Void Ratio & Porosity Calculator
e, n and their interconversion — the soil phase diagram's first pair.
Sands live at e = 0.4–0.8; soft clays 1–2; organic soils beyond 3. The 1/3-void picture of typical sand is what makes hauling (bulking) and compaction math work.
Formula
Void Ratio & Porosity Calculator is a free void ratio 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 Void Ratio & Porosity Calculator
e, n and their interconversion — the soil phase diagram's first pair. The calculation implements e = G_s·γ_w/γ_d − 1; n = e/(1+e) (Soil mechanics phase relations — Terzaghi & Peck). Sands live at e = 0.4–0.8; soft clays 1–2; organic soils beyond 3. The 1/3-void picture of typical sand is what makes hauling (bulking) and compaction math work.
How to use Void Ratio & Porosity Calculator
- 1Enter Specific gravity G_s.
- 2Enter Dry unit weight in kN/m³.
- 3Read Void ratio e, Porosity n instantly — no submit button needed.
Why use Void Ratio & Porosity Calculator?
- ✓Implements the standard formula — e = G_s·γ_w/γ_d − 1; n = e/(1+e)
- ✓Reference cited on-page: Soil mechanics phase relations — Terzaghi & Peck
- ✓Live worked example: the substitution recomputes from your numbers
- ✓Runs entirely in your browser — nothing uploaded, free forever
Frequently asked questions
What formula does the Void Ratio & Porosity Calculator use?+
It computes e = G_s·γ_w/γ_d − 1; n = e/(1+e), per Soil mechanics phase relations — Terzaghi & Peck. 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?+
Sands live at e = 0.4–0.8; soft clays 1–2; organic soils beyond 3. The 1/3-void picture of typical sand is what makes hauling (bulking) and compaction math work.
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 Void Ratio & Porosity 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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