Pest Scouting Calculator

Sample count from field size and method.

Field size (acres)

Desired precision (%)

Expected variability (CV%)

Total pests counted

Samples taken

Sample unit size (row-ft)

Tab to move between fields

Minimum samples needed

Samples sufficient? (1/0)0

Pests per sample2.4

Pests per unit2.4

Stop spacing (ft)206

Est. scouting time (hrs)2.6

How to Use This Calculator

How the result changes with Desired precision (%)

Field size (acres): Total field area to be scouted.
Desired precision (%): How close to the true mean you want to be (25% is standard).
Expected variability (CV%): Coefficient of variation of pest counts. 80% is typical for most pests.
Total pests counted: Sum of all pest counts across your scouting samples.
Samples taken: Number of sample points actually scouted.
Sample unit size (row-ft): Size of each sample unit (e.g., 1 row-foot, 1 plant, 1 sweep).

Minimum samples needed: Statistical minimum for reliable pest density estimation at 95% confidence.
Samples sufficient? (1/0): 1 = enough samples taken, 0 = need more samples.
Pests per sample: Average pest count per sampling point.
Pests per unit: Pest density per row-foot, plant, or sweep (your sample unit).
Stop spacing (ft): Distance between scouting stops for uniform field coverage.
Est. scouting time (hrs): Estimated time to complete scouting at 3 min/stop.

Identify Input Parameters
4 parameters
Field size (acres) = 40, Desired precision (%) = 25, Expected variability (CV%) = 80, Total pests counted = 24 = 6 input(s) provided
Calculate Minimum samples needed
Minimum samples needed = ceil((t * t * CV * CV) / (E * E))
41 = 41
Calculate Samples sufficient?
Samples sufficient?
0 = 0
Calculate Pests per sample
2.4 = 2.4