KitchenWeightCalc
Tools

⅓ US Cup Light Brown Sugar = 66.7g

⅓ US Cup of light brown sugar weighs 66.7 grams (2.35 ounces or 0.15 pounds; 78.9 mL or 5.33 tablespoons in volume) when measured firmly packed at a verified bulk density of 200g per 236.6 mL US Customary cup.

Imperial weight: 2.35 oz (0.15 lb) • Volume: 78.9 mL (5.33 tbsp)

Batch
Measuring density
Converted Measure
0.33 US cup Light Brown Sugar (firmly packed) =
66.7 g
Physical scoop breakdown0.33 cups
1/3 cup
Edit either side to reverseLight Brown Sugar chart →
Grams
66.7 g
Ounces
2.35 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 (200g/cup). Switching to loosely spooned (unpacked) (145g/cup) changes each cup by 55g—use the packing toggle on the scale bench to match your recipe.

Batch Scaling Around ⅓ US Cup Light Brown Sugar

Batch scaling conversion table around ⅓ US Cup of Light 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×) 33.3g (1.18 oz) 2 tbsp + 2 tsp 39.4 mL
Standard (1×) 66.7g (2.35 oz) ⅓ cup 78.9 mL
1.5× Batch 100g (3.53 oz) ½ cup 118.3 mL
Double Batch (2×) 133.3g (4.7 oz) ⅔ cup 157.7 mL
Triple Batch (3×) 200g (7.05 oz) 1 cup 236.6 mL

Measuring ⅓ US Cup of Light Brown Sugar in the Kitchen

Measured firmly packed at a verified bulk density of 200g per US cup, ⅓ US cup of light brown sugar weighs 66.7 grams (2.35 ounces). Measured using the loosely spooned (unpacked) method (145g/cup), that same ⅓ cup holds 48.3g — a 18.3g difference in your mixing bowl.

Press sugar firmly into the dry measuring cup with your fingers or a spoon until it holds the shape of the cup when inverted.

Source note: USDA FoodData Central #169656 & Domino Sugar standard packed weight

Frequently Asked Questions

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

⅓ US Cup of light brown sugar measured firmly packed weighs 66.7 grams (2.35 ounces).

Why must brown sugar always be firmly packed into the cup? ▾

Molasses film creates friction that traps irregular air pockets; packing eliminates voids to give consistent weight.

How can you soften rock-hard brown sugar quickly? ▾

Microwave in a bowl covered with a damp paper towel in 20-second bursts to restore humidity quickly.