How to Convert Grams to Cups (and Cups to Grams)

Grams measure weight and cups measure volume, so there is no single conversion: a cup of flour weighs much less than a cup of sugar. You need one fact for each ingredient, how many grams are in one cup, and then it is a division.

For learning and kitchen practice. Cup weights are typical values, not exact. For doneness, use a food thermometer and safe internal temperatures, not cooking time alone.

Try it with your own problem ↓

The steps

Look up the grams in one cup of the ingredient. Typical values: all-purpose flour about 125 g, granulated sugar 200 g, butter 227 g, water 237 g.
Grams to cups: divide the grams by the grams per cup.
Cups to grams: multiply the cups by the grams per cup.
Turn the decimal into a measuring-cup amount: 0.5 = 1/2, 0.75 = 3/4, 0.33 ≈ 1/3.
For small amounts, use tablespoons: 1 cup = 16 tbsp.

A worked example

A recipe calls for 300 g of granulated sugar. How many cups is that?

The fact: 1 cup of granulated sugar ≈ 200 g.
Divide: 300 ÷ 200 = 1.5 cups.
As a measure: 1.5 = 1 1/2 cups.
Check: 1 1/2 × 200 = 300 g. ✓

300 g of sugar is about 1 1/2 cups.

Why it works

Cups and grams measure different things, so the bridge between them is how much one cup of the ingredient weighs, its density. Once you know a cup of sugar weighs 200 g, the question “how many cups is 300 g?” becomes “how many 200s fit into 300?”, which is division.

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Common mistakes

Using one number for everything. 300 g of flour is about 2.4 cups (300 ÷ 125), not 1 1/2.
Scooping the flour. Scooping packs it, and a scooped cup can weigh 150 g. Spoon it in and level it, or better, weigh it.
Mixing up fluid ounces and ounces. A fluid ounce measures volume; an ounce on a scale measures weight.
Expecting exact answers. Charts differ (some use 120 g for a cup of flour). They are typical values.

Questions people ask

How many cups is 250 g of flour?

At 125 g a cup, 250 ÷ 125 = 2 cups.

How many grams is a stick of butter?

A US stick is 1/2 cup, about 113 g (half of 227 g).

How many grams are in 2 cups of sugar?

2 × 200 = 400 g.

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