Gradistat V91 is an older Windows utility for analyzing and processing granulometry data, widely used in geology, sedimentology, and civil engineering for grain-size distribution, statistical parameters (mean, median, sorting), and plotting cumulative and frequency curves.
GradiStat v9.1 Free is a no-frills, deterministic tool designed for one thing: univariate gradient analysis (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.
Best for explaining the value to students or peers.
Title: 🛑 Stop calculating grain size stats by hand! Gradistat v9.1 (Free) is here.
Body: Hey everyone,
If you are working on your thesis or a research project involving sediment analysis, checking out Gradistat v9.1 is a must.
It’s a spreadsheet-based tool (developed by Simon Blott) that calculates standard grain size statistics using the method of moments and the Folk and Ward method. It saves hours of work by automatically generating cumulative curves and statistical outputs.
It is totally free for non-commercial use.
Key features in v9.1:
Link: [Insert Link Here]
Hope this helps save some time during crunch week!
Gradistat v 9.1 is free, but it has limitations: no 64-bit Excel support, no automatic batch processing, and it can be unstable on modern Windows 11 with newer Excel. Here is how it stacks up:
| Feature | Gradistat 9.1 Free | Gradistat (commercial successor) | GSlope | R package ‘G2Sd’ | | --- | --- | --- | --- | --- | | Price | Free | Paid (~$100-200) | Free | Free | | GUI | Excel-based | Standalone | Standalone | Command-line | | Batch processing | No | Yes | Yes | Yes | | Hydrometer support | Yes | Yes | No | Limited | | Modern OS support | Partial (Windows only) | Full | Full | Cross-platform | | Learning curve | Low | Low | Medium | High | gradistat v 91 free
Verdict: Gradistat 9.1 remains best for students, quick analyses, and legacy data compatibility. For large-scale research (>100 samples), consider a modern tool.
Fix: This is a reference error. Open VBA editor (Alt+F11), go to Tools → References, and uncheck any missing "MISSING:" libraries.
Fix: The macro is optimized for up to 200 individual grain size fractions. For higher-resolution data (e.g., laser diffraction), reduce the number of bins or use a different program like GRADISTAT_2014 (a community optimized version).