Cups to Grams Converter

Amount

From

Ingredient

A cup of flour weighs 125 g and a cup of honey weighs 340 g. Weight and volume cannot be converted without knowing what is being measured.

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Answer

125g

1 US cup of plain / all-purpose flour weighs 125 g

What each figure is

A weight and a volume are different kinds of quantity. These are the numbers that connect them.

What you enteredYou chose thisthe figure in cups (us, 236.6 ml)1 US cup
The ingredientYou chose thiswithout this the question has no answer — see belowPlain / all-purpose flour
What it weighs125 g per US cup, or 0.5283 g per millilitre0.5283 g/ml
The two sides in common unitsthe weight and the space it occupies, which is what density connects125 g = 236.588 ml
The answerthe same plain / all-purpose flour, measured in grams125 g

About this figure

Published figures run 120–130 g per cup depending on whether the flour is spooned in or scooped. Weigh it if the recipe is fussy.

How that was worked out

Each step, and why it is that step.

Step 1 — Get the volume into millilitres
1 US cup × 236.588 ml = 236.588 ml
One US cup holds 236.588 ml. Density is quoted per millilitre, so that is where both sides have to meet.
Step 2 — Multiply by the density
236.588 ml × 0.5283 g/ml = 125 g
Plain / all-purpose flour weighs 0.5283 g per millilitre, so that many millilitres weigh this much.

Check it backwards: 125 g ÷ 0.5283 g/ml = 236.588 ml = 1 US cup

The mistake this prevents

A converter that ignores the ingredient treats every millilitre as a gram, and would tell you 236.588 g — out by 89.3%. Plain / all-purpose flour is lighter than water, and the gap is the whole reason this field exists.

Check this before you rely on it. A free everyday calculator, provided as a guide — not tax, accounting, financial or legal advice. The working is shown above so you can verify it against your own figures. See our terms of use.

How it works

STEP 1

Say how many cups

Fractions are fine — type 0.5 for half a cup, 1.5 for a cup and a half. Tablespoons and teaspoons are in the same list if the recipe uses those.

STEP 2

Say which cup

A US cup is 236.6 ml; a metric cup — UK, Australian, New Zealand, Canadian — is 250 ml. American recipes mean the first. Both are listed under their own headings.

STEP 3

Choose the ingredient

The converter multiplies the volume by that ingredient’s density to get a weight, and shows both numbers so you can see where the answer came from.

What this doesn't cover

Knowing where a calculator stops is what makes the rest of it trustworthy.

A cup of butter comes from the wrapper, not the measuring jugOne US cup of butter is quoted as 227 g because that is two sticks — half a pound — which is how American butter is sold and scored. Measured by actual density it would be a little less. The recipe means the stick.

Packing changes the answerBrown sugar is assumed packed, as recipes nearly always mean; loose it is nearer 145 g per cup than 220. Flour varies about 8% with how it was put in the cup. Where a figure carries a caveat like this, the page says so next to it.

Common questions

How many grams is 1 cup of flour?

125 g for a US cup of plain flour, or about 132 g for a 250 ml metric cup. Bread flour is slightly heavier at 127 g per US cup and wholemeal heavier again at 130.

How many grams is 1 cup of sugar?

200 g of granulated or caster sugar in a US cup. Brown sugar packed is 220 g, and icing sugar is much lighter at 120 g because it is mostly air.

How many grams is 1 cup of butter?

227 g — two American sticks, or half a pound. That is the convention recipes are written against.

Is a US cup the same as a UK cup?

No. A US cup is 236.6 ml and a metric cup, used in the UK, Australia, New Zealand and Canada, is 250 ml — about 5.7% bigger. Both are written "1 cup", so check where the recipe came from.

Why do American recipes use cups at all?

Volume measures need no scales, which mattered a great deal before kitchen scales were cheap. The cost is precision: the same cup of the same flour can vary by 8% depending on how it was filled, which is why professional baking recipes are written in grams.

Can I convert cups to grams without knowing the ingredient?

Not honestly. A cup of cocoa powder is 85 g and a cup of honey is 340 g — four times as much, from the same cup. Any converter that answers without asking is assuming water and will be wrong for almost everything.