Gradistat V 91 [verified] - Free
Automatically generates frequency distribution curves and cumulative weight percent curves directly inside Excel worksheets.
: Calculates granular trends using both the traditional Method of Moments and the highly robust, graphically-rooted Folk and Ward (1957) mathematical models .
The original version, which many still use today, was written for Microsoft Excel 97 and 2000. An updated version, 8.0, was released in December 2010, extending compatibility to Excel versions up to 2010. Version 9.1 represents a subsequent iteration, which, according to scientific literature, has been used in various studies for grain size analysis.
: Produces frequency and ternary plots (e.g., Gravel-Sand-Mud) within Excel. Harvard University Where to Find It gradistat v 91 free
: Calculations are based on standard moment and Folk and Ward graphical methods .
This article explores the features, applications, and availability of this powerful Excel-based tool as of 2026. What is GRADISTAT v9.1?
I’m sharing a quick update that is available as a free download. It remains one of the most efficient tools for calculating standard statistics (mean, sorting, skewness, kurtosis) using both the Method of Moments and the Folk and Ward graphical methods. Key Features of v9.1: An updated version, 8
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.
). Ensure your sample data consists of the on each sieve, or the cumulative percentage passing . Step 2: Set Calculation Parameters
GRADISTAT was originally developed by Simon Blott. You can download the latest version for free from various academic and research repositories, most notably: Harvard University Where to Find It : Calculations
A: This is almost always due to one of two issues. First, ensure you have enabled macros in your Excel security settings. Second, check that your data is in the correct format (e.g., the first column contains sieve sizes in descending order) and that there are no empty rows or columns interfering with the input range.
The application accepts particle size distributions from standard or non-standard testing techniques and processes data with exceptional efficiency. The key quantitative and descriptive metrics generated by the software include:
Choose your preferred statistical methods from the options panel. You can select whether you want the calculations to output in metric or Phi units, and choose between the Folk and Ward or Method of Moments frameworks. Step 3: Run the Program