Kalle Remm Tiiu Kelviste Institute of Ecology and Earth Sciences, University of Tartu. 46 Vanemuise St., 51014 Tartu, Estonia Computational Ecology and Software ISSN 2220-721X http://www.iaees.org/publications/journals/ces/online-version.asp 2014 4 1 22 34 International Academy of Ecology and Environmental Sciences Hong Kong 6 December 2013 10 January 2014 1 March 2014 spatial statistics online tool habitat suitability autocorrelation spatio-temporal clustering An online calculator (http://digiarhiiv.ut.ee/kalkulaator/) for statistical analysis of spatial data is introduced. The calculator is applicable in a wide range of spatial research and for courses involving spatial data analysis. The present version of the calculator contains 35 web pages for statistical functions with several options and settings. The input data for most functions are pure Cartesian coordinates and variable values, which should be copied to the input cell on the page of a particular spatial operation. The source code for the computational part of all functions is freely available in C# programming language. Examples are given for thinning spatially dense observation points to a predefined minimum distance, for calculating spatial autocorrelations, for creating habitat suitability maps and for generalising movement data into spatio-temporal clusters. DOI 10.0000/issn-2220-721x-compuecol-2014-v4-0003 http://www.iaees.org/publications/journals/ces/articles/2014-4(1)/an-online-calculator-for-spatial-data.pdf