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Calcimator

NDVI Crop Health Calculator

Assess crop health from NIR and red band reflectance values to estimate NDVI and potential yield impact.

Inputs

acres
bu/ac
$

Results

NDVI Value

0.69

Health Assessment

Good

Yield Impact-5%
Adjusted Yield190 bu/ac
Yield Loss per Acre10 bu/ac
Total Revenue Loss$2,200.00
How to Use This Calculator
  1. Enter NIR Reflectance, Red Reflectance, and Affected Area.
  2. Set Expected Yield and Crop Price.
  3. Review NDVI Value and Health Assessment.
  4. Use Yield Impact (%) and Adjusted Yield (bu/ac) to inform your decision.
  5. Use the chart to visualize the results and explore different scenarios by adjusting inputs.

How the result changes with NIR Reflectance

NIR ReflectanceNDVI ValueHealth Assessment
0.10Bare Soil / Severe Stress
0.350.56Good
0.650.73Excellent
0.90.8Excellent

What each input means

NIR Reflectance
Near-infrared band reflectance value (0-1) from imagery.
Red Reflectance
Red band reflectance value (0-1) from imagery.
Affected Area
Acres represented by this NDVI reading.
Expected Yield
Normal yield for this crop and field.
Crop Price
Market price per bushel.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    NIR Reflectance = 0.55, Red Reflectance = 0.1, Affected Area = 40, Expected Yield = 200 = 5 input(s) provided
  2. Calculate NDVI Value
    NDVI Value
    0.692 = 0.692
  3. Calculate Health Assessment
    Good = Good
  4. Calculate Yield Impact
    -5 = -5%
  5. Calculate Adjusted Yield
    Adjusted Yield
    190 = 190

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