Change Product Image Size on Magento Category Grid/List Pages
If you are using the default phtml files for Magento, the image sizes for the products are the following:
Small image: 135x135px
Base image: 265x265px
And this what shows on the category pages. But if you are looking to have your own custom size for those category products listing page, then here is how to do it.
1. Open up your list.phtml file and edit this as per your size requirements :
2. You will need to modify your css as well.