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1/3 cups of powdered sugar in grams

1/3 cups of powdered sugar ≈ 40 grams

That is about 1.41 ounces. Also sold as icing or confectioners sugar. One US cup of powdered sugar weighs 120 g.

Why this number is approximate

Very light and prone to lumps. Sift before measuring if the recipe depends on a smooth result.

Powdered sugar conversion table

CupsGramsOuncesTablespoons
1/430 g1.06 oz4
1/340 g1.41 oz5.33
1/260 g2.12 oz8
2/380 g2.82 oz10.7
3/490 g3.17 oz12
1120 g4.23 oz16
1 1/2180 g6.35 oz24
2240 g8.47 oz32
2 1/2300 g10.6 oz40
3360 g12.7 oz48
4480 g16.9 oz64

Weigh it if you can

Volume measures are convenient but imprecise — the same cup can hold noticeably different amounts depending on how the ingredient is packed, how humid the room is, and whether it was sifted. A digital kitchen scale removes the variable entirely, which is why professional and European recipes give weights. If you bake regularly, a scale is the cheapest accuracy upgrade available.

Frequently asked questions

How many grams is 1/3 cups of powdered sugar?

About 40 grams, or 1.41 ounces.

How many grams in a cup of powdered sugar?

Roughly 120 grams per US cup.

Is a US cup the same as a metric cup?

No. A US customary cup is 236.6 ml; a metric cup — used in Australia, New Zealand and much of Europe — is 250 ml, about 6% larger. An imperial cup, still seen in older British recipes, is 284 ml. For a cup of powdered sugar that is a difference of roughly 6.8 g between US and metric.

Should I sift before or after measuring?

It matters, and recipes are often ambiguous. "1 cup sifted flour" means sift first, then measure — which gives less flour than "1 cup flour, sifted", where you measure first. When in doubt, weigh.

Other amounts

All powdered sugar conversions · All cooking conversions