Free ecology tools
The calculations you need for reports and species lists, as web tools with nothing to install and no sign-in. Everything runs in your browser, so unpublished survey data and protected-species locations are safe to use.
Diversity index calculator
Paste species and counts to get Shannon-Wiener H′ (ln, log₁₀ and log₂ side by side), Pielou evenness, Simpson and Margalef, per zone if you need it.
Table → indicesUTM and WGS84 coordinate converter
Convert between latitude/longitude and UTM anywhere in the world, one point or a whole column at once. The zone is picked for you, Norway and Svalbard exceptions included.
Coordinates → coordinatesPhoto location remover
Strip GPS and camera data from JPEG photos before you share them. Image quality and orientation stay the same, so sensitive species locations do not leak.
JPEG → JPEGPlant quadrat calculator
From DBH or girth to basal area per hectare, diameter classes, and relative density, dominance and frequency with the importance value (IVI).
Tree list → plot statistics
Why your data cannot leak
These tools are front-end only: once the page has loaded, every calculation happens on your computer. The site's Content Security Policy lets a page talk only to this site, so even a bug could not send your data to another server. The site uses no cookies, ads or trackers.
Results are for reference only; check formal reports against the applicable guidelines and contract requirements. See the terms of use.