Active Carbon Calculator

Permanganate-oxidizable carbon (POXC) from soil sample absorbance readings using the Weil et al. method.

Sample absorbance (550 nm)

Blank absorbance (550 nm)

Soil weight (g)

KMnO4 solution volume (mL)

Tab to move between fields

POXC (mg C/kg soil)

540

KMnO4 consumed (%)37.5%

Active C fraction (%)3.5%

Soil health score (0-100)45

RatingModerate

How to Use This Calculator

Enter your soil active carbon measurement from a permanganate oxidizable carbon (POXC) test in mg/kg.
Input your soil texture class (sand, loam, clay) to set the reference baseline.
Set your land use type (cropland, pasture, forest).
Review the Active Carbon Score and the Biological Activity Rating.
Use the Management Recommendations output to prioritize cover crops or compost additions.

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