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Concrete Relative Yield Calculator (ASTM C138)

Check whether a concrete batch actually produced its designed volume, per ASTM C138's relative yield check.

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 2026-08-27 · v1.1.0

Market
Imperial · sales tax

Relative yield

1.02 (ratio, target 1.0)

Check your inputs

The batch produced MORE volume than designed — the mix may be under-yielding on materials relative to the design, or air content is higher than assumed.

Actual yield
1.34 yd³

For the dimensions entered, expect a relative yield of 1.02 (ratio, target 1.0). Note that total batch mass and design batch volume sit at the edge of the range this calculator was checked against, so treat the output as indicative rather than settled. Moderate confidence — sound arithmetic, but allow for the variation any real site introduces. Set for United States against IRC 2024. The market selector changes both the units and the code cited.

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

  • ASTM C138 relative yield: actual yield = total batch mass / measured unit weight; relative yield = actual yield / design volume (should be close to 1.0)

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Frequently asked questions

Why would a batch's actual yield differ from its design volume?
Aggregate moisture content, entrained air, and small batching inaccuracies all shift the real volume a fixed mass of ingredients produces — relative yield catches this directly instead of relying on assumptions.
What if my relative yield is consistently off?
A consistent bias (always high or always low) suggests a systematic issue — recheck aggregate moisture testing, scale calibration, or air content — rather than a one-off measurement error.
Does under-yield mean I'm wasting material?
The opposite — under-yield means the batch produced LESS volume than planned for the same material cost, so you'll need more batches (and more total material) to finish the same job than budgeted.