Relative Compaction Calculator
Field density as % of Proctor maximum — the pass/fail of earthworks.
95% Standard Proctor is the embankment default; 98–100% Modified under pavements. Those last few percent matter exponentially — settlement potential roughly halves per point gained.
Formula
Relative Compaction Calculator is a free relative compaction for geotechnical engineers and foundation designers — instant, accurate and 100% client-side, with the governing formula and reference shown next to the result so the number can be defended, not just quoted.
About Relative Compaction Calculator
Field density as % of Proctor maximum — the pass/fail of earthworks. The calculation implements RC = γ_d,field/γ_d,max × 100 (IS 2720-7/8; ASTM D698/D1557). 95% Standard Proctor is the embankment default; 98–100% Modified under pavements. Those last few percent matter exponentially — settlement potential roughly halves per point gained.
How to use Relative Compaction Calculator
- 1Enter Field dry density in kN/m³.
- 2Enter Lab Proctor maximum in kN/m³.
- 3Enter Specified minimum in %.
- 4Read Relative compaction instantly — no submit button needed.
Why use Relative Compaction Calculator?
- ✓Implements the standard formula — RC = γ_d,field/γ_d,max × 100
- ✓Reference cited on-page: IS 2720-7/8; ASTM D698/D1557
- ✓Live worked example: the substitution recomputes from your numbers
- ✓Built-in engineering verdict flags out-of-range results instantly
- ✓Runs entirely in your browser — nothing uploaded, free forever
Frequently asked questions
What formula does the Relative Compaction Calculator use?+
It computes RC = γ_d,field/γ_d,max × 100, per IS 2720-7/8; ASTM D698/D1557. The formula is displayed under the result along with a worked example substituted with your own inputs.
What should I keep in mind when using this calculator?+
95% Standard Proctor is the embankment default; 98–100% Modified under pavements. Those last few percent matter exponentially — settlement potential roughly halves per point gained.
Can this replace a soil investigation?+
No calculator replaces boreholes and lab tests — but with investigated parameters in hand, this gives you the standard-method result instantly, with the formula shown so reviewers can check it.
Is the Relative Compaction Calculator free to use?+
Yes — completely free, no sign-up, no limits. It runs client-side in your browser, so inputs stay private and results are instant even on slow connections.
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