Engineering & geotechnics
Grain-Size Analysis
Sieve data to gradation curve, USCS class and Folk & Ward statistics.
Turns sieve masses into a particle-size distribution curve, reads D10, D30 and D60, computes uniformity and curvature coefficients, classifies the soil with USCS, and gives Folk & Ward graphic statistics for sedimentology.
Overview
Start from the standard ASTM sieve stack or your own sizes, enter the mass retained on each, and the curve, fractions and class update as you type. Atterberg limits can be added for fine-grained and dual classes.
What you enter · What you get
What you enter
- Sieve openings (mm) and mass retained (g)
- Total dry mass
- LL and PL for fines (optional)
What you get
- Gradation curve on a log scale
- Gravel, sand and fines percentages
- D10, D30, D60, Cu, Cc
- USCS group symbol and name
- Folk & Ward mean, sorting, skewness, kurtosis
How it works in the field
Enter sieve masses
Read the curve
Classify and export
Method and equations
Gradation coefficients
Cu = D60/D10 · Cc = D30² / (D10·D60)
Folk & Ward (1957)
Graphic measures on the phi scale, φ = −log₂ d(mm).
Mz = (φ16+φ50+φ84)/3 · σI = (φ84−φ16)/4 + (φ95−φ5)/6.6
Who uses it
Soil and materials laboratoriesSedimentologistsQuarry and aggregate engineers
Standards and references
- ASTM D6913/D6913M-17. Standard Test Methods for Particle-Size Distribution (Gradation) of Soils Using Sieve Analysis.
- ASTM D2487-17. Unified Soil Classification System.
- Folk, R.L. & Ward, W.C. (1957). Brazos River bar: a study in the significance of grain size parameters. JSP, 27(1), 3–26.
- Blott, S.J. & Pye, K. (2001). GRADISTAT. Earth Surface Processes and Landforms, 26, 1237–1248.
Results support professional judgement. They do not replace a licensed engineer’s or geologist’s sign-off.
At a glance
- Category
- Engineering & geotechnics
- Runs on
- Phone, tablet and desktop browser
- Export
- PDF report, PNG chart, CSV
- Access
- Subscribers
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