). Ensure your sample data consists of the on each sieve, or the cumulative percentage passing . Step 2: Set Calculation Parameters
For those looking for even more modern functionality, a fully revised version known as is currently in development to offer greater functionality for modern research environments. GRADISTAT software - Kenneth Pye Associates Ltd
: 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
GRADISTAT (GRAin DIStribution and STATistics) is a software package designed for analyzing grain size statistics. It is particularly popular because it operates within Microsoft Excel, making it accessible to anyone with a basic understanding of spreadsheets.
GRADISTAT was developed by Simon J. Blott and Kenneth Pye, with its methodology and original software published in 2001 in the journal Earth Surface Processes and Landforms . The program was designed for the rapid analysis of grain size statistics from data obtained through standard measuring techniques like sieving and laser granulometry. Its integration into Microsoft Excel made it extremely versatile, accepting both standard and non-standard size data and producing key graphical outputs. gradistat v 91 free
GRADISTAT is designed to be user-friendly once you understand the basic data input requirements. Here is a general workflow based on the software's design:
This is a free, open-source, cross-platform script written in . It offers a number of advanced tools for characterizing grain size and the actual distribution of grain sizes, particularly from thin sections. Being Python-based, it is highly extensible and can be integrated into larger data analysis workflows.
GRADISTAT v9.1 Free: The Definitive Grain Size Analysis Tool
Manual calculation of these metrics across dozens of samples is incredibly time-consuming. GRADISTAT solves this problem by processing roughly , offering automated math for both standard sieve masses and modern laser granulometry outputs. Core Technical Features GRADISTAT software - Kenneth Pye Associates Ltd :
GRADISTAT will generate a "Summary Statistics" output, typically on a separate worksheet. This output includes all the calculated parameters (mean, sorting, skewness, kurtosis) in both metric and phi units, using both graphical and moment methods. You can then copy these results or save the entire workbook for your records.
Statistics are provided in both metric units (micrometers) and logarithmic phi units .
The software is generally available for free through academic and institutional repositories. Official Source Kenneth Pye Associates Ltd website provides links to the software. Version Compatibility Original Versions : Built for Excel 1997 and 2000. Version 8.0 : Compatible with Excel 2000 through 2010 (available in GRADISTAT-PRO
Runs as a macro-enabled spreadsheet natively inside Microsoft Excel. GRADISTAT was developed by Simon J
These metrics are calculated using both the Folk and Ward (1957) and Method of Moments techniques. Why Choose GRADISTAT v9.1?
The standard deviation, indicating the uniformity of the sample. Skewness: The asymmetry of the distribution curve.
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GRADISTAT is highly flexible, supporting various grain size analysis inputs: Handles multiple sieve sizes.