rbridges.com homepage

Welcome to the cowry formula calculator

How to use

To start, click the "Add a specimen" button. Fill in the data for each category using numbers only (decimals are allowed). For each specimen that you want to include in the calculation just click the "Add a specimen" button for each and fill in the data. Once you have entered the data for all of your specimens click the "Calculate formula" button to see a table with all of the converted and calculated values as well as the final formula (this will open in a new page). From the calculation results page, please use your browser back button to return to this page if necessary.

**Note** The browser back button will only retain your original data entries when using the Firefox browser! Do not expect your data to be saved if using any other browser.

To learn more about the cowry formula please have a look at our article in Conchylia 43 (1-4).


Specimen ID Length (mm) Width (mm) Height (mm) Weight (grams) Labral teeth Columellar teeth