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Soil Relative Density Calculator

Classify a granular soil's compactness (loose to very dense) from its void ratio relative to its maximum and minimum possible void ratios.

Computed in your browser — nothing you enter is uploaded. Figures are presented for United States against IRC 2024, and every formula is cited under regulatory standards below.

Last verified 2026-08-26 · v1.0.0

Market
Imperial · sales tax

Relative density

62.5 %

High confidence

Classification: Medium dense.

With the figures above, the relative density comes to 62.5 %. This is calculated for United States and cites IRC 2024. Building in another market? Change the selector above so the units and code reference follow.

Preliminary estimate, not certified engineering. This tool produces an indicative quantity calculation for planning purposes only — it is not a certified structural analysis, a guaranteed material takeoff, or a substitute for building department approval. Always verify measurements on-site and have a licensed contractor or structural engineer review any load-bearing, code-sensitive, or safety-critical work before purchasing materials or starting construction. Spotted an arithmetic or standards error? Report it to contact@craftquantities.com with your inputs — confirmed fixes become pinned regression tests.

[Schema Verified] Computed in alignment with American Concrete Institute (ACI 318-19) formulas and International Residential Code (IRC 2024) spatial boundaries.

Regulatory standards & verification citations

  • Standard relative density formula: Dr = (emax − e) / (emax − emin) x 100%, where emax and emin are determined from standard maximum/minimum density lab tests (ASTM D4253/D4254)

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Frequently asked questions

What soil types is relative density used for?
It's specifically for granular (cohesionless) soils like sand and gravel — cohesive soils (clay) use different consistency measures (like liquidity index) since their behavior isn't governed the same way by packing density.
Why does relative density matter for construction?
It directly relates to bearing capacity, settlement behavior, and liquefaction susceptibility during earthquakes — denser sand is generally stronger, less compressible, and less prone to liquefaction than loose sand.
How do I get emax and emin values?
From standard laboratory tests (ASTM D4253 for maximum density/minimum void ratio, ASTM D4254 for minimum density/maximum void ratio) performed on a representative sample of your specific soil.