How Many Kernels Are on a Cob of Corn? 5 Facts Every Farmer Knows

An average cob of corn contains about 800 kernels arranged in 16 rows, though the total number of kernels on each ear of corn can range from 500 to 1,200 depending on variety, pollination, and growing conditions. This guide covers the math behind kernel counts, the factors that shift the number, and how to count kernels on any ear.

A typical cob of corn carries about 800 kernels in 16 rows, with roughly 50 kernels per row. Field corn usually holds 600 to 1,000 kernels per ear. Sweet corn averages 500 to 800 kernels. Popcorn runs lower, near 200 to 400 kernels.

What is a corn kernel?

A corn kernel is a single seed on the maize plant. Each kernel develops from one pollinated silk. The silk carries pollen to the ovule, and a successful pollination produces one kernel. An ear of corn is a dense cluster of these seeds on a single cob.

Each kernel has three parts: the pericarp (outer skin), the endosperm (starch), and the germ (embryo). The endosperm makes up most of the kernel’s weight.

How many kernels are on an average cob of corn?

An average cob carries about 800 kernels. Field corn often reaches 600 to 1,000 kernels per ear. Sweet corn ears usually hold 500 to 800 kernels.

The count depends on rows and kernels per row. Most ears have 14, 16, or 18 rows. Kernels per row typically run 30 to 50. Multiplying the two gives the total count for that ear.

Why do corn kernels grow in even rows?

Corn kernels grow in even-numbered rows because of genetics. The ear develops paired spikelets, and each pair creates two kernels side by side. This pattern locks the row count to even numbers like 12, 14, 16, 18, or 20.

You will not find an ear with 15 or 17 rows. The biology does not allow it.

How to count kernels on a cob of corn

Counting kernels takes five quick steps. Use a mature, fully filled ear for the best estimate.

1. Pick a dry ear. A fully developed ear gives an accurate count. Skip ears with large tip gaps.
2. Count the rows. Circle the cob at the middle and count each row. The number will be even.
3. Count one full row. Pick a straight row and count from base to tip. Include every kernel.
4. Multiply. Take rows × kernels per row.
5. Adjust for gaps. Subtract any missing or aborted kernels at the tip or base.

Example: 16 rows × 50 kernels = 800 kernels per ear.

What factors affect kernel count per ear?

Several field conditions set the final kernel number. I watch these closely during the growing season.

• Variety or hybrid genetics. Each hybrid has a set row range. Seed companies publish this data.
• Pollination weather. Heat above 95°F or drought during silking reduces kernel set. Silks dry out and miss pollen.
• Soil nitrogen. A nitrogen deficit during ear formation shrinks kernel numbers.
• Plant spacing. Crowded stands cut light and water per plant, which drops kernels per ear.
• Moisture at R1 stage. Corn needs steady water during silking. Drought stress at this stage aborts kernels.
• Pest and disease pressure. Corn borers, rootworm, and ear rot damage developing kernels.

If you want to lift your own farm output, I walked through the full playbook in my guide on steps to raise crop yields.

The Field corn vs sweet corn kernel counts

Field corn (dent corn) carries more kernels per ear than sweet corn. Field corn kernels are denser and the ears run longer. Sweet corn kernels are plumper with more water, so they fit fewer per row.

Corn type	Kernels per ear	Notes
Field (dent) corn	600 to 1,000	Feed, ethanol, meal
Sweet corn	500 to 800	Eaten fresh or frozen
Popcorn	200 to 400	Smaller ears, hard kernels
Flint corn	400 to 700	Used for polenta, flour

How kernel count connects to yield

Yield depends on three numbers: ears per acre, kernels per ear, and kernel weight. Iowa State University teaches the Yield Component Method, which multiplies these numbers and divides by 90,000 to estimate bushels per acre. You can read more on corn yield estimation at Iowa State Extension.

A single bushel of shelled corn weighs 56 pounds at 15.5% moisture. That figure ties straight to kernel count. I broke down the numbers further in my post on pounds per bushel of corn. If you handle corn in smaller containers, check my notes on a bucket of shelled corn.

How many kernels are in a pound of corn?

One pound of shelled field corn holds about 1,200 to 1,500 kernels. The exact number depends on kernel size. Larger hybrids count closer to 1,200 per pound. Smaller kernels hit 1,500 or more.

A 56-pound bushel contains roughly 70,000 to 80,000 kernels. That number is useful for seed rate planning and feed ration math.

Common mistakes when counting corn kernels

Avoid these errors for a cleaner count:

• Counting an immature or tip-back ear. The number runs low.
• Skipping aborted kernels at the tip. They still count as potential yield loss.
• Counting rows near the base. Use the middle of the ear where rows are straight.
• Comparing across varieties. Each hybrid has its own range.
• Forgetting moisture. Shelled corn weight only matches 56 pounds per bushel at 15.5% moisture.

When to count kernels on your crop

Count kernels near harvest, after the milk line has set and the ear has dried. I covered timing in my article on knowing when crops are ready to harvest. At R6 (physiological maturity), the kernel count is final. For pre-harvest yield checks, use the Yield Component Method two to three weeks before harvest. Guidance from UNL CropWatch supports this timing.

FAQs about Kernels on a Cob of Corn

Conclusion

An average cob of corn carries about 800 kernels in 16 rows, with a realistic range of 500 to 1,200 per ear. The final count depends on genetics, pollination, and field conditions. Count your own ears at maturity for the most accurate yield check. The math stays simple: rows × kernels per row, adjusted for tip-back.