How much is a cup of flour in grams?

It varies depending on the source. King Arthur's unbleached AP flour is 120 grams

Arrowhead Mills organic AP flour is 120 grams for 1 cup.
Pillsbury flour is 124 grams in one cup.
Look at the nutritional information on the side of the package. It will usually list 1/4 C = xxx grams.

However, a lot of pastry chefs have their own values they've used to develop their own pastries. Joanna Chang uses 140 grams for AP flour and 150 grams for bread flour.

Rose Levy Beranbaum goes the full mile and lists the following for all-purpose flour
SIFTED = 3.5 OUNCES = 114 GRAMS
LIGHTLY SPOONED = 4.25 OUNCES = 121 GRAMS
DIP AND SWEEP = 5 OUNCES = 145 GRAMS

If I'm following a recipe with given weights (God Bless those authors), I follow their given weights.

If you go to King Arthur's recipe site, you can click a button and convert the recipe using:
cups
grams
ounces

 
If you google how much is a cup of flour you get a bunch of different results. This person

weighted 192 cups of flour just to show you how much of work he did to show us the results.

 
It also depends on the container you're using as a *cup* measurement. Mom had a few

random plastic measuring cups and I had a metal NorPro set. I was trying to work out the flour adjustments for my grandmother's sweet bread and one cup of flour displayed three different weights using three different measuring cups.

 
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