Produce
Corn Kernels Conversion
Corn Kernels weighs 165g per US cup.
| Amount | Grams | Ounces |
|---|---|---|
| 1 cup | 165.0 g | 5.82 oz |
| 1/2 cup | 82.5 g | 2.91 oz |
| 1/4 cup | 41.3 g | 1.46 oz |
| 1 tbsp | 10.3 g | 0.36 oz |
| 1 tsp | 3.4 g | 0.12 oz |
| 100 g | 100.0 g | 3.53 oz |
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Corn kernels weigh 165 grams per cup, whether cut fresh from the cob, thawed from frozen, or drained from a can, though this site's figure reflects fresh or thawed kernels specifically, since canned corn's added liquid can shift the practical measured weight somewhat.
Fresh sweet corn's sugar content genuinely starts converting to starch the moment it's picked, which is the real basis behind the old folk advice to eat corn the same day it's harvested — modern sweet corn varieties have been bred specifically to slow that sugar-to-starch conversion compared to older varieties, extending how long corn stays genuinely sweet after picking, though it still declines faster than most vegetables.
That fast post-harvest decline is exactly why fresh cut corn kernels have one of the shorter fridge windows among this site's produce entries — just 1-2 days — while frozen corn (flash-frozen shortly after harvest, similar to frozen peas) sidesteps that decline almost entirely and holds its quality for up to a year.
Corn kernels' cup weight (166g) applies to fresh or thawed-from-frozen kernels fairly consistently, since corn holds its shape and doesn't release much liquid the way a softer vegetable would — canned corn kernels, drained, weigh close to the same figure, though canning liquid itself adds meaningful extra weight if left undrained.
Sweet corn's sugars begin converting to starch almost immediately after picking, which is why corn eaten as close to harvest as possible tastes noticeably sweeter than corn that's traveled and sat for days — a genuine, fast-moving quality change rather than a spoilage concern.
How long does it last?
Storage & shelf life →
Frequently asked questions
Why does fresh corn lose sweetness so quickly after being picked?
The moment an ear of corn is picked, its natural sugars start converting into starch, which is the real reason behind the old advice to eat corn the day it comes off the stalk — newer sweet-corn varieties are bred to slow that conversion down, but it's still a faster decline than most vegetables experience after harvest.
Is frozen corn as good as fresh corn?
Often very close, and sometimes the better choice in practice — commercial freezing usually happens within hours of picking, well before the sugar-to-starch conversion has much chance to progress, unlike a "fresh" ear that may have already spent days in transit and storage before reaching a kitchen.
Why does fresh cut corn have such a short fridge life?
Once cut from the cob, corn kernels are exposed and continue their natural sugar-to-starch conversion and moisture loss quickly, giving fresh cut kernels just a 1-2 day window before quality and safety both start to decline.
Does canned corn weigh the same per cup as fresh or frozen corn?
Close, though canned corn's packing liquid can add some measured weight depending on how well it's drained — this site's 165g figure is calibrated to fresh or thawed frozen kernels rather than the canned product specifically.
Can I freeze fresh corn kernels myself instead of buying pre-frozen?
Yes, and blanching the kernels briefly before freezing (a quick boil followed by an ice bath) helps preserve their texture and color better than freezing them raw, similar to the blanching step recommended for other fresh vegetables on this site headed for the freezer.