Corn Yield Calculator
Free Corn yield Calculator for gardening & crops. Enter variables to compute results with formulas and detailed steps.
Formula
Yield (bu/acre) = (Ears per Acre x Kernels per Ear) / 90,000
This formula estimates corn yield by multiplying the total ears per acre by the average number of kernels per ear to get total kernels per acre, then dividing by 90,000 (the approximate number of kernels in one 56-pound bushel of corn at 15.5% moisture). The ear count is determined by counting ears in a known fraction of an acre and scaling up.
Worked Examples
Example 1: Average Corn Belt Field
Problem: A field with 30-inch rows has 33 ears per 1/1000th acre row length (17.4 ft). Average ear has 16 rows x 35 kernels = 560 kernels. Corn price: $5.50/bu.
Solution: Ears per acre: 33 x 1,000 = 33,000\nKernels per ear: 16 rows x 35 kernels = 560\nTotal kernels per acre: 33,000 x 560 = 18,480,000\nBushels per acre: 18,480,000 / 90,000 = 205.3 bu/acre\nWeight: 205.3 x 56 = 11,499 lbs/acre\nRevenue: 205.3 x $5.50 = $1,129.33/acre
Result: Yield: 205.3 bu/acre | Revenue: $1,129.33/acre | Rating: Excellent
Example 2: Drought-Stressed Field
Problem: Drought reduced stand to 26 ears per 1/1000th acre. Ears average 14 rows x 28 kernels = 392 kernels due to tip-back. Corn price: $5.50/bu.
Solution: Ears per acre: 26 x 1,000 = 26,000\nKernels per ear: 14 x 28 = 392\nTotal kernels per acre: 26,000 x 392 = 10,192,000\nBushels per acre: 10,192,000 / 90,000 = 113.2 bu/acre\nWeight: 113.2 x 56 = 6,341 lbs/acre\nRevenue: 113.2 x $5.50 = $622.84/acre
Result: Yield: 113.2 bu/acre | Revenue: $622.84/acre | Rating: Below Average
Frequently Asked Questions
How do you estimate corn yield before harvest?
The most common pre-harvest yield estimation method is the kernel count method. Walk into the field and select a representative area. Count the number of harvestable ears in a length of row (typically 1/1000th of an acre). Then pick several representative ears and count the number of kernel rows around the ear and the number of kernels per row, multiplying these together for kernels per ear. Divide total kernels per acre by 90,000 (the approximate number of kernels per bushel) to estimate bushels per acre. This method is accurate to within 10-15% of actual harvested yield when done carefully.
What is a good corn yield per acre?
Average U.S. corn yields are approximately 175-180 bushels per acre as of recent years, though this varies enormously by region, soil, weather, and management. Top producers in the Corn Belt (Iowa, Illinois, Indiana) regularly achieve 200-250 bushels per acre. The national corn yield contest record exceeds 600 bushels per acre under ideal conditions. Below 120 bushels per acre is generally considered below average and may indicate drought stress, pest damage, or fertility issues. Many factors affect yield including hybrid selection, planting date, plant population, fertility, and rainfall distribution during pollination.
How many kernels are in a bushel of corn?
A bushel of corn (56 pounds at 15.5% moisture) typically contains approximately 80,000 to 100,000 kernels, with 90,000 being the most commonly used estimate for yield calculations. This number varies based on kernel size and weight, which are influenced by hybrid genetics, growing conditions, and grain fill duration. In stress years with smaller kernels, there may be more than 100,000 kernels per bushel. In excellent years with large, dense kernels, the count may drop to 75,000-80,000. Some agronomists adjust the kernel factor based on observed kernel size to improve yield estimation accuracy.
How does row spacing affect corn yield?
Standard corn row spacing in the U.S. is 30 inches, though many farmers are moving to narrower 20-inch or even 15-inch rows. Narrower rows can increase yield by 5-10% because plants intercept more sunlight earlier in the season and compete more effectively against weeds. However, narrower rows require different planting and harvesting equipment. The yield advantage of narrow rows is most consistent at higher plant populations (above 34,000 plants per acre) and in northern latitudes where the growing season is shorter. At lower populations, row spacing has minimal impact on yield.
What is APY vs APR in crypto yield?
APR is the simple annual rate without compounding. APY includes the effect of compounding. A 10% APR compounded daily equals roughly 10.52% APY. Always compare APY to APY for accurate yield comparisons.
How do I get the most accurate result?
Enter values as precisely as possible using the correct units for each field. Check that you have selected the right unit (e.g. kilograms vs pounds, meters vs feet) before calculating. Rounding inputs early can reduce output precision.