how to convert… · baking
How do I convert cups to grams for flour?
1 cup all-purpose flour = 120 grams (King Arthur Baking standard). 1 cup bread flour = 120g. 1 cup whole wheat = 113g. 1 cup cake flour = 114g. 1 cup almond flour = 96g. Always weigh, not measure by cup — scoop-and-sweep cups can vary 25%+ between bakers, ruining recipes.
The full answer
Why this conversion matters more than any other
Flour is the most-measured ingredient in baking and the most-variable when measured by volume. The same "1 cup" of flour can weigh anywhere from 110g (sifted, spooned-and-leveled) to 170g (dipped + packed) depending on technique. This 50% variability is why the same recipe from the same book produces wildly different results between bakers. Weighing flour eliminates this entirely. Every published cookbook author who tests on multiple bakers (King Arthur, Cook's Illustrated, Stella Parks at Serious Eats) advocates weight-not-volume for flour.
Canonical conversions (King Arthur Baking standard)
| Flour type | 1 cup = | Note |
|---|---|---|
| All-purpose flour | 120g | most-common, neutral baseline |
| Bread flour | 120g | same volume-weight as AP despite higher protein |
| Whole wheat flour | 113g | slightly less dense than white |
| White whole wheat | 113g | same as whole wheat |
| Pastry flour | 113g | lower protein, slightly less dense |
| Cake flour | 114g | very fine, slightly less dense than AP |
| Self-rising flour | 113g | AP + baking powder + salt blend |
| 00 pizza flour | 130g | Italian pizza flour, denser grind |
| Semolina flour | 167g | very dense, golden Italian wheat |
| Almond flour | 96g | nut-based, much lower density |
| Coconut flour | 130g | very absorbent, dense |
| Buckwheat flour | 120g | gluten-free, similar to AP |
| Rice flour (white) | 158g | dense, common in GF baking |
| Tapioca flour | 120g | starch, similar weight to AP |
| Rye flour (medium) | 102g | less dense than wheat |
| Spelt flour | 120g | ancient wheat, similar to AP |
Why all-purpose = 120g specifically
The 120g/cup number is King Arthur Baking's published standard. They reached it by: - Spooning flour into a dry measuring cup - Leveling with the back of a knife - Weighing on a calibrated scale - Averaging 10 trials per technique × 5 bakers
Other published references (Stella Parks/Serious Eats: 130g; Cook's Illustrated: 142g) reflect different scoop techniques. King Arthur's 120g represents the "spoon-and-sweep" gentlest fill, which is what most modern recipes assume. If your recipe is from a source using 130g or 142g, use those — recipes are internally consistent.
Conversion math (for any cup-based recipe)
If your recipe says "3 cups AP flour": - Multiply by 120: 3 × 120 = 360g - Weigh 360g on a kitchen scale (digital, 1g resolution recommended) - Skip measuring cups entirely
Reverse direction (when buying flour by weight to recipe-test)
- 1 lb (454g) bag of AP flour = 3.8 cups (454 ÷ 120)
- 5 lb (2270g) bag = 18.9 cups
- 1 kg bag = 8.3 cups
- 1 oz (28g) = 0.23 cup
Common rookie mistakes
- Packing flour into the cup: never. Even gentle packing adds 15-20g per cup.
- Dipping the cup into the bag: compresses flour, adds 20-30g per cup. Wrong.
- Sifting before measuring vs after: matters — "1 cup sifted flour" (sift first, then measure) is lighter than "1 cup flour, sifted" (measure, then sift). Read recipes carefully.
- Using AP weight (120g) for whole wheat: whole wheat is less dense; use 113g. Otherwise you over-measure by ~6%.
- Confusing dry/wet measuring cups: dry cups fill to brim; liquid cups have a meniscus + offset. Always use dry cups for flour.
Cross-reference: see /pages/how-to-convert/cups-to-grams-sugar for sugar conversions + /pages/what-ratio-of/water-to-flour-bread for hydration math.
Time ranges by condition
| Condition | Duration | Note |
|---|---|---|
| All-purpose flour | 120g per cup | King Arthur standard |
| Bread flour | 120g per cup | — |
| Whole wheat flour | 113g per cup | — |
| Cake flour | 114g per cup | — |
| Almond flour | 96g per cup | — |
| Coconut flour | 130g per cup | — |
| 00 pizza flour | 130g per cup | — |
| Rice flour (white) | 158g per cup | — |
What changes the time
- Flour source. Different brands publish different cup-weight standards (KA 120g vs Serious Eats 130g vs CI 142g)
- Scoop technique. Spoon-and-sweep vs dip-and-pack varies the SAME cup by 25-30%
- Humidity. Hygroscopic flours (whole wheat, rye) absorb moisture and weigh more in humid kitchens (+2-4%)
- Sifted vs unsifted. Sifted flour weighs 15% less per cup; matters for cake recipes
Common questions
Why do different sources give different cup-to-gram conversions for flour?
Three different cup-fill techniques: spoon-and-sweep (King Arthur: 120g) gently fills with a spoon then levels; dip-and-sweep (Cook's Illustrated: 142g) packs flour by dipping the cup into the bag; aerated-and-sifted (some baking books: 100-110g) lifts flour with a fork first. Each technique is internally consistent, so recipes work IF you use the same technique as the author. The safest approach: weigh in grams.
My recipe is in cups but I have a kitchen scale — should I use weight?
Yes — weight is more precise and produces consistent results. Use 120g/cup for AP flour if the recipe is from a modern source (post-2010 American cookbooks mostly use King Arthur's 120g). If results are wrong, increase to 130-142g/cup and retest — older or European recipes may use different standards. For sugar, butter, and liquid ingredients, weight conversions are universally consistent (sugar = 200g/cup regardless of source).
Do I need a fancy scale?
No — a basic digital kitchen scale ($10-30) works perfectly. Look for: 1-gram resolution (for small ingredients), 5kg capacity (for large batches), tare function (zero out container weight), gram + ounce display. The Escali Primo and OXO 11-lb scales are widely-recommended budget picks. Skip analog spring scales — too imprecise for baking.
Sources
We cite primary research, expert practice, and authoritative reference. Higher-tier sources weighted heavier. See methodology.
- T2King Arthur Baking flour weight chart — Canonical published reference for AP=120g + all wheat varieties
- T2America's Test Kitchen, "The Science of Good Cooking" — Tested cup-vs-weight variability; documented 25-30% variance
- T2Stella Parks, "BraveTart" / Serious Eats — Why weight beats volume for baking precision; advocates 130g/cup
- T2Cook's Illustrated baking weight reference — Uses 142g/cup convention based on dip-and-sweep
- T1USDA FoodData Central, flour reference — Density reference for all major flour varieties
Cite this page
de Vries, P. (2026). How do I convert cups to grams for flour?. AskedWell. Retrieved 2026-05-21, from https://askedwell.com/pages/how-to-convert/cups-to-grams-flour
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