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Measuring flour: why the weight of a cup varies

A cup measures volume; a scale shows mass. How you fill the cup changes the space the flour takes up. If the recipe gives grams, weigh them directly. If it gives cups, check their capacity and follow the method specified by its author.

Three flour-measuring steps: weigh on a scale, spoon into a cup, then level off the top.
Original diagram of the methods: weighing in grams, gently filling a cup and levelling it off.

Weigh when the recipe gives grams

Put the container on the scale, select grams and tare. The display returns to zero: you can add flour without including the container’s weight.

For 150 g of flour, stop at 150 g after taring. No need to convert to cups: the scale has already done its share of the work.

Fill gently when the recipe gives cups

Use a dry measuring cup with the capacity specified by the recipe. Spoon in the flour without pressing. Scooping directly from the bag or tapping the cup can pack it: more flour then fits in the same volume.

  1. Check the cup’s capacity and the amount required by the recipe.
  2. Gently stir the flour in its container with a spoon to loosen it.
  3. Spoon flour in until it rises slightly above the rim, without pressing.
  4. Draw a straight edge across the top to remove the excess: this is levelling off.
  5. Use the level measure without adding a little mound of flour.

Understand what a cup of flour represents

The Cookiosity converter uses 120 g per US cup for King Arthur Baking’s all-purpose flour. This reference does not guarantee the weight of your flour or automatically match a specific local type, such as French T55.

Check the vessel too: a 250 ml cup does not hold the same volume as a US cup. A local flour name alone does not establish a match with the flour in an American recipe.

What weights do the sources give for a cup?

Here are the references published by King Arthur Baking and Sally’s Baking for all-purpose flour, with their respective contexts.

Three published values and their context
Filling contextMass per cupSource
Flour loosened, spooned in and levelled offAbout 120 gKing Arthur Baking
Spooned in and levelled off, the author’s reference125 gSally’s Baking
More densely packed flourCan reach 160 gKing Arthur Baking

These references do not come from one series of weighings. The high value cited for more densely packed flour is not a universal maximum.

Why do these references differ?

More tightly packed flour leaves less air between the particles, so more fits in the same volume. Levelling smooths the top but does not undo packing.

The 5 g difference between the two references does not isolate its cause. Averaging them would not give a value representing all flours.

The high value in the table does not automatically mean scooping directly or tapping a specific number of times. It is not a weight to aim for at every measure.

Which value should you use for your recipe?

Follow the recipe’s weight when provided. Otherwise, look for its author’s cup convention and filling method rather than adopting another website’s reference.

The converter uses King Arthur Baking’s reference. The table’s other values explain conversion limits; they are not extra calculator settings. To change servings, start from known amounts without repeatedly converting the same measure.

Keep the useful method close at hand

The flour is measured: return to the recipe and prepare the next steps before heating.

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