8 Cups of Sugar in Grams

Eight cups of sugar is 1,600 grams

Eight US cups of granulated sugar weigh 1,600 g. The number comes straight from USDA FoodData Central record 169655, where the household measure for one cup of granulated sugar is 200 g, so 8 x 200 = 1,600. King Arthur Baking's ingredient weight chart puts the same cup at 198 g, which makes eight cups 1,584 g, a 16 g gap no recipe will notice.

In the units a US scale uses, 1,600 g is 1,600 / 28.3495 = 56.44 oz by weight and 1,600 / 453.592 = 3.53 lb. Volume and weight part ways here: eight cups is 64 fl oz of space, while the sugar itself weighs 56.44 oz.

Double, halve or quarter it and the pounds follow: four cups is 800 g, 28.22 oz and 1.76 lb.

A cup splits into 16 level tablespoons and 48 level teaspoons, so eight cups is 128 tablespoons and 384 teaspoons. Each tablespoon of granulated sugar weighs 200 / 16 = 12.5 g, and 128 x 12.5 = 1,600 g, the same number by a different road. Each teaspoon is 200 / 48 = 4.17 g, which is where the 4 g on a nutrition label comes from.

One 4 pound bag holds 9.07 cups

Sugar sells by weight and recipes ask by volume, so bag math matters at eight cups. A 4 lb bag is 4 x 453.592 = 1,814 g, and 1,814 / 200 = 9.07 cups of granulated sugar. Eight cups needs 1,600 g, so one 4 lb bag covers the batch and leaves 214 g, just over a cup, in the bag.

Go smaller and the math turns. A 1 lb box is 453.6 g, which is 2.27 cups, so eight cups takes 3.53 boxes and four whole boxes leave 214 g on the shelf. A 5 lb bag is 2,268 g, or 11.34 cups, enough for one batch with 3.34 cups left, and a 10 lb sack is 4,536 g, or 22.68 cups, enough for two eight cup batches with 6.68 cups to spare.

Cost follows the same lines. At $1.20 a pound, the 3.53 lb that eight cups weigh costs 3.53 x 1.20 = $4.24. A 10 lb sack at the same shelf rate is $12.00 for 22.68 cups, which is 12 / 22.68 = $0.53 a cup, the same as the small bag. Big bag savings come from the shelf price, not the arithmetic.

The same eight cups runs from 800 g to 1,760 g

Every row in this table is eight US cups of 236.588 mL. What changes is the sugar inside. USDA record 168833 lists brown sugar at 220 g a cup packed and 145 g loose, and record 169656 lists powdered sugar at 120 g unsifted and 100 g sifted. Multiply by eight and the spread runs from 800 g to 1,760 g for the same volume.

The mechanism is air. Granulated sugar packs to 200 / 236.588 = 0.85 g per mL, firmly packed brown sugar to 220 / 236.588 = 0.93 g per mL, and unsifted powdered sugar only to 120 / 236.588 = 0.51 g per mL. Sifting powdered sugar knocks air out of the cup, and eight cups drop from 960 g to 800 g, a 160 g gap. Packing brown sugar does the opposite: packed against loose, eight cups differ by 1,760 - 1,160 = 600 g.

Eight cups of sugar makes a gallon of simple syrup

Simple syrup is where eight cups shows up most often. Equal volumes, eight cups of sugar and eight cups of water, give 1,600 g of sugar and 8 x 236.588 = 1,893 g of water. Since 1,600 + 1,893 = 3,493 g, the sugar is 1,600 / 3,493 = 45.8 percent of that syrup by weight.

Equal weights are a different syrup. 1,600 g of sugar and 1,600 g of water make 3,200 g at exactly 50 percent, and the two pour differently in a drink or a sorbet.

Lemonade works off cups. At the common one cup per gallon, eight cups sweeten eight gallons, since 1,600 / 200 = 8. In a two gallon pitcher, 1,600 g spread over 32 cups is 1,600 / 32 = 50 g of sugar a cup, about 193.5 calories per 8 oz glass. Cut the sugar to four cups, 800 g, and the same glass drops to 25 g and 97 calories.

Sweet tea sits at the top of the range. In four gallons, or 64 cups, 1,600 g works out to 1,600 / 64 = 25 g a cup and 97 calories per 8 oz glass. Halve the sugar and the tea carries 12.5 g a cup, one level tablespoon.

6,192 calories and 1,596.8 grams of carbohydrate

Record 169655 lists granulated sugar at 387 kcal and 99.8 g of carbohydrate per 100 g. Eight cups at 1,600 g is 1,600 x 3.87 = 6,192 calories and 1,600 x 0.998 = 1,596.8 g of carbohydrate, close to all of it sucrose. That is 6,192 / 2,000 = 3.1 days of a 2,000 calorie diet.

Brown sugar is not lighter in any useful way. USDA lists it at 380 kcal per 100 g in record 168833, so eight packed cups at 1,760 g carry 1,760 x 3.8 = 6,688 calories, 496 more than the granulated batch.

Frosting, caramel and a 6 quart pot

A big buttercream starts with eight cups of powdered sugar, 960 g unsifted, plus 2 cups of butter at 227 g a cup, 454 g. The bowl holds 960 + 454 = 1,414 g of frosting, which pipes 24 cupcakes at 1,414 / 24 = 58.9 g each.

Caramel is the one place eight cups of dry sugar goes into a single pot. Eight cups of granulated sugar take up 1,893 mL, and a 6 quart pot holds about 5,678 mL, so the dry sugar sits at one third of the pot and leaves headroom for the foam. In a 4 quart pot the same sugar fills 1,893 / 3,785 = half the pot, and a boilover is one distracted minute away.

Syrup for brushing layer cakes scales down the same way. The full batch is 1,600 g of sugar and 1,600 g of water, and 400 g of each makes 800 g of 50 percent syrup, enough for six 8 inch layers.

Why eight cups doubles your scooping error

A cup of sugar scooped straight from the bag can weigh 220 g, and a cup spooned and leveled can sit near 180 g. At one cup that is a 40 g window. At eight cups the same hand habit moves the batch between 8 x 180 = 1,440 g and 8 x 220 = 1,760 g, a 320 g spread, the weight of a cup and a half. It is why a doubled recipe can taste different from two single batches.

A scale settles it in one move. Put the bowl on the scale, press tare, and pour to 1,600 g. If the bowl is small, weigh 800 g twice and stir between pours. Most home scales read to 1 g up to 5 kg, so a 1,600 g batch sits well inside the range with room to spare.

A wrapped stick of butter reads 113 g, and 1,600 g is a bit more than 14 sticks, which a 5 kg scale handles with a large bowl. A 2 kg scale will not hold 1,600 g plus the bowl, so keep the bigger range for batch work.

Double the batch again and the target is 16 cups, or 3,200 g. Past that, weigh in 1,600 g lots and count them.

Grams back to cups at batch size

The reverse is one division. For granulated sugar the divisor is 200, so 1,600 / 200 = 8 cups, 1,000 / 200 = 5 cups and 500 / 200 = 2.5 cups. For packed brown sugar the divisor is 220, so 1,600 g is 1,600 / 220 = 7.27 cups. For unsifted powdered sugar it is 120, so 1,600 g is 1,600 / 120 = 13.33 cups.

The converter above runs both directions at batch size. It opens at eight cups and 1,600 g for granulated sugar. Type 1,600 into the grams box to read 8 cups, or switch the menu to firmly packed brown sugar and the same 1,600 g turns into 7.27 cups.