Crop Yield Estimator
Estimate harvested bushels per acre, total field tonnage, and gross crop revenue for corn, soybeans, wheat, and rice before harvest.
Calculate Crop Yield
Enter field acreage, plant population, and kernel counts to calculate pre-harvest yield estimates.
Calculation Results
Calculated using verified agricultural extension methodology: \text{Corn Yield (bu/acre)} = \frac{\text{Ears/Acre} \times \text{Rows} \times \text{Kernels/Row}}{85,000}
Quick Summary
The Crop Yield Estimator evaluates pre-harvest grain yield per acre ($\text{Yield}_{\text{bu/acre}} = \frac{\text{Ears/Acre} \times \text{Kernels/Ear}}{\text{Kernel Weight Factor}}$) for corn, soybeans, wheat, and rice based on land grant university extension field sampling standards.
Formula Explanation
\text{Corn Yield (bu/acre)} = \frac{\text{Ears/Acre} \times \text{Kernel Rows} \times \text{Kernels/Row}}{85,000}
\text{Soybean Yield (bu/acre)} = \frac{\text{Plants/Acre} \times \text{Pods/Plant} \times \text{Beans/Pod}}{150,000}
\text{Total Revenue} = \text{Total Bushels} \times \text{Market Price per Bushel}How It Works
The Crop Yield Estimator applies standardized yield component formulas developed by agricultural extension specialists (such as Purdue University and Iowa State Extension). By multiplying plant population per acre by average kernel/bean counts and dividing by seed weight factors, growers can estimate harvest volume 2–4 weeks prior to harvest for storage and contracting decisions.
Step-by-Step Worked Example
Practical Problem: A 100-acre corn field has 32,000 harvestable ears per acre. Sampling shows an average of 16 kernel rows per ear and 35 kernels per row. Estimated market price is $4.50/bushel. Calculate expected total yield and revenue.
- Step 1: Kernels per ear: $16 \times 35 = 560\text{ kernels per ear}$.
- Step 2: Total kernels per acre: $32,000 \times 560 = 17,920,000\text{ kernels/acre}$.
- Step 3: Yield per acre: $17,920,000 / 85,000 = \mathbf{210.8\text{ bushels/acre}}$.
- Step 4: Total field yield: $210.8 \times 100 = \mathbf{21,082\text{ bushels}}$ ($590\text{ short tons}$).
- Step 5: Gross revenue: $21,082 \times \$4.50 = \mathbf{\$94,871\text{ estimated revenue}}$.
Real-World Calculation Examples
Scenario 1: High-Yield Irrigated Corn
Parameters: 34,000 ears/acre, 18 rows, 38 kernels/row
Result: 273.6 bu/acre (27,360 bu per 100 acres). High-yield irrigated field.
Scenario 2: Dryland Soybean Field
Parameters: 120,000 plants/acre, 30 pods, 2.5 beans/pod
Result: 60.0 bu/acre (6,000 bu per 100 acres). Solid Midwest soybean yield.
Scenario 3: Winter Wheat Field
Parameters: 60 heads/sq.ft, 24 kernels/head
Result: 62.6 bu/acre (6,260 bu per 100 acres). Standard winter wheat yield.
Scenario 4: Drought-Stressed Corn
Parameters: 28,000 ears/acre, 14 rows, 28 kernels/row (95k factor)
Result: 115.6 bu/acre (11,560 bu per 100 acres). Drought stress yield impact.
Key Benefits of Using This Calculator
4 Major Crops Supported
Supports customized yield formulas for Corn, Soybeans, Wheat, and Rice.
Extension Yield Component Standards
Uses validated land grant university kernel weight factors (85,000 corn / 150,000 soybean factor).
Revenue & Tonnage Estimates
Outputs total harvest bushels, metric tons, kg/ha equivalent, and gross field revenue.
100% Free & Client-Side
Executes locally in your browser with zero latency or web server transmission.
Frequently Asked Questions (FAQ)
When is the best time to estimate corn yield in the field?
Corn yield estimation is most accurate at the milk/dough growth stage (R3 to R4), typically 2 to 3 weeks after silking when ear size and kernel count per ear are fixed.
What kernel weight factor should I use for corn yield estimation?
85,000 is standard for normal grain fill years. Use 90,000–95,000 for drought or stress years (smaller kernels) and 75,000–80,000 for exceptional grain fill conditions.
How many feet of row equal 1/1,000th of an acre for sampling?
For 30-inch row corn: 17 feet 5 inches equals 1/1,000th of an acre. Count harvestable ears in 17'5" and multiply by 1,000 for ears per acre.
What is a standard bushel weight for corn and soybeans?
Standard US bushel weights: Corn = 56 lbs/bu; Soybeans = 60 lbs/bu; Wheat = 60 lbs/bu; Rice = 45 lbs/bu.
How many bushels of corn are in a metric ton?
1 metric ton (1,000 kg or 2,204.6 lbs) of corn equals approximately 39.37 bushels (at 56 lbs/bushel).
How do I convert bushels per acre to kilograms per hectare (kg/ha)?
Multiply corn bu/acre by 62.77 to get kg/ha. Multiply soybean or wheat bu/acre by 67.25 to get kg/ha.
What is average corn yield per acre in the US?
The US national average corn yield ranges between 170 and 180 bushels per acre, with top irrigated fields exceeding 250–300 bu/acre.
How does test weight affect yield estimation?
Low test weight (under 54 lbs/bu for corn) means kernels are lighter, requiring a higher kernel factor (90,000+) to prevent overestimating bushels.
Can satellite imagery replace manual yield sampling?
NDVI satellite imagery measures canopy greenness and biomass, but ground truth sampling of ear kernel counts remains essential for precise bushel yield forecasting.
How many ears per acre should be sampled for an accurate field estimate?
Sample at least 5 representative locations per field, counting ears and kernel rows on 3 consecutive ears per location (15 ears total) for a reliable field average.