Soil Health Scorecard Calculator

Generate a composite soil health score from organic matter, aggregate stability, respiration, pH, and active carbon indicators.

Organic matter (%)

Aggregate stability (%)

Soil respiration (mg CO2-C/g/day)

Soil pH

Active carbon / POXC (mg/kg)

Tab to move between fields

Total health score (0-100)

Organic matter score (/20)13

Aggregate stability score (/20)13

Respiration score (/20)13.6

pH score (/20)20

Active carbon score (/20)12

GradeB

Weakest IndicatorActive Carbon

Weakest Score12

RecommendationIncrease labile carbon with cover crops and diverse residues.

How to Use This Calculator

Enter values for each soil health indicator: organic matter %, active carbon, aggregate stability, infiltration rate, and earthworm count.
Select your soil texture class to apply texture-adjusted scoring.
Review the score for each indicator on a 0-100 scale.
Check the Overall Soil Health Score and the letter grade assigned.
Focus management improvements on indicators scored below 60 for the greatest agronomic return.

How the result changes with Organic matter (%)

Organic matter (%): Soil organic matter from standard soil test (loss on ignition or Walkley-Black).
Aggregate stability (%): Percent water-stable aggregates from wet-sieving test.
Soil respiration (mg CO2-C/g/day): CO2 burst from 24-hour Solvita or incubation test.
Soil pH: Soil pH from 1:1 water method (optimum 6.0-7.0 for most crops).
Active carbon / POXC (mg/kg): Permanganate-oxidizable carbon from lab analysis.

Total health score (0-100): Composite score across all five indicators (20 points each).
Organic matter score (/20): Sub-score for soil organic matter.
Aggregate stability score (/20): Sub-score for physical soil structure.
Respiration score (/20): Sub-score for biological activity.
pH score (/20): Sub-score for soil acidity/alkalinity.
Active carbon score (/20): Sub-score for labile organic carbon pool.

Identify Input Parameters
4 parameters
Organic matter (%) = 3, Aggregate stability (%) = 45, Soil respiration (mg CO2-C/g/day) = 0.8, Soil pH = 6.5 = 5 input(s) provided
Calculate Total health score
Total health score
72 = 72
Calculate Organic matter score
Organic matter score
13 = 13
Calculate Aggregate stability score
Aggregate stability score
13 = 13