Calculators

Proctor Compaction Curve Tool (Mold + Method)

Updated September 5, 2026

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

Determine OMC and max dry density from test points. Select compaction method, mold size, and procedure (A/B/C/D).

🏞️ Soil type preset

Loads typical compaction data

🧪 Compaction method

📏 Mold size

Typically 4" for fine, 6" for coarse soils

⚙️ Procedure (Method)

Standard Proctor: A, B, C

📌 Test points (moisture % , dry density pcf)

Enter at least 3–5 points for accurate curve

📐 Dry density = wet density / (1 + moisture/100). Polynomial curve fit yields OMC (vertex) and max dry density. Method A/B/C based on ASTM D698/D1557: A = 4" mold, #4 sieve; B = 6" mold, 3/8"; C = 6" mold, 3/4". Modified adds Method D for larger particles.

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 (Mold + Method)

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