Calculators

Proctor Compaction Curve Tool

Updated September 5, 2026

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📊 Proctor Compaction Curve ASTM D698 / D1557 | AASHTO T99 / T180

Determine optimum moisture content (OMC) and maximum dry density from compaction test data. Includes AASHTO standards reference and PDF report export.

🏞️ Soil type preset

Loads typical compaction data

🧪 Compaction method

Higher energy → higher density, lower OMC

📌 Test points (moisture % , dry density pcf)

Enter at least 3–5 points for accurate curve

📐 Dry density (pcf) = wet density / (1 + moisture%/100). Curve fitted with 2nd‑order polynomial; OMC = vertex of parabola, max dry density = value at OMC. AASHTO T99/T180 equivalent to ASTM D698/D1557. Always verify with field density tests.

Compiled by the Reborn Rental team, backed by our field engineers and dispatch staff working Denver-metro concrete washout and equipment rental jobs.

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Proctor Compaction Curve Tool

📊 Proctor Compaction Curve ASTM D698 / D1557 | AASHTO T99 / T180