If you are a student, a researcher on a budget, or a professional needing a quick second opinion on grain size data, is still the best starting point. It will work on your university lab computer, your old Windows laptop, and – with slight tweaks – even on modern systems.
Why? Because grain size analysis is fundamental. Whether you are analyzing beach sands, river sediments, glacial tills, or deep-sea cores, you need to convert raw sieve data and hydrometer measurements into meaningful statistical parameters: mean, sorting (standard deviation), skewness, and kurtosis. Gradistat v 9.1 does this efficiently, accurately, and—crucially—for free. gradistat v 91 free
The original website ( www.kpal.co.uk ) no longer hosts the software. The developers have retired or moved on. However, the software was released as freeware for academic and non-commercial use. No one currently holds exclusive distribution rights, but the original license remains in force. If you are a student, a researcher on
| | 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 | Because grain size analysis is fundamental
This article provides everything you need to know: what Gradistat v 9.1 is, its key features, how to get it legally for free, how it compares to modern alternatives, and a step-by-step guide to using it. Gradistat (Version 9.1) is a Microsoft Excel macro-enabled workbook developed by Simon J. Blott and Kenneth Pye of the now-closed Kenneth Pye Associates Ltd. (later part of Foster Wheeler). It was first introduced in the early 2000s and became the industry standard because it automated the tedious, error-prone process of calculating Folk and Ward (1957) graphical statistics, moments statistics, and the logarithmic method of moments.
Introduction: Why Gradistat Remains Indispensable In the world of sedimentology, geomorphology, and soil science, few software tools have achieved the legendary status of Gradistat . Specifically, Gradistat v 9.1 free remains one of the most widely searched and downloaded pieces of software in the geosciences, even years after its last official update.