What is the kernel factor for corn?

The standard kernel factor is 90 (meaning ~90,000 kernels per bushel at 15.5% moisture). This can range from 75 to 105 depending on kernel size: smaller kernels use a higher factor, larger kernels use a lower factor.

How does moisture affect corn yield?

Corn is priced at 15.5% standard moisture. Wetter corn weighs more but contains more water. The adjustment formula is: Adjusted yield = Measured yield x (100 - actual moisture) / (100 - 15.5). Corn harvested at 20% moisture will show about 5% lower dry yield.

How many rows of kernels does an ear of corn have?

Most hybrid corn ears have 14-18 rows of kernels, with 16 being the most common. Each row typically has 25-40 kernels, giving 400-640 kernels per ear.

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How to Estimate Corn Yield

Estimating corn yield before harvest helps farmers plan grain storage, marketing, and logistics. This calculator offers two proven methods:

Method 1: Ear Count (Field Method)

The ear count method is the most widely used pre-harvest estimation technique. Walk into the field, measure a sample area, count ears, and count kernels per ear. The calculator converts your counts to bushels per acre.

The Formula

bu/ac = (Ears per acre × Kernels per ear) ÷ 90,000

The 90,000 kernel factor represents approximately how many kernels fill one 56-pound bushel at 15.5% moisture.

Sampling Tips

Sample at least 3–5 spots across the field and average
Avoid field edges, waterways, and end rows
At 30-inch rows, 17.4 feet of row = 1/1,000th of an acre
Count all ears, including small or partially filled ones
For kernels: count rows around the ear × kernels per row (e.g. 16 × 32 = 512)

Method 2: Model Estimation

The model method uses agronomic factors to predict yield based on corn variety, soil type, irrigation, climate, planting density, rainfall, and fertilizer application. This is useful for pre-season planning or when you can't do a field count.

Moisture Adjustment

US corn is marketed at a standard 15.5% moisture basis. If your corn is wetter (e.g. 20% at harvest), the calculator automatically adjusts yield downward to the dry-weight equivalent. The formula is:

Adjusted bu/ac = Measured bu/ac × (100 − actual%) ÷ 84.5

US Corn Yield Benchmarks

Region	Avg Yield (bu/ac)	Notes
US National Average	175–180	2023–2025 USDA average
Iowa / Illinois	200–220	Core Corn Belt
Nebraska (irrigated)	210–230	Center-pivot irrigation
Southern US	140–170	Heat stress, variable rain
Contest winners	600+	NCGA yield contest records

Frequently Asked Questions

How do you estimate corn yield before harvest?

The most common method is the ear count method: count ears in a 1/1000th-acre sample and average kernels per ear, then divide by 90,000 to get bushels per acre at 15.5% moisture.

What is the kernel factor?

The kernel factor (typically 90, meaning 90,000) represents how many kernels fill one bushel. It ranges from 75 (very large kernels) to 105 (small kernels). Use 90 if unsure.

What is a good corn yield per acre?

The US average is ~177 bu/ac. Yields above 200 bu/ac are considered excellent. Top Corn Belt fields regularly exceed 220 bu/ac.

Why does moisture matter for yield?

Corn is priced at 15.5% standard moisture. Wetter corn weighs more but contains more water. Elevators dock payment for excess moisture, so yield is always expressed at the standard basis.

How many samples should I take?

Take at least 3-5 samples in representative areas of the field. Avoid edges, waterways, and end rows. More samples = more accurate estimate.

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