Field technician checking a core record
Calculate bulk density from a documented dry mass and actual sampled volume.
Enter dry mass, known volume and the matching lab value.
Sees a reproducible g/cm³ comparison.
Known-Volume Soil Bulk-Density Record Check
Reconcile oven-dry soil mass and known sampled volume with a laboratory bulk-density record and an external texture/plant threshold.
Use this result well
- Inputs that matter
- Oven-dry soil mass, known sampled volume, laboratory bulk density and a separately sourced texture/plant-specific threshold
- Output to expect
- Calculated bulk density plus signed comparisons with the laboratory record and entered threshold
- How it works
- Reconciles a known-volume record without assigning universal loose/moderate/compacted grades
- Verify sampling method, actual soil volume, horizon/depth, moisture state, coarse fragments, cracks/voids, drying basis and replication.
- Interpret with texture, structure, organic matter, plant/root objective, penetration resistance and qualified soil guidance before diagnosing compaction or treatment.
Choose your path
Built around the job you need to finish
Reconcile known-volume oven-dry bulk density with a laboratory record and external texture/plant threshold without a universal compaction grade.
Agronomist screening root restriction
Use a threshold matched to texture, horizon and crop/root objective.
Enter the external threshold and review sampling/replication context.
Does not apply a universal 1.3 or 1.6 cutoff.
Manager considering remediation
Avoid diagnosing or prescribing tillage from one sample.
Combine replicated density with moisture, structure, roots and penetration resistance.
Keeps treatment decisions outside the worksheet.
Authoritative checks for this tool
Outputs and checklists are planning aids. Review the linked current authorities and the records, terms, instructions, and requirements that apply to your exact situation before a consequential decision.
- Soil Survey Field and Laboratory Methods ManualUSDA Natural Resources Conservation Service · Official bulk-density sampling/method procedures and texture-dependent root-growth interpretation tables.
- Soil Quality Physical Indicator Information Sheet — Bulk DensityUSDA Natural Resources Conservation Service · Texture-dependent ideal, affecting and root-restricting bulk-density context rather than a universal threshold.
- Rangeland Soil Quality — CompactionUSDA Natural Resources Conservation Service · Official field context for moisture, texture, structure, organic matter, traffic and plant-specific root restriction.
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Reference & details
How it works
Updated August 2026
How it works
Updated August 2026Use a Valid Known Volume
Enter the oven-dry soil mass and actual sampled-soil volume from the documented core, clod, excavation, or other suitable method. Cracks, voids, coarse fragments, and shrinkage affect the basis.
Calculate Bulk Density
Calculated bulk density is oven-dry soil mass in grams divided by known sampled volume in cubic centimeters. The worksheet separately compares this value with the entered laboratory record.
Use a Matched External Threshold
Root-restriction interpretation varies by texture, horizon, structure, moisture, plant species, and objective. Enter a sourced threshold rather than applying one universal loose/compacted cutoff.
Updated: August 2026
Example Scenarios
Recompute one core or excavation record from its dry mass and documented soil volume.
Compare calculated and reported g/cm³ values to catch volume, drying, unit, or transcription differences.
Compare with a texture- and plant-specific external threshold while retaining the need for replicated field evidence.
Common Mistakes to Avoid
Common Mistakes to Avoid
Using nominal ring dimensions instead of sampled soil volume
Document the actual method and soil-filled volume, including trimming, shrinkage, cracks, voids, and coarse-fragment treatment.
Calling every value above 1.6 g/cm³ compacted
Thresholds vary substantially with texture and plant/root objective; review structure, moisture, penetration resistance, roots, and replication.
FAQ
Use the actual soil sample volume established by the documented bulk-density method, not merely a container's nominal capacity.
No. Interpret it with texture, structure, organic matter, moisture, roots, penetration resistance, traffic history, depth, and replicated samples.
NRCS guidance shows root-restricting values vary by soil texture, and actual restriction also depends on plant species and field context.
Follow the exact laboratory or field method. Whole-soil versus fine-earth treatment and fragment volume can materially change the result.
No. Treatment can be ineffective or damaging when diagnosis, depth, moisture, structure, traffic, and recovery processes are not established.
About Known-Volume Soil Bulk-Density Record Check
This worksheet checks known-volume bulk-density arithmetic against laboratory and externally sourced threshold records. It replaces universal compaction grades with traceable comparisons and explicit field-method limits.