Compaction Density Calculator

Check compaction density from simple field measurements. Compute wet density, dry density, and relative compaction. Download reports for inspectors, crews, and quality records fast.

Inputs

Add up to 6 field tests and compute densities instantly.
%
Requires maximum dry density to check Pass/Fail.
Wet and dry density display uses this unit.
Use the lab value from your density test standard.
Sample 1
Measured mass of moist soil in the mold.
Use the calibrated mold volume.
%
Oven-dry moisture percentage (w).
Tip: Keep units consistent across all samples.\n For relative compaction, provide maximum dry density.\n Use Target RC to auto-check Pass/Fail.\n
Reset saved results

Example data table

These examples use kg, m³, and kg/m³ for display.

Sample Moist mass (kg) Mold volume (m³) Moisture (%) Wet density (kg/m³) Dry density (kg/m³) Relative compaction (%)
Example A 4.250 0.002125 11.50 2000.000 1793.722 96.98 (MDD 1849)
Example B 4.120 0.002125 9.80 1938.824 1765.049 95.44 (MDD 1849)
Example C 4.300 0.002125 13.20 2023.529 1787.124 96.63 (MDD 1849)

Replace the example values with your own field measurements.

Formula used

Wet density
ρwet = m / V
m is the moist soil mass in the mold, and V is mold volume.
Dry density
ρdry = ρwet / (1 + w)
w is moisture content as a decimal (e.g., 11.5% → 0.115).
Unit weight
γ = ρwet · g
Displayed in kN/m³ using g = 9.80665 m/s².
Relative compaction
RC(%) = (ρdry / MDD) · 100
MDD is the maximum dry density from your lab compaction curve.

How to use this calculator

  1. Select your mass, volume, and output density units.
  2. Enter mold volume from calibration records.
  3. Enter moist soil mass measured for each field test.
  4. Enter moisture content from your moisture test.
  5. Optionally enter MDD and a target compaction percentage.
  6. Press Submit to view results and export reports.

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Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.

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