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⅓ US Cup Dark Brown Sugar = 71g

⅓ US Cup of dark brown sugar weighs 71 grams (2.5 ounces or 0.16 pounds; 78.9 mL or 5.33 tablespoons in volume) when measured firmly packed at a verified bulk density of 213g per 236.6 mL US Customary cup.

Imperial weight: 2.5 oz (0.16 lb) • Volume: 78.9 mL (5.33 tbsp)

Batch
Measuring density
Converted Measure
0.33 US cup Dark Brown Sugar (firmly packed) =
71 g
Physical scoop breakdown0.33 cups
1/3 cup
Edit either side to reverseDark Brown Sugar chart →
Grams
71 g
Ounces
2.5 oz
US Cups
⅓ cup
Metric (250mL)
0.32 c
Tablespoons
5.33 tbsp
Milliliters
78.9 mL

Kitchen note: Test-kitchen baseline uses firmly packed (213g/cup). Switching to unpacked / loose (150g/cup) changes each cup by 63g—use the packing toggle on the scale bench to match your recipe.

Batch Scaling Around ⅓ US Cup Dark Brown Sugar

Batch scaling conversion table around ⅓ US Cup of Dark Brown Sugar (0.5× to 3× recipe batches in grams, ounces, US cups, and milliliters)
Batch Scale Weight (g / oz) US Cups & Spoons Metric (mL)
Half Batch (0.5×) 35.5g (1.25 oz) 2 tbsp + 2 tsp 39.4 mL
Standard (1×) 71g (2.5 oz) ⅓ cup 78.9 mL
1.5× Batch 106.5g (3.76 oz) ½ cup 118.3 mL
Double Batch (2×) 142g (5.01 oz) ⅔ cup 157.7 mL
Triple Batch (3×) 213g (7.51 oz) 1 cup 236.6 mL

Measuring ⅓ US Cup of Dark Brown Sugar in the Kitchen

Measured firmly packed at a verified bulk density of 213g per US cup, ⅓ US cup of dark brown sugar weighs 71 grams (2.5 ounces). Measured using the unpacked / loose method (150g/cup), that same ⅓ cup holds 50g — a 21g difference in your mixing bowl.

Pack firmly into the measuring cup to press out all air pockets. Dark brown sugar contains approximately 6.5% molasses, making it denser and stickier than light brown sugar.

Source note: King Arthur Baking standard (213g/cup packed) & USDA FDC #169657

Frequently Asked Questions

How many grams is ⅓ cup of dark brown sugar? ▾

⅓ US Cup of dark brown sugar measured firmly packed weighs 71 grams (2.5 ounces).

What is the culinary difference between light and dark brown sugar? ▾

Dark brown sugar has nearly double the molasses content, imparting deeper caramel flavor, darker color, and higher acidity.

Can I swap dark brown sugar for light brown sugar 1:1 by weight? ▾

Yes, substitute gram for gram; recipes will bake with slightly more moisture and a pronounced molasses aroma.