 198 g, water and milk 240 g, honey 340 g, peanut butter 270 g. Powders and add-ins: cocoa Dutch-process 85 g, rolled oats 90 g, chocolate chips 170 g. Small measures per teaspoon: baking powder 4 g, baking soda 6 g, fine salt 6 g, kosher salt Diamond Crystal 3 g, kosher salt Morton 5 g, instant yeast 3 g. These are reference values; deviations of 5–10% across brands are normal. Salt weights vary dramatically by brand — Diamond Crystal kosher and Morton kosher differ nearly 2× by volume — so always check which brand the recipe assumes.
Should I convert all my recipes to weights?
Yes, if you bake regularly. The investment is small: a $15 digital scale, an hour to look up gram weights for your top 10 recipes once, and a few weeks to adjust mentally from "cups" to "grams." Benefits compound: faster prep (no measuring cups to wash, just tare the bowl and add each ingredient), better consistency (no scoop-vs-spoon error), easier scaling (multiply or divide grams directly, no fractional cup math), cleaner workspace, and recipes work reliably across kitchens. For cooking (non-baking), volume measurement is usually fine — pinches and dashes do not affect a stew. For baking, weights produce noticeably better results, especially for bread, pie crust, laminated doughs (croissant, puff pastry), and tender cakes where ratios matter. Most professional recipes published after 2015 give weights as the primary measurement.
What are the most common mistakes converting baking measurements?
The biggest is using a single conversion factor for all ingredients — flour and sugar have very different densities, so "1 cup = 240 g" is wrong for both (flour is 120 g, sugar is ~200 g). The second is using US cups when the recipe is from Australia, the UK, or Japan; an Australian cup is 250 ml, UK metric cup 250 ml, Japanese cup 200 ml. The third is converting volume of stick butter to grams using the wrong stick size — US sticks are 113 g (½ cup), but Australian and Indian butter sticks are different sizes. The fourth is ignoring the brand-specific salt issue — Diamond Crystal and Morton kosher salt differ by ~2× by volume but only ~15% by weight, so a recipe calling for "2 tsp kosher salt" needs to specify brand. The fifth is converting tiny amounts (under 1 g, like a pinch of yeast or salt) by weight when a measuring spoon is more practical at that scale. The sixth is failing to tare the bowl between additions when using a scale — weigh each ingredient cumulatively or individually with care.
When should I not use this converter?
Skip it for ingredients where the listed density does not apply: chopped vs whole nuts (chopped pecans pack tighter than halves), shredded cheese (depends on shred size), cooked vs raw rice (3:1 cooked vs raw weight ratio). It is the wrong tool for liquids measured at temperatures other than room temperature, since density varies with temperature (cold honey vs warm honey). Do not use it for ingredients that vary by brand (peanut butter consistency, salt crystal size, chocolate chip size); for these, check the recipe author's reference values or test with your specific brand. For very small measurements (under 5 g or 1 tsp), use measuring spoons rather than a scale — most home scales have ±1 g precision, which is significant at small quantities. And for recipes that specifically describe technique (a "scant cup," "heaping tablespoon"), the author is communicating texture or hydration intent that gram conversion may obscure; in those cases, follow the volume instruction.