Gradistat V 91 Free Extra Quality – Official & Original

Accepts phi or mm intervals, and allows up to 100 size classes. Data can be entered manually or imported from spreadsheets.

GradiStat v9.1 Free is a no-frills, deterministic tool designed for one thing: (specifically, calculating the statistical optimum and tolerance of species along an environmental gradient). If you are a paleontologist or ecologist needing to replicate a 1990s transfer function, this is gold. If you expect graphs, intuitive data handling, or any support for multivariate analysis, look elsewhere.

Automatically assigns standard linguistic terms to sediment mix types, such as "Slightly Gravelly Muddy Sand," using the classic Folk (1954) classification triangle.

: Accepts weight retained on sieves or percentage sediment detected in size classes from laser granulometers, sedigraphs, or Coulter counters. Version Information v4.0 : The original version published in 2001.

Gradistat v 9.1 provides a comprehensive suite of statistical outputs based on both the Folk and Ward method and the Method of Moments. When you process your data, the software automatically generates: gradistat v 91 free

. While many users search for a "v9.1," the current official versions supported by the original developers are Version 8.0 and the newer GRADISTAT-PRO Kenneth Pye Associates Ltd Official Downloads and Availability

Click the calculation button to generate statistics.

GradiStat is a grain size distribution and statistics package specifically designed for the analysis of unconsolidated sediments. It was developed by Simon J. Blott and Kenneth Pye and was officially published in the journal Earth Surface Processes and Landforms in 2001.

In conclusion, Gradistat v91 serves as a testament to the value of specialized, accessible scientific software. By offering powerful granulometric analysis within a familiar spreadsheet interface, it lowered the barrier to entry for high-level sedimentology. The continued interest in accessing this specific version for free underscores the research community's reliance on standardized, cost-effective tools. Whether used for teaching the basics of sediment statistics or for processing complex environmental samples, Gradistat v91 remains a relevant milestone in the digitization of geological analysis. Accepts phi or mm intervals, and allows up

Since Gradistat runs on VBA, you must "Enable Content" when opening the file in Excel.

You can typically find the software and instructions on the website or via academic repositories:

If you are looking for specific guidance on setting up your data, I can: Explain how to format sieve data for the input sheet.

The program will generate a new sheet named Summary . This table displays the sample name, mean grain size, sorting classification (e.g., Well Sorted, Moderately Sorted), skewness, kurtosis, and the precise Folk textural description for every sample in your batch. If you are a paleontologist or ecologist needing

sizes, which are critical for determining soil hydraulic conductivity and structural engineering metrics.

Perhaps the most direct evolution of GRADISTAT, is an R package that provides comprehensive descriptive statistics and physical descriptions of sediment based on grain-size distribution data. It is the modern, open-source successor that builds upon the same principles. G2Sd also includes a powerful Shiny web application for an intuitive graphical interface, making it accessible even to those new to R programming.

Written originally by Dr. Simon J. Blott and published alongside Professor Kenneth Pye, this tool has become a foundational standard in geomorphology, geology, and environmental science. By running seamlessly inside standard spreadsheet software, it eliminates the need for expensive, proprietary statistical software while providing publication-ready charts and sediment classification data. What is GRADISTAT and Why is it Used?

Allows users to input and analyze dozens of samples simultaneously, saving hours compared to manual plotting on semi-logarithmic paper. System Requirements and Compatibility

: Automatically solves for physical sample properties including Mean, Mode, Sorting (Standard Deviation), Skewness, and Kurtosis . Percentile Identifiers : Extracts key marker markers such as D10cap D sub 10 D50cap D sub 50 (Median), and D90cap D sub 90