Popcorn (air-popped): Grams to Cups
1 cup of popcorn (air-popped) = 8 grams
One US cup of popcorn (air-popped) weighs 8 grams. One 250 ml metric cup — the one used in the UK, Australia, New Zealand and Canada — holds 8 grams. To convert any weight, divide the grams by the figure for your cup.
A cup of air-popped popcorn weighs only 8 g (USDA FoodData Central, popcorn, air-popped). Oil-popped popcorn is heavier at 11 g a cup, because some of the oil stays on the kernels. That makes 1 ounce (28 g) of air-popped popcorn about 3½ cups. USDA weighs a regular microwave bag at 87 g of popped corn, about 11 cups at 7.9 g per cup.
Where the 8 g figure comes from
- USDA FoodData Central: 1 cup of “Snacks, popcorn, air-popped” = 8 g (FDC ID 167959)
This site uses 8 g per US cup of popcorn (air-popped), spooned and levelled. References checked September 2026.
How many cups is X grams of popcorn (air-popped)?
| Grams | US cups | Metric cups | Tablespoons | Ounces |
|---|---|---|---|---|
| 25 g popcorn (air-popped) | 3⅛ | 2.96 | 50 | 0.88 |
| 50 g popcorn (air-popped) | 6¼ | 5⅞ | 100 | 1.76 |
| 75 g popcorn (air-popped) | 9⅜ | 8⅞ | 150 | 2.65 |
| 100 g popcorn (air-popped) | 12½ | 11⅞ | 200 | 3.53 |
| 110 g popcorn (air-popped) | 13¾ | 13 | 220 | 3.88 |
| 120 g popcorn (air-popped) | 15 | 14¼ | 240 | 4.23 |
| 125 g popcorn (air-popped) | 15⅝ | 14¾ | 250 | 4.41 |
| 130 g popcorn (air-popped) | 16¼ | 15⅜ | 260 | 4.59 |
| 140 g popcorn (air-popped) | 17½ | 16.56 | 280 | 4.94 |
| 150 g popcorn (air-popped) | 18¾ | 17¾ | 300 | 5.29 |
| 170 g popcorn (air-popped) | 21¼ | 20⅛ | 340 | 6.00 |
| 175 g popcorn (air-popped) | 21⅞ | 20⅔ | 350 | 6.17 |
| 200 g popcorn (air-popped) | 25 | 23⅔ | 400 | 7.05 |
| 225 g popcorn (air-popped) | 28⅛ | 26⅝ | 450 | 7.94 |
| 240 g popcorn (air-popped) | 30 | 28⅜ | 480 | 8.47 |
| 250 g popcorn (air-popped) | 31¼ | 29⅝ | 500 | 8.82 |
| 275 g popcorn (air-popped) | 34⅜ | 32½ | 550 | 9.70 |
| 300 g popcorn (air-popped) | 37½ | 35½ | 600 | 10.58 |
| 350 g popcorn (air-popped) | 43¾ | 41⅜ | 700 | 12.35 |
| 400 g popcorn (air-popped) | 50 | 47⅓ | 800 | 14.11 |
| 450 g popcorn (air-popped) | 56¼ | 53¼ | 900 | 15.87 |
| 500 g popcorn (air-popped) | 62½ | 59⅛ | 1000 | 17.64 |
How to measure popcorn (air-popped) accurately
The 8 g figure assumes the spooned-and-levelled method: spoon the popcorn (air-popped) into a dry measuring cup and sweep the top flat with a straight edge. Scooping the cup through the bag compacts it and gives a heavier cup.
- 1 US cup of popcorn (air-popped) = 8 g
- 1 metric cup (250 ml) of popcorn (air-popped) = 8 g
- ¾ cup = 6 g
- ½ cup = 4 g
- ⅓ cup = 3 g
- ¼ cup = 2 g
- 1 tablespoon = 0.5 g
Frequently asked questions
How many cups is 100 grams of popcorn (air-popped)?
100 grams of popcorn (air-popped) is about 12½ US cups, based on 8 g per cup, or 11⅞ metric cups.
How many grams in a cup of popcorn (air-popped)?
One US cup of popcorn (air-popped) weighs 8 grams. A 250 ml metric cup holds 8 grams.
How many cups is 250 grams of popcorn (air-popped)?
250 grams of popcorn (air-popped) is about 31¼ US cups, or 29⅝ metric cups.
Does a UK cup of popcorn (air-popped) weigh the same as a US cup?
No. A UK, Australian or Canadian metric cup is 250 ml against the US 236.6 ml, so it holds about 5.7% more — 8 g of popcorn (air-popped) rather than 8 g.
How many tablespoons is 100 grams of popcorn (air-popped)?
100 grams of popcorn (air-popped) is about 200 tablespoons.
How many grams is 1 cup of popcorn?
8 grams for air-popped popcorn and 11 grams for oil-popped (USDA FoodData Central).
How many cups of popcorn are in 1 ounce?
About 3½ cups of air-popped popcorn (28.35 ÷ 8 = 3.54) or about 2½ cups of oil-popped (28.35 ÷ 11 = 2.58).
How many cups of popcorn are in a microwave bag?
About 11 cups. USDA weighs a regular microwave bag at 87 g of popped corn and 1 cup at 7.9 g, and 87 ÷ 7.9 = 11.
How many cups is 100 g of popcorn?
12½ cups of air-popped popcorn at 8 g per cup, or about 9 cups of oil-popped (100 ÷ 11 = 9.1).