100 grams of all-purpose flour is approximately 0.8 cups, which is about 45\tfrac{4}{5}54​ cup or “a scant cup.”

Quick Scoop: 100g Flour → Cups

  • For all-purpose flour :
    • 100 g ≈ 0.8 cups (about 4/5 cup, or just under a full cup).
  • Many baking converters assume around 120–125 g per cup of flour, which is why 100 g lands a bit under 1 cup.

Simple rule of thumb

If you ever need to estimate fast:

  • 1 cup all-purpose flour ≈ 120–125 g.
  • So to convert grams to cups, you can think:
    • cups ≈ grams ÷ 120–125.

For your specific question “how many cups of flour is 100g,” using those common standards gives the widely used answer of about 0.8 cups (4/5 cup) of all-purpose flour.

Information gathered from public forums or data available on the internet and portrayed here.